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mpv/video/out/opengl/common.c

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/*
* common OpenGL routines
*
* copyleft (C) 2005-2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
* Special thanks go to the xine team and Matthias Hopf, whose video_out_opengl.c
* gave me lots of good ideas.
*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*
* You can alternatively redistribute this file and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*/
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <math.h>
#include <assert.h>
#include "common.h"
#include "common/common.h"
// This guesses if the current GL context is a suspected software renderer.
static bool is_software_gl(GL *gl)
{
const char *renderer = gl->GetString(GL_RENDERER);
const char *vendor = gl->GetString(GL_VENDOR);
return !(renderer && vendor) ||
strcmp(renderer, "Software Rasterizer") == 0 ||
strstr(renderer, "llvmpipe") ||
strcmp(vendor, "Microsoft Corporation") == 0 ||
strcmp(renderer, "Mesa X11") == 0;
}
static void GLAPIENTRY dummy_glBindFramebuffer(GLenum target, GLuint framebuffer)
{
assert(framebuffer == 0);
}
static bool check_ext(GL *gl, const char *name)
{
const char *exts = gl->extensions;
char *s = strstr(exts, name);
char *e = s ? s + strlen(name) : NULL;
return s && (s == exts || s[-1] == ' ') && (e[0] == ' ' || !e[0]);
}
#define FN_OFFS(name) offsetof(GL, name)
#define DEF_FN(name) {FN_OFFS(name), "gl" # name}
#define DEF_FN_NAME(name, str) {FN_OFFS(name), str}
struct gl_function {
ptrdiff_t offset;
char *name;
};
struct gl_functions {
const char *extension; // introduced with this extension in any version
int provides; // bitfield of MPGL_CAP_* constants
int ver_core; // introduced as required function
int ver_es_core; // introduced as required GL ES function
const struct gl_function *functions;
};
#define MAX_FN_COUNT 100 // max functions per gl_functions section
// Note: to keep the number of sections low, some functions are in multiple
// sections (if there are tricky combinations of GL/ES versions)
static const struct gl_functions gl_functions[] = {
// GL 2.1+ desktop and GLES 2.0+ (anything we support)
// Probably all of these are in GL 2.0 too, but we require GLSL 120.
{
.ver_core = 210,
.ver_es_core = 200,
.functions = (const struct gl_function[]) {
DEF_FN(ActiveTexture),
DEF_FN(AttachShader),
DEF_FN(BindAttribLocation),
DEF_FN(BindBuffer),
DEF_FN(BindTexture),
DEF_FN(BlendFuncSeparate),
DEF_FN(BufferData),
DEF_FN(Clear),
DEF_FN(ClearColor),
DEF_FN(CompileShader),
DEF_FN(CreateProgram),
DEF_FN(CreateShader),
DEF_FN(DeleteBuffers),
DEF_FN(DeleteProgram),
DEF_FN(DeleteShader),
DEF_FN(DeleteTextures),
DEF_FN(Disable),
DEF_FN(DisableVertexAttribArray),
DEF_FN(DrawArrays),
DEF_FN(Enable),
DEF_FN(EnableVertexAttribArray),
DEF_FN(Finish),
DEF_FN(Flush),
DEF_FN(GenBuffers),
DEF_FN(GenTextures),
DEF_FN(GetAttribLocation),
DEF_FN(GetError),
DEF_FN(GetIntegerv),
DEF_FN(GetProgramInfoLog),
DEF_FN(GetProgramiv),
DEF_FN(GetShaderInfoLog),
DEF_FN(GetShaderiv),
DEF_FN(GetString),
DEF_FN(GetUniformLocation),
DEF_FN(LinkProgram),
DEF_FN(PixelStorei),
DEF_FN(ReadPixels),
DEF_FN(ShaderSource),
DEF_FN(TexImage2D),
DEF_FN(TexParameteri),
DEF_FN(TexSubImage2D),
DEF_FN(Uniform1f),
DEF_FN(Uniform2f),
DEF_FN(Uniform3f),
DEF_FN(Uniform1i),
DEF_FN(UniformMatrix2fv),
DEF_FN(UniformMatrix3fv),
DEF_FN(UseProgram),
DEF_FN(VertexAttribPointer),
DEF_FN(Viewport),
{0}
},
},
// GL 2.1+ desktop only (and GLSL 120 shaders)
{
.ver_core = 210,
.provides = MPGL_CAP_ROW_LENGTH | MPGL_CAP_1D_TEX,
.functions = (const struct gl_function[]) {
DEF_FN(DrawBuffer),
DEF_FN(GetTexLevelParameteriv),
DEF_FN(MapBuffer),
DEF_FN(ReadBuffer),
DEF_FN(TexImage1D),
DEF_FN(UnmapBuffer),
{0}
},
},
// GL 3.0+ and ES 3.x core only functions.
{
.ver_core = 300,
.ver_es_core = 300,
.functions = (const struct gl_function[]) {
DEF_FN(BindBufferBase),
DEF_FN(BlitFramebuffer),
DEF_FN(GetStringi),
// for ES 3.0
DEF_FN(ReadBuffer),
DEF_FN(UnmapBuffer),
{0}
},
},
// For ES 3.1 core
{
.ver_es_core = 310,
.functions = (const struct gl_function[]) {
DEF_FN(GetTexLevelParameteriv),
{0}
},
},
{
.ver_core = 210,
.ver_es_core = 300,
.provides = MPGL_CAP_3D_TEX,
.functions = (const struct gl_function[]) {
DEF_FN(TexImage3D),
{0}
},
},
// Useful for ES 2.0
{
.ver_core = 110,
.ver_es_core = 300,
.extension = "GL_EXT_unpack_subimage",
.provides = MPGL_CAP_ROW_LENGTH,
},
// Framebuffers, extension in GL 2.x, core in GL 3.x core.
{
.ver_core = 300,
.ver_es_core = 200,
.extension = "GL_ARB_framebuffer_object",
.provides = MPGL_CAP_FB,
.functions = (const struct gl_function[]) {
DEF_FN(BindFramebuffer),
DEF_FN(GenFramebuffers),
DEF_FN(DeleteFramebuffers),
DEF_FN(CheckFramebufferStatus),
DEF_FN(FramebufferTexture2D),
{0}
},
},
// VAOs, extension in GL 2.x, core in GL 3.x core.
{
.ver_core = 300,
.ver_es_core = 300,
.extension = "GL_ARB_vertex_array_object",
.provides = MPGL_CAP_VAO,
.functions = (const struct gl_function[]) {
DEF_FN(GenVertexArrays),
DEF_FN(BindVertexArray),
DEF_FN(DeleteVertexArrays),
{0}
}
},
// GL_RED / GL_RG textures, extension in GL 2.x, core in GL 3.x core.
{
.ver_core = 300,
.ver_es_core = 300,
.extension = "GL_ARB_texture_rg",
.provides = MPGL_CAP_TEX_RG,
},
{
.ver_core = 320,
.extension = "GL_ARB_sync",
.functions = (const struct gl_function[]) {
DEF_FN(FenceSync),
DEF_FN(ClientWaitSync),
DEF_FN(DeleteSync),
{0}
},
},
// Swap control, always an OS specific extension
// The OSX code loads this manually.
{
.extension = "GLX_SGI_swap_control",
.functions = (const struct gl_function[]) {
DEF_FN_NAME(SwapInterval, "glXSwapIntervalSGI"),
{0},
},
},
{
.extension = "WGL_EXT_swap_control",
.functions = (const struct gl_function[]) {
DEF_FN_NAME(SwapInterval, "wglSwapIntervalEXT"),
{0},
},
},
{
.extension = "GLX_SGI_video_sync",
.functions = (const struct gl_function[]) {
DEF_FN_NAME(GetVideoSync, "glXGetVideoSyncSGI"),
DEF_FN_NAME(WaitVideoSync, "glXWaitVideoSyncSGI"),
{0},
},
},
// For gl_hwdec_vdpau.c
// http://www.opengl.org/registry/specs/NV/vdpau_interop.txt
{
.extension = "GL_NV_vdpau_interop",
.provides = MPGL_CAP_VDPAU,
.functions = (const struct gl_function[]) {
// (only functions needed by us)
DEF_FN(VDPAUInitNV),
DEF_FN(VDPAUFiniNV),
DEF_FN(VDPAURegisterOutputSurfaceNV),
DEF_FN(VDPAUUnregisterSurfaceNV),
DEF_FN(VDPAUSurfaceAccessNV),
DEF_FN(VDPAUMapSurfacesNV),
DEF_FN(VDPAUUnmapSurfacesNV),
{0}
},
},
#if HAVE_GL_DXINTEROP
{
.extension = "WGL_NV_DX_interop",
.provides = MPGL_CAP_DXINTEROP,
.functions = (const struct gl_function[]) {
DEF_FN_NAME(DXSetResourceShareHandleNV, "wglDXSetResourceShareHandleNV"),
DEF_FN_NAME(DXOpenDeviceNV, "wglDXOpenDeviceNV"),
DEF_FN_NAME(DXCloseDeviceNV, "wglDXCloseDeviceNV"),
DEF_FN_NAME(DXRegisterObjectNV, "wglDXRegisterObjectNV"),
DEF_FN_NAME(DXUnregisterObjectNV, "wglDXUnregisterObjectNV"),
DEF_FN_NAME(DXLockObjectsNV, "wglDXLockObjectsNV"),
DEF_FN_NAME(DXUnlockObjectsNV, "wglDXUnlockObjectsNV"),
{0}
},
},
#endif
// Apple Packed YUV Formats
// For gl_hwdec_vda.c
// http://www.opengl.org/registry/specs/APPLE/rgb_422.txt
{
.extension = "GL_APPLE_rgb_422",
.provides = MPGL_CAP_APPLE_RGB_422,
},
{
.ver_core = 430,
.extension = "GL_ARB_debug_output",
.provides = MPGL_CAP_DEBUG,
.functions = (const struct gl_function[]) {
// (only functions needed by us)
DEF_FN(DebugMessageCallback),
{0}
},
},
// These don't exist - they are for the sake of mpv internals, and libmpv
// interaction (see libmpv/opengl_cb.h).
{
.extension = "GL_MP_MPGetNativeDisplay",
.functions = (const struct gl_function[]) {
DEF_FN(MPGetNativeDisplay),
{0}
},
},
// Same, but using the old name.
{
.extension = "GL_MP_D3D_interfaces",
.functions = (const struct gl_function[]) {
DEF_FN_NAME(MPGetNativeDisplay, "glMPGetD3DInterface"),
{0}
},
},
// uniform buffer object extensions, requires OpenGL 3.1.
{
.ver_core = 310,
.ver_es_core = 300,
.extension = "GL_ARB_uniform_buffer_object",
.functions = (const struct gl_function[]) {
DEF_FN(GetUniformBlockIndex),
DEF_FN(UniformBlockBinding),
{0}
},
},
};
#undef FN_OFFS
#undef DEF_FN_HARD
#undef DEF_FN
#undef DEF_FN_NAME
// Fill the GL struct with function pointers and extensions from the current
// GL context. Called by the backend.
// getProcAddress: function to resolve function names, may be NULL
// ext2: an extra extension string
// log: used to output messages
// Note: if you create a CONTEXT_FORWARD_COMPATIBLE_BIT_ARB with OpenGL 3.0,
// you must append "GL_ARB_compatibility" to ext2.
void mpgl_load_functions2(GL *gl, void *(*get_fn)(void *ctx, const char *n),
void *fn_ctx, const char *ext2, struct mp_log *log)
{
talloc_free_children(gl);
*gl = (GL) {
.extensions = talloc_strdup(gl, ext2 ? ext2 : ""),
};
gl->GetString = get_fn(fn_ctx, "glGetString");
if (!gl->GetString) {
mp_err(log, "Can't load OpenGL functions.\n");
goto error;
}
int major = 0, minor = 0;
const char *version_string = gl->GetString(GL_VERSION);
if (!version_string)
goto error;
mp_verbose(log, "GL_VERSION='%s'\n", version_string);
if (strncmp(version_string, "OpenGL ES ", 10) == 0) {
version_string += 10;
gl->es = 100;
}
if (sscanf(version_string, "%d.%d", &major, &minor) < 2)
goto error;
gl->version = MPGL_VER(major, minor);
mp_verbose(log, "Detected %s %d.%d.\n", gl->es ? "GLES" : "desktop OpenGL",
major, minor);
if (gl->es) {
gl->es = gl->version;
gl->version = 0;
if (gl->es < 200) {
mp_fatal(log, "At least GLESv2 required.\n");
goto error;
}
}
mp_verbose(log, "GL_VENDOR='%s'\n", gl->GetString(GL_VENDOR));
mp_verbose(log, "GL_RENDERER='%s'\n", gl->GetString(GL_RENDERER));
const char *shader = gl->GetString(GL_SHADING_LANGUAGE_VERSION);
if (shader)
mp_verbose(log, "GL_SHADING_LANGUAGE_VERSION='%s'\n", shader);
if (gl->version >= 300) {
gl->GetStringi = get_fn(fn_ctx, "glGetStringi");
gl->GetIntegerv = get_fn(fn_ctx, "glGetIntegerv");
if (!(gl->GetStringi && gl->GetIntegerv))
goto error;
GLint exts;
gl->GetIntegerv(GL_NUM_EXTENSIONS, &exts);
for (int n = 0; n < exts; n++) {
const char *ext = gl->GetStringi(GL_EXTENSIONS, n);
gl->extensions = talloc_asprintf_append(gl->extensions, " %s", ext);
}
} else {
const char *ext = (char*)gl->GetString(GL_EXTENSIONS);
gl->extensions = talloc_asprintf_append(gl->extensions, " %s", ext);
}
mp_dbg(log, "Combined OpenGL extensions string:\n%s\n", gl->extensions);
for (int n = 0; n < MP_ARRAY_SIZE(gl_functions); n++) {
const struct gl_functions *section = &gl_functions[n];
int version = gl->es ? gl->es : gl->version;
int ver_core = gl->es ? section->ver_es_core : section->ver_core;
// NOTE: Function entrypoints can exist, even if they do not work.
// We must always check extension strings and versions.
bool exists = false, must_exist = false;
if (ver_core)
must_exist = version >= ver_core;
if (section->extension && check_ext(gl, section->extension))
exists = true;
exists |= must_exist;
if (!exists)
continue;
void *loaded[MAX_FN_COUNT] = {0};
bool all_loaded = true;
const struct gl_function *fnlist = section->functions;
for (int i = 0; fnlist && fnlist[i].name; i++) {
const struct gl_function *fn = &fnlist[i];
void *ptr = get_fn(fn_ctx, fn->name);
if (!ptr) {
all_loaded = false;
mp_warn(log, "Required function '%s' not "
"found for %s OpenGL %d.%d.\n", fn->name,
section->extension ? section->extension : "builtin",
MPGL_VER_GET_MAJOR(ver_core),
MPGL_VER_GET_MINOR(ver_core));
if (must_exist)
goto error;
break;
}
assert(i < MAX_FN_COUNT);
loaded[i] = ptr;
}
if (all_loaded) {
gl->mpgl_caps |= section->provides;
for (int i = 0; fnlist && fnlist[i].name; i++) {
const struct gl_function *fn = &fnlist[i];
void **funcptr = (void**)(((char*)gl) + fn->offset);
if (loaded[i])
*funcptr = loaded[i];
}
mp_verbose(log, "Loaded functions for %d/%s.\n", ver_core,
section->extension ? section->extension : "builtin");
}
}
gl->glsl_version = 0;
if (gl->es) {
if (gl->es >= 200)
gl->glsl_version = 100;
if (gl->es >= 300)
gl->glsl_version = 300;
} else {
gl->glsl_version = 110;
int glsl_major = 0, glsl_minor = 0;
if (shader && sscanf(shader, "%d.%d", &glsl_major, &glsl_minor) == 2)
gl->glsl_version = glsl_major * 100 + glsl_minor;
// GLSL 400 defines "sample" as keyword - breaks custom shaders.
gl->glsl_version = MPMIN(gl->glsl_version, 330);
}
if (is_software_gl(gl)) {
gl->mpgl_caps |= MPGL_CAP_SW;
mp_verbose(log, "Detected suspected software renderer.\n");
}
// Detect 16F textures that work with GL_LINEAR filtering.
if ((!gl->es && (gl->version >= 300 || check_ext(gl, "GL_ARB_texture_float"))) ||
(gl->es && (gl->version >= 310 || check_ext(gl, "GL_OES_texture_half_float_linear"))))
{
mp_verbose(log, "Filterable half-float textures supported.\n");
gl->mpgl_caps |= MPGL_CAP_FLOAT_TEX;
}
// Provided for simpler handling if no framebuffer support is available.
if (!gl->BindFramebuffer)
gl->BindFramebuffer = &dummy_glBindFramebuffer;
return;
error:
gl->version = 0;
gl->es = 0;
gl->mpgl_caps = 0;
}
static void *get_procaddr_wrapper(void *ctx, const char *name)
{
void *(*getProcAddress)(const GLubyte *) = ctx;
return getProcAddress ? getProcAddress((const GLubyte*)name) : NULL;
}
void mpgl_load_functions(GL *gl, void *(*getProcAddress)(const GLubyte *),
const char *ext2, struct mp_log *log)
{
mpgl_load_functions2(gl, get_procaddr_wrapper, getProcAddress, ext2, log);
}
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