opengl.cpp
#include "HalideRuntimeOpenGL.h"
#include "device_interface.h"
#include "printer.h"
#include "mini_opengl.h"
// This constant is used to indicate that the application will take
// responsibility for binding the output render target before calling the
// Halide function.
#define HALIDE_OPENGL_RENDER_TARGET ((uint64_t)-1)
// Implementation note: all function that directly or indirectly access the
// runtime state in halide_opengl_state must be declared as WEAK, otherwise
// the behavior at runtime is undefined.
// List of all OpenGL functions used by the runtime. The list is used to
// declare and initialize the dispatch table in OpenGLState below.
#define USED_GL_FUNCTIONS \
GLFUNC(PFNGLDELETETEXTURESPROC, DeleteTextures); \
GLFUNC(PFNGLGENTEXTURESPROC, GenTextures); \
GLFUNC(PFNGLBINDTEXTUREPROC, BindTexture); \
GLFUNC(PFNGLGETERRORPROC, GetError); \
GLFUNC(PFNGLVIEWPORTPROC, Viewport); \
GLFUNC(PFNGLGENBUFFERSPROC, GenBuffers); \
GLFUNC(PFNGLDELETEBUFFERSPROC, DeleteBuffers); \
GLFUNC(PFNGLBINDBUFFERPROC, BindBuffer); \
GLFUNC(PFNGLBUFFERDATAPROC, BufferData); \
GLFUNC(PFNGLTEXPARAMETERIPROC, TexParameteri); \
GLFUNC(PFNGLTEXIMAGE2DPROC, TexImage2D); \
GLFUNC(PFNGLTEXSUBIMAGE2DPROC, TexSubImage2D); \
GLFUNC(PFNGLDISABLEPROC, Disable); \
GLFUNC(PFNGLDISABLEPROC, Enable); \
GLFUNC(PFNGLCREATESHADERPROC, CreateShader); \
GLFUNC(PFNGLACTIVETEXTUREPROC, ActiveTexture); \
GLFUNC(PFNGLSHADERSOURCEPROC, ShaderSource); \
GLFUNC(PFNGLCOMPILESHADERPROC, CompileShader); \
GLFUNC(PFNGLGETSHADERIVPROC, GetShaderiv); \
GLFUNC(PFNGLGETSHADERINFOLOGPROC, GetShaderInfoLog); \
GLFUNC(PFNGLDELETESHADERPROC, DeleteShader); \
GLFUNC(PFNGLCREATEPROGRAMPROC, CreateProgram); \
GLFUNC(PFNGLATTACHSHADERPROC, AttachShader); \
GLFUNC(PFNGLLINKPROGRAMPROC, LinkProgram); \
GLFUNC(PFNGLGETPROGRAMIVPROC, GetProgramiv); \
GLFUNC(PFNGLGETPROGRAMINFOLOGPROC, GetProgramInfoLog); \
GLFUNC(PFNGLUSEPROGRAMPROC, UseProgram); \
GLFUNC(PFNGLDELETEPROGRAMPROC, DeleteProgram); \
GLFUNC(PFNGLGETUNIFORMLOCATIONPROC, GetUniformLocation); \
GLFUNC(PFNGLUNIFORM1IVPROC, Uniform1iv); \
GLFUNC(PFNGLUNIFORM2IVPROC, Uniform2iv); \
GLFUNC(PFNGLUNIFORM2IVPROC, Uniform4iv); \
GLFUNC(PFNGLUNIFORM1FVPROC, Uniform1fv); \
GLFUNC(PFNGLUNIFORM1FVPROC, Uniform4fv); \
GLFUNC(PFNGLGENFRAMEBUFFERSPROC, GenFramebuffers); \
GLFUNC(PFNGLDELETEFRAMEBUFFERSPROC, DeleteFramebuffers); \
GLFUNC(PFNGLCHECKFRAMEBUFFERSTATUSPROC, CheckFramebufferStatus); \
GLFUNC(PFNGLBINDFRAMEBUFFERPROC, BindFramebuffer); \
GLFUNC(PFNGLFRAMEBUFFERTEXTURE2DPROC, FramebufferTexture2D); \
GLFUNC(PFNGLGETATTRIBLOCATIONPROC, GetAttribLocation); \
GLFUNC(PFNGLVERTEXATTRIBPOINTERPROC, VertexAttribPointer); \
GLFUNC(PFNGLDRAWELEMENTSPROC, DrawElements); \
GLFUNC(PFNGLENABLEVERTEXATTRIBARRAYPROC, EnableVertexAttribArray); \
GLFUNC(PFNGLDISABLEVERTEXATTRIBARRAYPROC, DisableVertexAttribArray); \
GLFUNC(PFNGLGETVERTEXATTRIBIVPROC, GetVertexAttribiv); \
GLFUNC(PFNGLPIXELSTOREIPROC, PixelStorei); \
GLFUNC(PFNGLREADPIXELS, ReadPixels); \
GLFUNC(PFNGLGETSTRINGPROC, GetString); \
GLFUNC(PFNGLGETINTEGERV, GetIntegerv); \
GLFUNC(PFNGLGETBOOLEANV, GetBooleanv); \
GLFUNC(PFNGLFINISHPROC, Finish);
// List of all OpenGL functions used by the runtime, which may not
// exist due to an older or less capable version of GL. In using any
// of these functions, code must test if they are NULL.
#define OPTIONAL_GL_FUNCTIONS \
GLFUNC(PFNGLGENVERTEXARRAYS, GenVertexArrays); \
GLFUNC(PFNGLBINDVERTEXARRAY, BindVertexArray); \
GLFUNC(PFNGLDELETEVERTEXARRAYS, DeleteVertexArrays); \
GLFUNC(PFNDRAWBUFFERS, DrawBuffers)
// ---------- Types ----------
using namespace Halide::Runtime::Internal;
namespace Halide { namespace Runtime { namespace Internal { namespace OpenGL {
extern WEAK halide_device_interface_t opengl_device_interface;
WEAK const char *gl_error_name(int32_t err) {
const char *result;
switch (err) {
case 0x500:
result = "GL_INVALID_ENUM";
break;
case 0x501:
result = "GL_INVALID_VALUE";
break;
case 0x502:
result = "GL_INVALID_OPERATION";
break;
case 0x503:
result = "GL_STACK_OVERFLOW";
break;
case 0x504:
result = "GL_STACK_UNDERFLOW";
break;
case 0x505:
result = "GL_OUT_OF_MEMORY";
break;
case 0x506:
result = "GL_INVALID_FRAMEBUFFER_OPERATION";
break;
case 0x507:
result = "GL_CONTEXT_LOST";
break;
case 0x8031:
result = "GL_TABLE_TOO_LARGE";
break;
default:
result = "<unknown GL error>";
break;
}
return result;
}
struct HalideMalloc {
__attribute__((always_inline)) HalideMalloc(void *user_context, size_t size)
: user_context(user_context), ptr(halide_malloc(user_context, size)) {}
__attribute__((always_inline)) ~HalideMalloc() {
halide_free(user_context, ptr);
}
void * const user_context;
void * const ptr;
};
enum OpenGLProfile {
OpenGL,
OpenGLES
};
struct Argument {
// The kind of data stored in an argument
enum Kind {
Invalid,
Uniform, // uniform variable
Varying, // varying attribute
Inbuf, // input texture
Outbuf // output texture
};
// The elementary data type of the argument
enum Type {
Void, Bool, Float, Int8, Int16, Int32, UInt8, UInt16, UInt32
};
char *name;
Kind kind;
Type type;
Argument *next;
};
struct KernelInfo {
char *name;
char *source;
Argument *arguments;
GLuint shader_id;
GLuint program_id;
};
struct ModuleState {
KernelInfo *kernel;
ModuleState *next;
};
// All persistent state maintained by the runtime.
struct GlobalState {
void init();
bool CheckAndReportError(void *user_context, const char *location);
bool initialized;
// Information about the OpenGL platform we're running on.
OpenGLProfile profile;
int major_version, minor_version;
bool have_vertex_array_objects;
bool have_texture_rg;
bool have_texture_float;
bool have_texture_rgb8_rgba8;
// Various objects shared by all filter kernels
GLuint framebuffer_id;
GLuint vertex_array_object;
GLuint vertex_buffer;
GLuint element_buffer;
// Declare pointers used OpenGL functions
#define GLFUNC(PTYPE,VAR) PTYPE VAR
USED_GL_FUNCTIONS;
OPTIONAL_GL_FUNCTIONS;
#undef GLFUNC
};
WEAK bool GlobalState::CheckAndReportError(void *user_context, const char *location) {
GLenum err = GetError();
if (err != GL_NO_ERROR) {
error(user_context) << "OpenGL error " << gl_error_name(err) << "(" << (int)err << ")" <<
" at " << location << ".\n" ;
return true;
}
return false;
}
WEAK GlobalState global_state;
// Saves & restores OpenGL state
class GLStateSaver {
public:
__attribute__((always_inline)) GLStateSaver() { save(); }
__attribute__((always_inline)) ~GLStateSaver() { restore(); }
private:
// The state variables
GLint active_texture;
GLint array_buffer_binding;
GLint element_array_buffer_binding;
GLint framebuffer_binding;
GLint program;
GLint vertex_array_binding;
GLint viewport[4];
GLboolean cull_face;
GLboolean depth_test;
int max_combined_texture_image_units;
GLint *texture_2d_binding;
int max_vertex_attribs;
GLint *vertex_attrib_array_enabled;
// Define these out-of-line as WEAK, to avoid LLVM error "MachO doesn't support COMDATs"
void save();
void restore();
};
WEAK void GLStateSaver::save()
{
global_state.GetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
global_state.GetIntegerv(GL_ARRAY_BUFFER_BINDING, &array_buffer_binding);
global_state.GetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &element_array_buffer_binding);
global_state.GetIntegerv(GL_FRAMEBUFFER_BINDING, &framebuffer_binding);
global_state.GetIntegerv(GL_CURRENT_PROGRAM, &program);
global_state.GetBooleanv(GL_CULL_FACE, &cull_face);
global_state.GetBooleanv(GL_DEPTH_TEST, &depth_test);
global_state.GetIntegerv(GL_VIEWPORT, viewport);
global_state.GetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_combined_texture_image_units);
texture_2d_binding = (GLint *) malloc(max_combined_texture_image_units * sizeof(GLint));
for (int i=0; i < max_combined_texture_image_units; i++) {
global_state.ActiveTexture(GL_TEXTURE0 + i);
global_state.GetIntegerv(GL_TEXTURE_BINDING_2D, &texture_2d_binding[i]);
}
global_state.GetIntegerv(GL_MAX_VERTEX_ATTRIBS, &max_vertex_attribs);
vertex_attrib_array_enabled = (GLint *) malloc(max_vertex_attribs * sizeof(GLint));
for (int i=0; i< max_vertex_attribs; i++) {
global_state.GetVertexAttribiv(i, GL_VERTEX_ATTRIB_ARRAY_ENABLED, &vertex_attrib_array_enabled[i]);
}
if (global_state.have_vertex_array_objects) {
global_state.GetIntegerv(GL_VERTEX_ARRAY_BINDING, &vertex_array_binding);
}
#ifdef DEBUG_RUNTIME
debug(NULL) << "Saved OpenGL state\n";
#endif
}
WEAK void GLStateSaver::restore()
{
#ifdef DEBUG_RUNTIME
debug(NULL) << "Restoring OpenGL state\n";
#endif
for (int i=0; i < max_combined_texture_image_units; i++) {
global_state.ActiveTexture(GL_TEXTURE0 + i);
global_state.BindTexture(GL_TEXTURE_2D, texture_2d_binding[i]);
}
free(texture_2d_binding);
for (int i=0; i< max_vertex_attribs; i++) {
if (vertex_attrib_array_enabled[i])
global_state.EnableVertexAttribArray(i);
else
global_state.DisableVertexAttribArray(i);
}
free(vertex_attrib_array_enabled);
if (global_state.have_vertex_array_objects) {
global_state.BindVertexArray(vertex_array_binding);
}
global_state.ActiveTexture(active_texture);
global_state.BindFramebuffer(GL_FRAMEBUFFER, framebuffer_binding);
global_state.BindBuffer(GL_ARRAY_BUFFER, array_buffer_binding);
global_state.BindBuffer(GL_ELEMENT_ARRAY_BUFFER, element_array_buffer_binding);
global_state.UseProgram(program);
global_state.Viewport(viewport[0], viewport[1], viewport[2], viewport[3]);
(cull_face ? global_state.Enable : global_state.Disable)(GL_CULL_FACE);
(depth_test ? global_state.Enable : global_state.Disable)(GL_DEPTH_TEST);
}
// A list of module-specific state. Each module corresponds to a single Halide filter
WEAK ModuleState *state_list;
WEAK const char *kernel_marker = "/// KERNEL ";
WEAK const char *input_marker = "/// IN_BUFFER ";
WEAK const char *output_marker = "/// OUT_BUFFER ";
WEAK const char *uniform_marker = "/// UNIFORM ";
WEAK const char *varying_marker = "/// VARYING ";
// ---------- Helper functions ----------
WEAK char *strndup(const char *s, size_t n) {
char *p = (char*)malloc(n+1);
memcpy(p, s, n);
p[n] = '\0';
return p;
}
// Strip whitespace from the right side of
// a string
WEAK char *strstrip(char *str, size_t n) {
char *pos = str;
while (pos != str+n
&& *pos != '\0'
&& *pos != '\n'
&& *pos != ' ') {
pos++;
}
*pos = '\0';
return str;
}
WEAK void debug_buffer(void *user_context, halide_buffer_t *buf) {
debug(user_context) << *buf << "\n";
}
WEAK GLuint make_shader(void *user_context, GLenum type,
const char *source, GLint *length) {
#ifdef DEBUG_RUNTIME
{
debug(user_context) << ((type == GL_VERTEX_SHADER) ? "GL_VERTEX_SHADER" : "GL_FRAGMENT_SHADER")
<< " SOURCE:\n";
// debug() will go thru Printer<> which has a fixed, non-growing size.
// Just pass the source directly to halide_print instead, so it won't get clipped.
halide_print(user_context, source);
}
#endif
GLuint shader = global_state.CreateShader(type);
if (global_state.CheckAndReportError(user_context, "make_shader(1)")) {
return 1;
}
if (*source == '\0') {
debug(user_context) << "Halide GLSL: passed shader source is empty, using default.\n";
const char *default_shader = "varying vec2 pixcoord;\n void main() { }";
global_state.ShaderSource(shader, 1, (const GLchar **)&default_shader, NULL);
} else {
global_state.ShaderSource(shader, 1, (const GLchar **)&source, length);
}
if (global_state.CheckAndReportError(user_context, "make_shader(2)")) {
return 1;
}
global_state.CompileShader(shader);
if (global_state.CheckAndReportError(user_context, "make_shader(3)")) {
return 1;
}
GLint shader_ok = 0;
global_state.GetShaderiv(shader, GL_COMPILE_STATUS, &shader_ok);
if (!shader_ok) {
print(user_context) << "Could not compile shader:\n";
GLint log_len;
global_state.GetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_len);
HalideMalloc log_tmp(user_context, log_len);
if (log_tmp.ptr) {
char *log = (char*) log_tmp.ptr;
global_state.GetShaderInfoLog(shader, log_len, NULL, log);
print(user_context) << log << "\n";
}
global_state.DeleteShader(shader);
return 0;
}
return shader;
}
// Check whether string starts with a given prefix.
// Returns pointer to character after matched prefix if successful or NULL.
WEAK const char *match_prefix(const char *s, const char *prefix) {
if (0 == strncmp(s, prefix, strlen(prefix))) {
return s + strlen(prefix);
}
return NULL;
}
// Parse declaration of the form "type name" and construct matching Argument.
WEAK Argument *parse_argument(void *user_context, const char *src,
const char *end) {
const char *name;
Argument::Type type = Argument::Void;
if ((name = match_prefix(src, "float "))) {
type = Argument::Float;
} else if ((name = match_prefix(src, "bool "))) {
type = Argument::Bool;
} else if ((name = match_prefix(src, "int8_t "))) {
type = Argument::Int8;
} else if ((name = match_prefix(src, "int16_t "))) {
type = Argument::Int16;
} else if ((name = match_prefix(src, "int32_t "))) {
type = Argument::Int32;
} else if ((name = match_prefix(src, "uint8_t "))) {
type = Argument::UInt8;
} else if ((name = match_prefix(src, "uint16_t "))) {
type = Argument::UInt16;
} else if ((name = match_prefix(src, "uint32_t "))) {
type = Argument::UInt32;
}
if (type == Argument::Void) {
error(user_context) << "Internal error: argument type not supported";
return NULL;
}
Argument *arg = (Argument *)malloc(sizeof(Argument));
arg->name = strndup(name, end - name);
arg->type = type;
arg->kind = Argument::Invalid;
arg->next = 0;
return arg;
}
// Create KernelInfo for a piece of GLSL code
WEAK KernelInfo *create_kernel(void *user_context, const char *src, int size) {
KernelInfo *kernel = (KernelInfo *)malloc(sizeof(KernelInfo));
kernel->source = strndup(src, size);
kernel->arguments = NULL;
kernel->program_id = 0;
debug(user_context) << "Compiling GLSL kernel (size = " << size << "):\n";
// Parse initial comment block
const char *line = kernel->source;
while (*line) {
const char *next_line = strchr(line, '\n') + 1;
if (!next_line)
next_line = line + size;
const char *args;
if ((args = match_prefix(line, kernel_marker))) {
// set name
kernel->name = strstrip(strndup(args, next_line - args), next_line - args);
} else if ((args = match_prefix(line, uniform_marker))) {
if (Argument *arg =
parse_argument(user_context, args, next_line - 1)) {
arg->kind = Argument::Uniform;
arg->next = kernel->arguments;
kernel->arguments = arg;
} else {
halide_error(user_context, "Invalid VAR marker");
goto error;
}
} else if ((args = match_prefix(line, varying_marker))) {
if (Argument *arg =
parse_argument(user_context, args, next_line - 1)) {
arg->kind = Argument::Varying;
arg->next = kernel->arguments;
kernel->arguments = arg;
} else {
halide_error(user_context, "Invalid VARYING marker");
goto error;
}
} else if ((args = match_prefix(line, input_marker))) {
if (Argument *arg = parse_argument(user_context, args, next_line - 1)) {
arg->kind = Argument::Inbuf;
arg->next = kernel->arguments;
kernel->arguments = arg;
} else {
error(user_context) << "Invalid IN_BUFFER marker";
goto error;
}
} else if ((args = match_prefix(line, output_marker))) {
if (Argument *arg = parse_argument(user_context, args, next_line - 1)) {
arg->kind = Argument::Outbuf;
arg->next = kernel->arguments;
kernel->arguments = arg;
} else {
error(user_context) << "Invalid OUT_BUFFER marker";
goto error;
}
} else {
// Stop parsing if we encounter something we don't recognize
break;
}
line = next_line;
}
// Arguments are currently in reverse order, flip the list.
{
Argument *cur = kernel->arguments;
kernel->arguments = NULL;
while (cur) {
Argument *next = cur->next;
cur->next = kernel->arguments;
kernel->arguments = cur;
cur = next;
}
}
return kernel;
error:
free(kernel);
return NULL;
}
// Delete all data associated with a kernel. Also release associated OpenGL
// shader and program.
WEAK void delete_kernel(void *user_context, KernelInfo *kernel) {
global_state.DeleteProgram(kernel->program_id);
#if 0 // TODO figure out why this got deleted.
global_state.DeleteShader(kernel->shader_id);
#endif
Argument *arg = kernel->arguments;
while (arg) {
Argument *next = arg->next;
free(arg->name);
free(arg);
arg = next;
}
free(kernel->source);
free(kernel->name);
free(kernel);
}
// Vertices and their order in a triangle strip for rendering a quad
// ranging from (-1,-1) to (1,1).
WEAK GLfloat quad_vertices[] = {
-1.0f, -1.0f, 1.0f, -1.0f,
-1.0f, 1.0f, 1.0f, 1.0f
};
WEAK GLuint quad_indices[] = { 0, 1, 2, 3 };
WEAK void GlobalState::init() {
initialized = false;
profile = OpenGL;
major_version = 2;
minor_version = 0;
framebuffer_id = 0;
vertex_array_object = vertex_buffer = element_buffer = 0;
have_vertex_array_objects = false;
have_texture_rg = false;
have_texture_rgb8_rgba8 = false;
// Initialize all GL function pointers to NULL
#define GLFUNC(type, name) name = NULL;
USED_GL_FUNCTIONS;
OPTIONAL_GL_FUNCTIONS;
#undef GLFUNC
}
WEAK int load_gl_func(void *user_context, const char *name, void **ptr, bool required) {
void *p = halide_opengl_get_proc_address(user_context, name);
if (!p && required) {
error(user_context) << "Could not load function pointer for " << name;
return -1;
}
*ptr = p;
return 0;
}
WEAK bool extension_supported(void *user_context, const char *name) {
// Iterate over space delimited extension strings. Note that glGetStringi
// is not part of GL ES 2.0, and not reliable in all implementations of
// GL ES 3.0.
const char *start = (const char *)global_state.GetString(GL_EXTENSIONS);
if (!start) {
return false;
}
while (const char *pos = strstr(start, name)) {
const char *end = pos + strlen(name);
// Ensure the found match is a full word, not a substring.
if ((pos == start || pos[-1] == ' ') &&
(*end == ' ' || *end == '\0')) {
return true;
}
start = end;
}
return false;
}
// Check for availability of various version- and extension-specific features
// and hook up functions pointers as necessary
WEAK void init_extensions(void *user_context) {
if (global_state.major_version >= 3) { // This is likely valid for both OpenGL and OpenGL ES
load_gl_func(user_context, "glGenVertexArrays", (void**)&global_state.GenVertexArrays, false);
load_gl_func(user_context, "glBindVertexArray", (void**)&global_state.BindVertexArray, false);
load_gl_func(user_context, "glDeleteVertexArrays", (void**)&global_state.DeleteVertexArrays, false);
if (global_state.GenVertexArrays && global_state.BindVertexArray && global_state.DeleteVertexArrays) {
global_state.have_vertex_array_objects = true;
}
}
load_gl_func(user_context, "glDrawBuffers", (void**)&global_state.DrawBuffers, false);
global_state.have_texture_rg =
global_state.major_version >= 3 ||
(global_state.profile == OpenGL &&
extension_supported(user_context, "GL_ARB_texture_rg")) ||
(global_state.profile == OpenGLES &&
extension_supported(user_context, "GL_EXT_texture_rg"));
global_state.have_texture_rgb8_rgba8 =
global_state.major_version >= 3 ||
(global_state.profile == OpenGLES &&
extension_supported(user_context, "GL_OES_rgb8_rgba8"));
global_state.have_texture_float =
(global_state.major_version >= 3) ||
(global_state.profile == OpenGL &&
extension_supported(user_context, "GL_ARB_texture_float")) ||
(global_state.profile == OpenGLES &&
extension_supported(user_context, "GL_OES_texture_float"));
}
WEAK const char *parse_int(const char *str, int *val) {
int v = 0;
size_t i = 0;
while (str[i] >= '0' && str[i] <= '9') {
v = 10 * v + (str[i] - '0');
i++;
}
if (i > 0) {
*val = v;
return &str[i];
}
return NULL;
}
WEAK const char *parse_opengl_version(const char *str, int *major, int *minor) {
str = parse_int(str, major);
if (str == NULL || *str != '.') {
return NULL;
}
return parse_int(str + 1, minor);
}
// Initialize the OpenGL-specific parts of the runtime.
WEAK int halide_opengl_init(void *user_context) {
if (global_state.initialized) {
return 0;
}
#ifdef DEBUG_RUNTIME
halide_start_clock(user_context);
#endif
global_state.init();
// Make a context if there isn't one
if (halide_opengl_create_context(user_context)) {
error(user_context) << "Failed to make OpenGL context";
return -1;
}
// Initialize pointers to core OpenGL functions.
#define GLFUNC(TYPE, VAR) \
if (load_gl_func(user_context, "gl" #VAR, (void**)&global_state.VAR, true) < 0) { \
return -1; \
}
USED_GL_FUNCTIONS;
#undef GLFUNC
const char *version = (const char *)global_state.GetString(GL_VERSION);
const char *gles_version = match_prefix(version, "OpenGL ES ");
int major, minor;
if (gles_version && parse_opengl_version(gles_version, &major, &minor)) {
global_state.profile = OpenGLES;
global_state.major_version = major;
global_state.minor_version = minor;
} else if (parse_opengl_version(version, &major, &minor)) {
global_state.profile = OpenGL;
global_state.major_version = major;
global_state.minor_version = minor;
} else {
global_state.profile = OpenGL;
global_state.major_version = 2;
global_state.minor_version = 0;
}
init_extensions(user_context);
debug(user_context)
<< "Halide running on OpenGL " << ((global_state.profile == OpenGL) ? "" : "ES ") << major << "." << minor << "\n"
<< " vertex_array_objects: " << (global_state.have_vertex_array_objects ? "yes\n" : "no\n")
<< " texture_rg: " << (global_state.have_texture_rg ? "yes\n" : "no\n")
<< " have_texture_rgb8_rgba8: " << (global_state.have_texture_rgb8_rgba8 ? "yes\n" : "no\n")
<< " texture_float: " << (global_state.have_texture_float ? "yes\n" : "no\n");
// Initialize framebuffer.
global_state.GenFramebuffers(1, &global_state.framebuffer_id);
if (global_state.CheckAndReportError(user_context, "halide_opengl_init GenFramebuffers")) {
return 1;
}
// Initialize vertex and element buffers.
GLuint buf[2];
global_state.GenBuffers(2, buf);
global_state.BindBuffer(GL_ARRAY_BUFFER, buf[0]);
global_state.BufferData(GL_ARRAY_BUFFER, sizeof(quad_vertices), quad_vertices, GL_STATIC_DRAW);
global_state.BindBuffer(GL_ARRAY_BUFFER, 0);
global_state.BindBuffer(GL_ELEMENT_ARRAY_BUFFER, buf[1]);
global_state.BufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(quad_indices), quad_indices, GL_STATIC_DRAW);
global_state.BindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
global_state.vertex_buffer = buf[0];
global_state.element_buffer = buf[1];
if (global_state.have_vertex_array_objects) {
global_state.GenVertexArrays(1, &global_state.vertex_array_object);
if (global_state.CheckAndReportError(user_context, "halide_opengl_init GenVertexArrays")) {
return 1;
}
}
global_state.initialized = true;
return 0;
}
// Release all data allocated by the runtime.
//
// The OpenGL context itself is generally managed by the host application, so
// we leave it untouched.
WEAK int halide_opengl_device_release(void *user_context) {
if (!global_state.initialized) {
return 0;
}
debug(user_context) << "halide_opengl_release\n";
global_state.DeleteFramebuffers(1, &global_state.framebuffer_id);
ModuleState *mod = state_list;
while (mod) {
delete_kernel(user_context, mod->kernel);
mod->kernel = NULL;
ModuleState *next = mod->next;
// do not call free(mod) to avoid dangling pointers: the module state
// is still referenced in the code generated by Halide (see
// CodeGen_GPU_Host::get_module_state).
mod = next;
}
global_state.DeleteBuffers(1, &global_state.vertex_buffer);
global_state.DeleteBuffers(1, &global_state.element_buffer);
if (global_state.have_vertex_array_objects) {
global_state.DeleteVertexArrays(1, &global_state.vertex_array_object);
}
global_state = GlobalState();
return 0;
}
// Determine OpenGL texture format and channel type for a given halide_buffer_t.
WEAK bool get_texture_format(void *user_context, halide_buffer_t *buf,
GLint *internal_format, GLint *format, GLint *type) {
if (buf->type == halide_type_of<uint8_t>()) {
*type = GL_UNSIGNED_BYTE;
} else if (buf->type == halide_type_of<uint16_t>()) {
*type = GL_UNSIGNED_SHORT;
} else if (buf->type == halide_type_of<float>()) {
*type = GL_FLOAT;
} else {
error(user_context) << "OpenGL: Only uint8, uint16, and float textures are supported.";
return false;
}
const int channels = (buf->dimensions > 2) ? buf->dim[2].extent : 0;
// GL_LUMINANCE and GL_LUMINANCE_ALPHA aren't color-renderable in ES2, period,
// thus can't be read back via ReadPixels, thus are nearly useless to us.
// GL_RED and GL_RG are technically optional in ES2 (required in ES3),
// but as a practical matter, they are supported on pretty much every recent device
// (iOS: everything >= iPhone 4s; Android: everything >= 4.3 plus various older devices).
// This is definitely suboptimal; the only real alternative would be to implement
// these as GL_RGB or GL_RGBA, ignoring the extra channels.
if (channels <= 2 && !global_state.have_texture_rg) {
error(user_context) << "OpenGL: 1 and 2 channel textures are not supported for this version of OpenGL.";
return false;
}
// Common formats supported by both GLES 2.0 and GL 2.1 are selected below
//
switch(channels) {
case 0:
case 1:
*format = GL_RED;
break;
case 2:
*format = GL_RG;
break;
case 3:
*format = GL_RGB;
break;
case 4:
*format = GL_RGBA;
break;
default:
error(user_context) << "OpenGL: Invalid number of color channels: " << channels;
return false;
}
switch (global_state.profile) {
case OpenGLES:
// For OpenGL ES, the texture format has to match the pixel format
// since there no conversion is performed during texture transfers.
// See OES_texture_float.
*internal_format = *format;
break;
case OpenGL:
// For desktop OpenGL, the internal format specifiers include the
// precise data type, see ARB_texture_float.
if (*type == GL_FLOAT) {
switch (*format) {
case GL_RED:
case GL_RG:
case GL_RGB:
case GL_RGBA:
*internal_format = GL_RGBA32F;
break;
default:
error(user_context) << "OpenGL: Cannot select internal format for format " << *format;
return false;
}
} else {
*internal_format = *format;
}
break;
}
return true;
}
// This function returns the width, height and number of color channels that the
// texture for the specified halide_buffer_t will contain. It provides a single place
// to implement the logic snapping zero sized dimensions to one element.
WEAK bool get_texture_dimensions(void *user_context, halide_buffer_t *buf, GLint *width,
GLint *height, GLint *channels) {
if (buf->dimensions > 3) {
error(user_context) << "The GL backend supports buffers of at most 3 dimensions\n";
return false;
}
*width = buf->dim[0].extent;
if (*width == 0) {
error(user_context) << "Invalid dim[0].extent: " << *width << "\n";
return false;
}
// GLES 2.0 supports GL_TEXTURE_2D (plus cube map), but not 1d or 3d. If we
// end up with a buffer that has a zero extent, set the corresponding size
// to one.
*height = (buf->dimensions > 1) ? buf->dim[1].extent : 1;
*channels = (buf->dimensions > 2) ? buf->dim[2].extent : 1;
return true;
}
// Allocate a new texture matching the dimension and color format of the
// specified buffer.
WEAK int halide_opengl_device_malloc(void *user_context, halide_buffer_t *buf) {
if (int error = halide_opengl_init(user_context)) {
return error;
}
if (!buf) {
error(user_context) << "Invalid buffer";
return 1;
}
// If the texture was already created by the host application, check that
// it has the correct format. Otherwise, allocate and set up an
// appropriate texture.
GLuint tex = 0;
bool halide_allocated = false;
if (buf->device) {
#ifdef HAVE_GLES3
// Look up the width and the height from the existing texture. Note that
// glGetTexLevelParameteriv does not support GL_TEXTURE_WIDTH or
// GL_TEXTURE_HEIGHT in GLES 2.0
GLint width, height;
global_state.BindTexture(GL_TEXTURE_2D, tex);
global_state.GetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
global_state.GetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height);
if (global_state.CheckAndReportError(user_context, "halide_opengl_device_malloc binding texture (GLES3)")) {
return 1;
}
if (width < buf->dim[0].extent || height < buf->dim[1].extent) {
error(user_context)
<< "Existing texture is smaller than buffer. "
<< "Texture size: " << width << "x" << height
<< ", buffer size: " << buf->dim[0].extent << "x" << buf->dim[1].extent;
return 1;
}
#endif
uint64_t handle = buf->device;
tex = (handle == HALIDE_OPENGL_RENDER_TARGET) ? 0 : (GLuint)handle;
} else {
if (buf->dimensions > 3) {
error(user_context) << "high-dimensional textures are not supported";
return 1;
}
// Generate texture ID
global_state.GenTextures(1, &tex);
if (global_state.CheckAndReportError(user_context, "halide_opengl_device_malloc GenTextures")) {
global_state.DeleteTextures(1, &tex);
return 1;
}
// Set parameters for this texture: no interpolation and clamp to edges.
global_state.BindTexture(GL_TEXTURE_2D, tex);
global_state.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
global_state.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
global_state.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
global_state.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
if (global_state.CheckAndReportError(user_context, "halide_opengl_device_malloc binding texture")) {
global_state.DeleteTextures(1, &tex);
return 1;
}
// Create empty texture here and fill it with glTexSubImage2D later.
GLint internal_format, format, type;
if (!get_texture_format(user_context, buf, &internal_format, &format, &type)) {
error(user_context) << "Invalid texture format";
global_state.DeleteTextures(1, &tex);
return 1;
}
GLint width, height, channels;
if (!get_texture_dimensions(user_context, buf, &width, &height, &channels)) {
error(user_context) << "Invalid texture dimensions";
return 1;
}
global_state.TexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, format, type, NULL);
if (global_state.CheckAndReportError(user_context, "halide_opengl_device_malloc TexImage2D")) {
global_state.DeleteTextures(1, &tex);
return 1;
}
buf->device = tex;
buf->device_interface = &opengl_device_interface;
buf->device_interface->impl->use_module();
halide_allocated = true;
debug(user_context) << "Allocated texture " << tex
<< " of size " << width << " x " << height << "\n";
global_state.BindTexture(GL_TEXTURE_2D, 0);
}
return 0;
}
// Delete all texture information associated with a buffer.
WEAK int halide_opengl_device_free(void *user_context, halide_buffer_t *buf) {
if (!global_state.initialized) {
error(user_context) << "OpenGL runtime not initialized in call to halide_opengl_device_free.";
return 1;
}
if (buf->device == 0) {
return 0;
}
uint64_t handle = buf->device;
GLuint tex = (handle == HALIDE_OPENGL_RENDER_TARGET) ? 0 : (GLuint)handle;
int result = 0;
debug(user_context) << "halide_opengl_device_free: Deleting texture " << tex << "\n";
global_state.DeleteTextures(1, &tex);
if (global_state.CheckAndReportError(user_context, "halide_opengl_device_free DeleteTextures")) {
result = 1;
// do not return: we want to zero out the interface and
// device fields even if we can't delete the texture.
}
buf->device = 0;
buf->device_interface->impl->release_module();
buf->device_interface = NULL;
return result;
}
// Can't use std::min, std::max in Halide runtime.
template<typename T> __attribute__((always_inline)) T std_min(T a, T b) { return (a < b) ? a : b; }
template<typename T> __attribute__((always_inline)) T std_max(T a, T b) { return (a > b) ? a : b; }
// This method copies image data from the layout specified by the strides of the
// halide_buffer_t to the packed interleaved format needed by GL. It is assumed that
// src and dst have the same number of channels.
template <class T>
__attribute__((always_inline))
void halide_to_interleaved(const halide_buffer_t *src_buf, T *dst) {
const T *src = reinterpret_cast<const T *>(src_buf->host);
int width = (src_buf->dimensions > 0) ? src_buf->dim[0].extent : 1;
int height = (src_buf->dimensions > 1) ? src_buf->dim[1].extent : 1;
int channels = (src_buf->dimensions > 2) ? src_buf->dim[2].extent : 1;
int x_stride = (src_buf->dimensions > 0) ? src_buf->dim[0].stride : 0;
int y_stride = (src_buf->dimensions > 1) ? src_buf->dim[1].stride : 0;
int c_stride = (src_buf->dimensions > 2) ? src_buf->dim[2].stride : 0;
for (int y = 0; y < height; y++) {
int dstidx = y * width * channels;
for (int x = 0; x < width; x++) {
int srcidx = y * y_stride + x * x_stride;
for (int c = 0; c < channels; c++) {
dst[dstidx] = src[srcidx];
srcidx += c_stride;
dstidx += 1;
}
}
}
}
// This method copies image data from the packed interleaved format needed by GL
// to the arbitrary strided layout specified by the halide_buffer_t. If src has fewer
// channels than dst, the excess in dst will be left untouched; if src has
// more channels than dst, the excess will be ignored.
template <class T>
__attribute__((always_inline))
void interleaved_to_halide(void *user_context, const T *src, int src_channels, halide_buffer_t *dst_buf) {
T *dst = reinterpret_cast<T*>(dst_buf->host);
int width = (dst_buf->dimensions > 0) ? dst_buf->dim[0].extent : 1;
int height = (dst_buf->dimensions > 1) ? dst_buf->dim[1].extent : 1;
int dst_channels = (dst_buf->dimensions > 2) ? dst_buf->dim[2].extent : 1;
int x_stride = (dst_buf->dimensions > 0) ? dst_buf->dim[0].stride : 0;
int y_stride = (dst_buf->dimensions > 1) ? dst_buf->dim[1].stride : 0;
int c_stride = (dst_buf->dimensions > 2) ? dst_buf->dim[2].stride : 0;
int src_skip = std_max(0, src_channels - dst_channels);
int channels = std_min<int>(src_channels, dst_channels);
for (int y = 0; y < height; y++) {
int srcidx = y * width * src_channels;
for (int x = 0; x < width; x++) {
int dstidx = y * y_stride + x * x_stride;
for (int c = 0; c < channels; c++) {
dst[dstidx] = src[srcidx];
srcidx += 1;
dstidx += c_stride;
}
srcidx += src_skip;
}
}
}
// Copy image data from host memory to texture.
WEAK int halide_opengl_copy_to_device(void *user_context, halide_buffer_t *buf) {
if (!global_state.initialized) {
error(user_context) << "OpenGL runtime not initialized (halide_opengl_copy_to_device).";
return 1;
}
GLStateSaver state_saver;
int err = halide_opengl_device_malloc(user_context, buf);
if (err) {
return err;
}
if (!buf->host || !buf->device) {
debug_buffer(user_context, buf);
error(user_context) << "Invalid copy_to_device operation: host or device NULL";
return 1;
}
uint64_t handle = buf->device;
if (handle == HALIDE_OPENGL_RENDER_TARGET) {
// TODO: this isn't correct; we want to ensure we copy to the current render_target.
debug(user_context) << "halide_opengl_copy_to_device: called for HALIDE_OPENGL_RENDER_TARGET\n";
return 0;
}
GLuint tex = (GLuint)handle;
debug(user_context) << "halide_opengl_copy_to_device: " << tex << "\n";
global_state.BindTexture(GL_TEXTURE_2D, tex);
if (global_state.CheckAndReportError(user_context, "halide_opengl_copy_to_device BindTexture")) {
return 1;
}
GLint internal_format, format, type;
if (!get_texture_format(user_context, buf, &internal_format, &format, &type)) {
error(user_context) << "Invalid texture format";
return 1;
}
GLint width, height, buffer_channels;
if (!get_texture_dimensions(user_context, buf, &width, &height, &buffer_channels)) {
error(user_context) << "Invalid texture dimensions";
return 1;
}
// To use TexSubImage2D directly, the colors must be stored interleaved
// and rows must be stored consecutively.
// (Single-channel buffers are "interleaved" for our purposes here.)
bool is_interleaved = (buffer_channels == 1) || (buf->dim[2].stride == 1 && buf->dim[0].stride == buf->dim[2].extent);
bool is_packed = (buf->dim[1].stride == buf->dim[0].extent * buf->dim[0].stride);
if (is_interleaved && is_packed) {
global_state.PixelStorei(GL_UNPACK_ALIGNMENT, 1);
global_state.TexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, buf->host);
if (global_state.CheckAndReportError(user_context, "halide_opengl_copy_to_device TexSubImage2D(1)")) {
return 1;
}
} else {
debug(user_context)
<< "Warning: In copy_to_device, host buffer is not interleaved. Doing slow interleave.\n";
size_t texture_size = width * height * buffer_channels * buf->type.bytes();
HalideMalloc tmp(user_context, texture_size);
if (!tmp.ptr) {
error(user_context) << "halide_malloc failed inside copy_to_device";
return -1;
}
switch (type) {
case GL_UNSIGNED_BYTE:
halide_to_interleaved<uint8_t>(buf, (uint8_t*)tmp.ptr);
break;
case GL_UNSIGNED_SHORT:
halide_to_interleaved<uint16_t>(buf, (uint16_t*)tmp.ptr);
break;
case GL_FLOAT:
halide_to_interleaved<float>(buf, (float*)tmp.ptr);
break;
}
global_state.PixelStorei(GL_UNPACK_ALIGNMENT, 1);
global_state.TexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, tmp.ptr);
if (global_state.CheckAndReportError(user_context, "halide_opengl_copy_to_device TexSubImage2D(2)")) {
return 1;
}
}
return 0;
}
// Copy image data from texture back to host memory.
WEAK int halide_opengl_copy_to_host(void *user_context, halide_buffer_t *buf) {
if (!global_state.initialized) {
error(user_context) << "OpenGL runtime not initialized (halide_opengl_copy_to_host).";
return 1;
}
GLStateSaver state_saver;
if (!buf->host || !buf->device) {
debug_buffer(user_context, buf);
error(user_context) << "Invalid copy_to_host operation: host or dev NULL";
return 1;
}
GLint internal_format, format, type;
if (!get_texture_format(user_context, buf, &internal_format, &format, &type)) {
error(user_context) << "Invalid texture format";
return 1;
}
GLint width, height, buffer_channels;
if (!get_texture_dimensions(user_context, buf, &width, &height, &buffer_channels)) {
error(user_context) << "Invalid texture dimensions";
return 1;
}
GLint texture_channels = buffer_channels;
uint64_t handle = buf->device;
if (handle != HALIDE_OPENGL_RENDER_TARGET) {
GLuint tex = (GLuint)handle;
debug(user_context) << "halide_copy_to_host: texture " << tex << "\n";
global_state.BindFramebuffer(GL_FRAMEBUFFER, global_state.framebuffer_id);
if (global_state.CheckAndReportError(user_context, "copy_to_host BindFramebuffer")) {
return 1;
}
global_state.FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, tex, 0);
if (global_state.CheckAndReportError(user_context, "copy_to_host FramebufferTexture2D")) {
return 1;
}
} else {
debug(user_context) << "halide_copy_to_host: HALIDE_OPENGL_RENDER_TARGET\n";
}
// Check that framebuffer is set up correctly
GLenum status = global_state.CheckFramebufferStatus(GL_FRAMEBUFFER);
if (status != GL_FRAMEBUFFER_COMPLETE) {
error(user_context)
<< "Setting up GL framebuffer " << global_state.framebuffer_id << " failed " << status;
return 1;
}
// The only format/type pairs guaranteed to be readable in GLES2 are GL_RGBA+GL_UNSIGNED_BYTE,
// plus one other implementation-dependent pair specified here. Spoiler alert:
// some ES2 implementations return that very same pair here (i.e., they don't support
// any other formats); in that case, we need to read as RGBA and manually convert to
// what we need (usually GL_RGB).
// NOTE: this requires the currently-bound Framebuffer is correct.
// TODO: short and float will require even more effort on top of this.
if (global_state.profile == OpenGLES && format == GL_RGB) {
GLint extra_format, extra_type;
global_state.GetIntegerv(GL_IMPLEMENTATION_COLOR_READ_TYPE, &extra_type);
if (type != GL_UNSIGNED_BYTE && type != extra_type) {
error(user_context) << "ReadPixels does not support our type; we don't handle this yet.\n";
return 1;
}
global_state.GetIntegerv(GL_IMPLEMENTATION_COLOR_READ_FORMAT, &extra_format);
if (format != GL_RGBA && format != extra_format) {
debug(user_context) << "ReadPixels does not support our format; falling back to GL_RGBA\n";
format = GL_RGBA;
texture_channels = 4;
}
}
// To download the texture directly, the colors must be stored interleaved
// and rows must be stored consecutively.
// (Single-channel buffers are "interleaved" for our purposes here.)
bool is_interleaved = (buffer_channels == 1) || (buf->dim[2].stride == 1 && buf->dim[0].stride == buf->dim[2].extent);
bool is_packed = (buf->dim[1].stride == buf->dim[0].extent * buf->dim[0].stride);
if (is_interleaved && is_packed && texture_channels == buffer_channels) {
global_state.PixelStorei(GL_PACK_ALIGNMENT, 1);
#ifdef DEBUG_RUNTIME
int64_t t1 = halide_current_time_ns(user_context);
#endif
global_state.ReadPixels(0, 0, buf->dim[0].extent, buf->dim[1].extent, format, type, buf->host);
#ifdef DEBUG_RUNTIME
int64_t t2 = halide_current_time_ns(user_context);
#endif
if (global_state.CheckAndReportError(user_context, "copy_to_host ReadPixels (1)")) {
return 1;
}
#ifdef DEBUG_RUNTIME
debug(user_context) << "ReadPixels(1) time: "<<(t2-t1)/1e3<<"usec\n";
#endif
} else {
debug(user_context)
<< "Warning: In copy_to_host, host buffer is not interleaved, or not a native format. Doing slow deinterleave.\n";
size_t texture_size = width * height * texture_channels * buf->type.bytes();
HalideMalloc tmp(user_context, texture_size);
if (!tmp.ptr) {
error(user_context) << "halide_malloc failed inside copy_to_host";
return -1;
}
global_state.PixelStorei(GL_PACK_ALIGNMENT, 1);
#ifdef DEBUG_RUNTIME
int64_t t1 = halide_current_time_ns(user_context);
#endif
global_state.ReadPixels(0, 0, buf->dim[0].extent, buf->dim[1].extent, format, type, tmp.ptr);
#ifdef DEBUG_RUNTIME
int64_t t2 = halide_current_time_ns(user_context);
debug(user_context)<<"ReadPixels(2) time: "<<(t2-t1)/1e3<<"usec\n";
#endif
if (global_state.CheckAndReportError(user_context, "copy_to_host ReadPixels (2)")) {
return 1;
}
// Premature optimization warning: interleaved_to_halide() could definitely
// be optimized, but ReadPixels() typically takes ~2-10x as long (especially on
// mobile devices), so the returns will be modest.
#ifdef DEBUG_RUNTIME
int64_t t3 = halide_current_time_ns(user_context);
#endif
switch (type) {
case GL_UNSIGNED_BYTE:
interleaved_to_halide<uint8_t>(user_context, (uint8_t*)tmp.ptr, texture_channels, buf);
break;
case GL_UNSIGNED_SHORT:
interleaved_to_halide<uint16_t>(user_context, (uint16_t*)tmp.ptr, texture_channels, buf);
break;
case GL_FLOAT:
interleaved_to_halide<float>(user_context, (float*)tmp.ptr, texture_channels, buf);
break;
}
#ifdef DEBUG_RUNTIME
int64_t t4 = halide_current_time_ns(user_context);
debug(user_context)<<"deinterleave time: "<<(t4-t3)/1e3<<"usec\n";
#endif
}
return 0;
}
}}}} // namespace Halide::Runtime::Internal::OpenGL
using namespace Halide::Runtime::Internal::OpenGL;
// Find the correct module for the called function
// TODO: This currently takes O(# of GLSL'd stages) and can
// be optimized
WEAK ModuleState* find_module(const char *stage_name) {
ModuleState* state_ptr = state_list;
while (state_ptr != NULL) {
KernelInfo *kernel = state_ptr->kernel;
if (kernel && strcmp(stage_name, kernel->name) == 0) {
return state_ptr;
}
state_ptr = state_ptr->next;
}
return NULL;
}
// Create wrappers that satisfy old naming conventions
extern "C" {
WEAK int halide_opengl_run(void *user_context,
void *state_ptr,
const char *entry_name,
int blocksX, int blocksY, int blocksZ,
int threadsX, int threadsY, int threadsZ,
int shared_mem_bytes,
size_t arg_sizes[], void *args[], int8_t is_buffer[],
int num_padded_attributes,
float* vertex_buffer,
int num_coords_dim0,
int num_coords_dim1) {
if (!global_state.initialized) {
error(user_context) << "OpenGL runtime not initialized (halide_opengl_run).";
return 1;
}
GLStateSaver state_saver;
// Find the right module
ModuleState *mod = find_module(entry_name);
if (!mod) {
error(user_context) << "Internal error: module state for stage " << entry_name << " not found\n";
return 1;
}
KernelInfo *kernel = mod->kernel;
global_state.UseProgram(kernel->program_id);
if (global_state.CheckAndReportError(user_context, "halide_opengl_run UseProgram")) {
return 1;
}
// TODO(abstephensg) it would be great to codegen these vec4 uniform buffers
// directly, instead of passing an array of arguments and then copying them
// out at runtime.
// Determine the number of float and int uniform parameters. This code
// follows the argument packing convention in CodeGen_GPU_Host and
// CodeGen_OpenGL_Dev
int num_uniform_floats = 0;
int num_uniform_ints = 0;
Argument *kernel_arg = kernel->arguments;
for (int i = 0; args[i]; i++, kernel_arg = kernel_arg->next) {
// Check for a mismatch between the number of arguments declared in the
// fragment shader source header and the number passed to this function
if (!kernel_arg) {
error(user_context)
<< "Too many arguments passed to halide_opengl_run\n"
<< "Argument " << i << ": size=" << i << " value=" << args[i];
return 1;
}
// Count the number of float and int uniform parameters.
if (kernel_arg->kind == Argument::Uniform) {
switch (kernel_arg->type) {
case Argument::Float:
// Integer parameters less than 32 bits wide are passed as
// normalized float values
case Argument::Int8:
case Argument::UInt8:
case Argument::Int16:
case Argument::UInt16:
++num_uniform_floats;
break;
case Argument::Bool:
case Argument::Int32:
case Argument::UInt32:
++num_uniform_ints;
break;
default:
error(user_context) << "GLSL: Encountered invalid kernel argument type";
return 1;
}
}
}
// Pad up to a multiple of four
int num_padded_uniform_floats = (num_uniform_floats + 0x3) & ~0x3;
int num_padded_uniform_ints = (num_uniform_ints + 0x3) & ~0x3;
// Allocate storage for the packed arguments
float uniform_float[num_padded_uniform_floats];
int uniform_int[num_padded_uniform_ints];
bool bind_render_targets = true;
// Copy input arguments to corresponding GLSL uniforms.
GLint num_active_textures = 0;
int uniform_float_idx = 0;
int uniform_int_idx = 0;
kernel_arg = kernel->arguments;
for (int i = 0; args[i]; i++, kernel_arg = kernel_arg->next) {
if (kernel_arg->kind == Argument::Outbuf) {
halide_assert(user_context, is_buffer[i] && "OpenGL Outbuf argument is not a buffer.");
// Check if the output buffer will be bound by the client instead of
// the Halide runtime
uint64_t handle = ((halide_buffer_t *)args[i])->device;
if (!handle) {
error(user_context) << "GLSL: Encountered invalid NULL dev pointer";
return 1;
}
if (handle == HALIDE_OPENGL_RENDER_TARGET) {
bind_render_targets = false;
}
// Outbuf textures are handled explicitly below
continue;
} else if (kernel_arg->kind == Argument::Inbuf) {
halide_assert(user_context, is_buffer[i] && "OpenGL Inbuf argument is not a buffer.")
GLint loc =
global_state.GetUniformLocation(kernel->program_id, kernel_arg->name);
if (global_state.CheckAndReportError(user_context, "halide_opengl_run GetUniformLocation(InBuf)")) {
return 1;
}
if (loc == -1) {
error(user_context) << "No sampler defined for input texture.";
return 1;
}
uint64_t handle = ((halide_buffer_t *)args[i])->device;
if (!handle) {
error(user_context) << "GLSL: Encountered invalid NULL dev pointer";
return 1;
}
global_state.ActiveTexture(GL_TEXTURE0 + num_active_textures);
global_state.BindTexture(GL_TEXTURE_2D, handle == HALIDE_OPENGL_RENDER_TARGET ? 0 : (GLuint)handle);
global_state.Uniform1iv(loc, 1, &num_active_textures);
// Textures not created by the Halide runtime might not have
// parameters set, or might have had parameters set differently
global_state.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
global_state.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
global_state.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
global_state.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
num_active_textures++;
// TODO: check maximum number of active textures
} else if (kernel_arg->kind == Argument::Uniform) {
// Copy the uniform parameter into the packed scalar list
// corresponding to its type.
// Note: small integers are represented as floats in GLSL.
switch (kernel_arg->type) {
case Argument::Float:
uniform_float[uniform_float_idx++] = *(float*)args[i];
break;
case Argument::Bool:
uniform_int[uniform_int_idx++] = *((bool*)args[i]) ? 1 : 0;
break;
case Argument::Int8:
uniform_float[uniform_float_idx++] = *((int8_t*)args[i]);
break;
case Argument::UInt8:
uniform_float[uniform_float_idx++] = *((uint8_t*)args[i]);
break;
case Argument::Int16: {
uniform_float[uniform_float_idx++] = *((int16_t*)args[i]);
break;
}
case Argument::UInt16: {
uniform_float[uniform_float_idx++] = *((uint16_t*)args[i]);
break;
}
case Argument::Int32: {
uniform_int[uniform_int_idx++] = *((int32_t*)args[i]);
break;
}
case Argument::UInt32: {
uint32_t value = *((uint32_t*)args[i]);
if (value > 0x7fffffff) {
error(user_context)
<< "OpenGL: argument '" << kernel_arg->name << "' is too large for GLint";
return -1;
}
uniform_int[uniform_int_idx++] = static_cast<GLint>(value);
break;
}
case Argument::Void:
error(user_context) <<"OpenGL: Encountered invalid kernel argument type";
return 1;
}
}
}
if (kernel_arg) {
error(user_context) << "Too few arguments passed to halide_opengl_run";
return 1;
}
// Set the packed uniform int parameters
for (int idx = 0; idx != num_padded_uniform_ints; idx += 4) {
// Produce the uniform parameter name without using the std library.
Printer<StringStreamPrinter,16> name(user_context);
name << "_uniformi" << (idx/4);
GLint loc = global_state.GetUniformLocation(kernel->program_id, name.str());
if (global_state.CheckAndReportError(user_context, "halide_opengl_run GetUniformLocation")) {
return 1;
}
if (loc == -1) {
// Argument was probably optimized away by GLSL compiler.
continue;
}
global_state.Uniform4iv(loc,1,&uniform_int[idx]);
}
// Set the packed uniform float parameters
for (int idx = 0; idx != num_padded_uniform_floats; idx += 4) {
// Produce the uniform parameter name without using the std library.
Printer<StringStreamPrinter,16> name(user_context);
name << "_uniformf" << (idx/4);
GLint loc = global_state.GetUniformLocation(kernel->program_id, name.str());
if (global_state.CheckAndReportError(user_context, "halide_opengl_run GetUniformLocation(2)")) {
return 1;
}
if (loc == -1) {
// Argument was probably optimized away by GLSL compiler.
continue;
}
global_state.Uniform4fv(loc,1,&uniform_float[idx]);
}
// Prepare framebuffer for rendering to output textures.
GLint output_min[2] = { 0, 0 };
GLint output_extent[2] = { 0, 0 };
if (bind_render_targets) {
global_state.BindFramebuffer(GL_FRAMEBUFFER, global_state.framebuffer_id);
}
global_state.Disable(GL_CULL_FACE);
global_state.Disable(GL_DEPTH_TEST);
GLint num_output_textures = 0;
kernel_arg = kernel->arguments;
for (int i = 0; args[i]; i++, kernel_arg = kernel_arg->next) {
if (kernel_arg->kind != Argument::Outbuf) continue;
halide_assert(user_context, is_buffer[i] && "OpenGL Outbuf argument is not a buffer.")
// TODO: GL_MAX_COLOR_ATTACHMENTS
if (num_output_textures >= 1) {
error(user_context)
<< "OpenGL ES 2.0 only supports one single output texture";
return 1;
}
halide_buffer_t *buf = (halide_buffer_t *)args[i];
halide_assert(user_context, buf->dimensions >= 2);
uint64_t handle = buf->device;
if (!handle) {
error(user_context) << "GLSL: Encountered invalid NULL dev pointer";
return 1;
}
GLuint tex = (handle == HALIDE_OPENGL_RENDER_TARGET) ? 0 : (GLuint)handle;
// Check to see if the object name is actually a FBO
if (bind_render_targets) {
debug(user_context)
<< "Output texture " << num_output_textures << ": " << tex << "\n";
global_state.FramebufferTexture2D(GL_FRAMEBUFFER,
GL_COLOR_ATTACHMENT0 + num_output_textures,
GL_TEXTURE_2D, tex, 0);
if (global_state.CheckAndReportError(user_context, "halide_opengl_run FramebufferTexture2D")) {
return 1;
}
}
output_min[0] = buf->dim[0].min;
output_min[1] = buf->dim[1].min;
output_extent[0] = buf->dim[0].extent;
output_extent[1] = buf->dim[1].extent;
num_output_textures++;
}
// TODO: GL_MAX_DRAW_BUFFERS
if (num_output_textures == 0) {
error(user_context) << "halide_opengl_run: kernel has no output\n";
// TODO: cleanup
return 1;
} else if (num_output_textures > 1) {
if (global_state.DrawBuffers) {
HalideMalloc draw_buffers_tmp(user_context, num_output_textures * sizeof(GLenum));
if (!draw_buffers_tmp.ptr) {
error(user_context) << "halide_malloc";
return 1;
}
GLenum *draw_buffers = (GLenum*)draw_buffers_tmp.ptr;
for (int i=0; i<num_output_textures; i++) {
draw_buffers[i] = GL_COLOR_ATTACHMENT0 + i;
}
global_state.DrawBuffers(num_output_textures, draw_buffers);
if (global_state.CheckAndReportError(user_context, "halide_opengl_run DrawBuffers")) {
return 1;
}
} else {
error(user_context) << "halide_opengl_run: kernel has more than one output and DrawBuffers is not available (earlier than GL ES 3.0?).\n";
// TODO: cleanup
return 1;
}
}
if (bind_render_targets) {
// Check that framebuffer is set up correctly
GLenum status = global_state.CheckFramebufferStatus(GL_FRAMEBUFFER);
if (global_state.CheckAndReportError(user_context, "halide_opengl_run CheckFramebufferStatus")) {
return 1;
}
if (status != GL_FRAMEBUFFER_COMPLETE) {
error(user_context)
<< "Setting up GL framebuffer " << global_state.framebuffer_id
<< " failed (" << status << ")";
// TODO: cleanup
return 1;
}
}
// Set vertex attributes
GLint loc = global_state.GetUniformLocation(kernel->program_id, "output_extent");
global_state.Uniform2iv(loc, 1, output_extent);
if (global_state.CheckAndReportError(user_context, "halide_opengl_run Uniform2iv(output_extent)")) {
return 1;
}
loc = global_state.GetUniformLocation(kernel->program_id, "output_min");
global_state.Uniform2iv(loc, 1, output_min);
if (global_state.CheckAndReportError(user_context, "halide_opengl_run Uniform2iv(output_min)")) {
return 1;
}
#if 0 // DEBUG_RUNTIME
debug(user_context) << "output_extent: " << output_extent[0] << "," << output_extent[1] << "\n";
debug(user_context) << "output_min: " << output_min[0] << "," << output_min[1] << "\n";
#endif
// TODO(abestephensg): Sort coordinate dimensions when the linear solver is integrated
// Sort the coordinates
// Construct an element buffer using the sorted vertex order.
// Note that this is "width" and "height" of the vertices, not the output image.
int width = num_coords_dim0;
int height = num_coords_dim1;
int vertex_buffer_size = width*height*num_padded_attributes;
int element_buffer_size = (width-1)*(height-1)*6;
int element_buffer[element_buffer_size];
int idx = 0;
for (int h=0;h!=(height-1);++h) {
for (int w=0;w!=(width-1);++w) {
// TODO(abestephensg): Use sorted coordinates when integrated
int v = w+h*width;
element_buffer[idx++] = v;
element_buffer[idx++] = v+1;
element_buffer[idx++] = v+width+1;
element_buffer[idx++] = v+width+1;
element_buffer[idx++] = v+width;
element_buffer[idx++] = v;
}
}
#if 0 // DEBUG_RUNTIME
debug(user_context) << "Vertex buffer:";
for (int i=0;i!=vertex_buffer_size;++i) {
if (!(i%num_padded_attributes)) {
debug(user_context) << "\n";
}
debug(user_context) << vertex_buffer[i] << " ";
}
debug(user_context) << "\n";
debug(user_context) << "\n";
debug(user_context) << "Element buffer:";
for (int i=0;i!=element_buffer_size;++i) {
if (!(i%3)) {
debug(user_context) << "\n";
}
debug(user_context) << element_buffer[i] << " ";
}
debug(user_context) << "\n";
#endif
// Setup viewport
global_state.Viewport(0, 0, output_extent[0], output_extent[1]);
// Setup the vertex and element buffers
GLuint vertex_array_object = 0;
if (global_state.have_vertex_array_objects) {
global_state.GenVertexArrays(1, &vertex_array_object);
global_state.BindVertexArray(vertex_array_object);
}
GLuint vertex_buffer_id;
global_state.GenBuffers(1, &vertex_buffer_id);
global_state.BindBuffer(GL_ARRAY_BUFFER, vertex_buffer_id);
global_state.BufferData(GL_ARRAY_BUFFER, sizeof(float)*vertex_buffer_size, vertex_buffer, GL_STATIC_DRAW);
if (global_state.CheckAndReportError(user_context, "halide_opengl_run vertex BufferData et al")) {
return 1;
}
GLuint element_buffer_id;
global_state.GenBuffers(1, &element_buffer_id);
global_state.BindBuffer(GL_ELEMENT_ARRAY_BUFFER, element_buffer_id);
global_state.BufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(float)*element_buffer_size, element_buffer, GL_STATIC_DRAW);
if (global_state.CheckAndReportError(user_context, "halide_opengl_run element BufferData et al")) {
return 1;
}
// The num_padded_attributes argument is the number of vertex attributes,
// including the spatial x and y coordinates, padded up to a multiple of
// four so that the attributes may be packed into vec4 slots.
int num_packed_attributes = num_padded_attributes/4;
// Set up the per vertex attributes
GLint attrib_ids[num_packed_attributes];
for (int i=0;i!=num_packed_attributes;i++) {
// The attribute names can synthesized by the runtime based on the
// number of packed varying attributes
Printer<StringStreamPrinter> attribute_name(user_context);
attribute_name << "_varyingf" << i << "_attrib";
// TODO(abstephensg): Switch to glBindAttribLocation
GLint attrib_id = global_state.GetAttribLocation(kernel->program_id, attribute_name.buf);
attrib_ids[i] = attrib_id;
// Check to see if the varying attribute was simplified out of the
// program by the GLSL compiler.
if (attrib_id == -1) {
continue;
}
global_state.VertexAttribPointer(attrib_id, 4, GL_FLOAT, GL_FALSE /* Normalized */, sizeof(GLfloat)*num_padded_attributes, (void*)(i*sizeof(GLfloat)*4));
if (global_state.CheckAndReportError(user_context, "halide_opengl_run VertexAttribPointer et al")) {
return 1;
}
global_state.EnableVertexAttribArray(attrib_id);
if (global_state.CheckAndReportError(user_context, "halide_opengl_run EnableVertexAttribArray et al")) {
return 1;
}
}
// Draw the scene
global_state.DrawElements(GL_TRIANGLES, element_buffer_size, GL_UNSIGNED_INT, NULL);
if (global_state.CheckAndReportError(user_context, "halide_opengl_run DrawElements et al")) {
return 1;
}
// Cleanup
if (global_state.have_vertex_array_objects) {
global_state.DeleteVertexArrays(1, &vertex_array_object);
}
global_state.DeleteBuffers(1, &vertex_buffer_id);
global_state.DeleteBuffers(1, &element_buffer_id);
return 0;
}
WEAK int halide_opengl_device_sync(void *user_context, struct halide_buffer_t *) {
if (!global_state.initialized) {
error(user_context) << "OpenGL runtime not initialized (halide_opengl_device_sync).";
return 1;
}
#ifdef DEBUG_RUNTIME
int64_t t0 = halide_current_time_ns(user_context);
#endif
global_state.Finish();
#ifdef DEBUG_RUNTIME
int64_t t1 = halide_current_time_ns(user_context);
debug(user_context) << "halide_opengl_device_sync: took " << (t1 - t0) / 1e3 << "usec\n";
#endif
return 0;
}
// Called at the beginning of a code block generated by Halide. This function
// is responsible for setting up the OpenGL environment and compiling the GLSL
// code into a fragment shader.
WEAK int halide_opengl_initialize_kernels(void *user_context, void **state_ptr,
const char *src, int size) {
debug(user_context) << "In initialize_kernels\n";
if (int error = halide_opengl_init(user_context)) {
return error;
}
const char *this_kernel = src;
ModuleState **state = (ModuleState **)state_ptr;
ModuleState *module = *state;
while (this_kernel) {
// Find the start of the next kernel
const char *next_kernel = strstr(this_kernel+1, kernel_marker);
// Use that to compute the length of this kernel
int len = 0;
if (!next_kernel) {
len = strlen(this_kernel);
} else {
len = next_kernel - this_kernel;
}
// Construct a new ModuleState and add it to the global list
module = (ModuleState *)malloc(sizeof(ModuleState));
module->kernel = NULL;
module->next = state_list;
state_list = module;
*state = module;
KernelInfo *kernel = module->kernel;
if (!kernel) {
kernel = create_kernel(user_context, this_kernel, len);
if (!kernel) {
error(user_context) << "Invalid kernel: " << this_kernel;
return -1;
}
module->kernel = kernel;
}
// Create the vertex shader. The runtime will output boilerplate for the
// vertex shader based on a fixed program plus arguments obtained from
// the comment header passed in the fragment shader. Since there are a
// relatively small number of vertices (i.e. usually only four), per-vertex
// expressions interpolated by varying attributes are evaluated
// by host code on the CPU and passed to the GPU as values in the
// vertex buffer.
enum { PrinterLength = 1024*4 };
Printer<StringStreamPrinter,PrinterLength> vertex_src(user_context);
// Count the number of varying attributes, this is 2 for the spatial
// x and y coordinates, plus the number of scalar varying attribute
// expressions pulled out of the fragment shader.
int num_varying_float = 2;
for (Argument* arg = kernel->arguments; arg; arg=arg->next) {
if (arg->kind == Argument::Varying)
++num_varying_float;
}
int num_packed_varying_float = ((num_varying_float + 3) & ~0x3) / 4;
for (int i = 0; i != num_packed_varying_float; ++i) {
vertex_src << "attribute vec4 _varyingf" << i << "_attrib;\n";
vertex_src << "varying vec4 _varyingf" << i << ";\n";
}
vertex_src << "uniform ivec2 output_min;\n"
<< "uniform ivec2 output_extent;\n"
<< "void main() {\n"
// Host codegen always passes the spatial vertex coordinates
// in the first two elements of the _varyingf0_attrib
<< " vec2 position = vec2(_varyingf0_attrib[0], _varyingf0_attrib[1]);\n"
<< " gl_Position = vec4(position, 0.0, 1.0);\n"
<< " vec2 texcoord = 0.5 * position + 0.5;\n"
<< " vec2 pixcoord = texcoord * vec2(output_extent.xy) + vec2(output_min.xy);\n";
// Copy through all of the varying attributes
for (int i = 0; i != num_packed_varying_float; ++i) {
vertex_src << " _varyingf" << i << " = _varyingf" << i << "_attrib;\n";
}
vertex_src << " _varyingf0.xy = pixcoord;\n";
vertex_src << "}\n";
// Check to see if there was sufficient storage for the vertex program.
if (vertex_src.size() >= PrinterLength) {
error(user_context) << "Vertex shader source truncated";
return 1;
}
// Initialize vertex shader.
GLuint vertex_shader_id = make_shader(user_context,
GL_VERTEX_SHADER, vertex_src.buf, NULL);
if (vertex_shader_id == 0) {
halide_error(user_context, "Failed to create vertex shader");
return 1;
}
// Create the fragment shader
GLuint fragment_shader_id = make_shader(user_context, GL_FRAGMENT_SHADER,
kernel->source, NULL);
// Link GLSL program
GLuint program = global_state.CreateProgram();
global_state.AttachShader(program, vertex_shader_id);
global_state.AttachShader(program, fragment_shader_id);
global_state.LinkProgram(program);
// Release the individual shaders
global_state.DeleteShader(vertex_shader_id);
global_state.DeleteShader(fragment_shader_id);
GLint status;
global_state.GetProgramiv(program, GL_LINK_STATUS, &status);
if (!status) {
GLint log_len;
global_state.GetProgramiv(program, GL_INFO_LOG_LENGTH, &log_len);
HalideMalloc log_tmp(user_context, log_len);
if (log_tmp.ptr) {
char *log = (char*) log_tmp.ptr;
global_state.GetProgramInfoLog(program, log_len, NULL, log);
debug(user_context) << "Could not link GLSL program:\n" << log << "\n";
}
global_state.DeleteProgram(program);
return -1;
}
kernel->program_id = program;
this_kernel = next_kernel;
}
return 0;
}
WEAK int halide_opengl_device_and_host_malloc(void *user_context, struct halide_buffer_t *buf) {
return halide_default_device_and_host_malloc(user_context, buf, &opengl_device_interface);
}
WEAK int halide_opengl_device_and_host_free(void *user_context, struct halide_buffer_t *buf) {
return halide_default_device_and_host_free(user_context, buf, &opengl_device_interface);
}
WEAK const halide_device_interface_t *halide_opengl_device_interface() {
return &opengl_device_interface;
}
WEAK void halide_opengl_context_lost(void *user_context) {
if (!global_state.initialized) return;
debug(user_context) << "halide_opengl_context_lost\n";
for (ModuleState *mod = state_list; mod; mod = mod->next) {
// Reset program handle to force recompilation.
mod->kernel->program_id = 0;
}
global_state.init();
return;
}
WEAK int halide_opengl_wrap_texture(void *user_context, halide_buffer_t *buf, uint64_t texture_id) {
if (!global_state.initialized) {
if (int error = halide_opengl_init(user_context)) {
return error;
}
}
if (texture_id == 0) {
error(user_context) << "Texture " << texture_id << " is not a valid texture name.";
return -3;
}
halide_assert(user_context, buf->device == 0);
if (buf->device != 0) {
return -2;
}
buf->device = texture_id;
buf->device_interface = &opengl_device_interface;
buf->device_interface->impl->use_module();
return 0;
}
WEAK int halide_opengl_wrap_render_target(void *user_context, halide_buffer_t *buf) {
if (!global_state.initialized) {
if (int error = halide_opengl_init(user_context)) {
return error;
}
}
halide_assert(user_context, buf->device == 0);
if (buf->device != 0) {
return -2;
}
buf->device = HALIDE_OPENGL_RENDER_TARGET;
buf->device_interface = &opengl_device_interface;
buf->device_interface->impl->use_module();
return 0;
}
WEAK int halide_opengl_detach_texture(void *user_context, halide_buffer_t *buf) {
if (buf->device == 0) {
return 0;
}
halide_assert(user_context, buf->device_interface == &opengl_device_interface);
buf->device = 0;
buf->device_interface->impl->release_module();
buf->device_interface = NULL;
return 0;
}
WEAK uintptr_t halide_opengl_get_texture(void *user_context, halide_buffer_t *buf) {
if (buf->device == 0) {
return 0;
}
halide_assert(user_context, buf->device_interface == &opengl_device_interface);
uint64_t handle = buf->device;
// client_bound always return 0 here.
return handle == HALIDE_OPENGL_RENDER_TARGET ? 0 : (uintptr_t)handle;
}
namespace {
__attribute__((destructor))
WEAK void halide_opengl_cleanup() {
halide_opengl_device_release(NULL);
}
}
} // extern "C"
namespace Halide { namespace Runtime { namespace Internal { namespace OpenGL {
WEAK halide_device_interface_impl_t opengl_device_interface_impl = {
halide_use_jit_module,
halide_release_jit_module,
halide_opengl_device_malloc,
halide_opengl_device_free,
halide_opengl_device_sync,
halide_opengl_device_release,
halide_opengl_copy_to_host,
halide_opengl_copy_to_device,
halide_opengl_device_and_host_malloc,
halide_opengl_device_and_host_free,
halide_default_buffer_copy,
halide_default_device_crop,
halide_default_device_release_crop,
halide_opengl_wrap_texture,
halide_opengl_detach_texture
};
WEAK halide_device_interface_t opengl_device_interface = {
halide_device_malloc,
halide_device_free,
halide_device_sync,
halide_device_release,
halide_copy_to_host,
halide_copy_to_device,
halide_device_and_host_malloc,
halide_device_and_host_free,
halide_buffer_copy,
halide_device_crop,
halide_device_release_crop,
halide_device_wrap_native,
halide_device_detach_native,
&opengl_device_interface_impl
};
}}}} // namespace Halide::Runtime::Internal::OpenGL
