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mpv/video/out/gl_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.
*/
/**
* \file gl_common.c
* \brief OpenGL helper functions used by vo_gl.c and vo_gl2.c
*/
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <math.h>
#include <assert.h>
#include "talloc.h"
#include "gl_common.h"
#include "common/common.h"
#include "options/options.h"
#include "options/m_option.h"
struct feature {
int id;
const char *name;
};
static const struct feature features[] = {
{MPGL_CAP_FB, "Framebuffers"},
{MPGL_CAP_VAO, "VAOs"},
{MPGL_CAP_FLOAT_TEX, "Float textures"},
{MPGL_CAP_TEX_RG, "RG textures"},
{MPGL_CAP_1D_TEX, "1D textures"},
{MPGL_CAP_3D_TEX, "3D textures"},
{MPGL_CAP_DEBUG, "debugging extensions"},
{MPGL_CAP_SW, "suspected software renderer"},
{0},
};
// 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_removed; // removed as required function (no replacement)
int ver_es_core; // introduced as required GL ES function
int ver_es_removed; // removed as required function (no replacement)
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(GetBooleanv),
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 | MPGL_CAP_3D_TEX,
.functions = (const struct gl_function[]) {
DEF_FN(DrawBuffer),
DEF_FN(GetTexLevelParameteriv),
DEF_FN(MapBuffer),
DEF_FN(ReadBuffer),
DEF_FN(TexImage1D),
DEF_FN(TexImage3D),
DEF_FN(UnmapBuffer),
{0}
},
},
// GL 3.0+ and ES 3.x core only functions.
{
.ver_core = 300,
.ver_es_core = 300,
.provides = MPGL_CAP_3D_TEX,
.functions = (const struct gl_function[]) {
DEF_FN(GetStringi),
// for ES 3.0
DEF_FN(GetTexLevelParameteriv),
DEF_FN(ReadBuffer),
DEF_FN(UnmapBuffer),
{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 = 300,
.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}
}
},
// Float textures, extension in GL 2.x, core in GL 3.x core.
{
.ver_core = 300,
.ver_es_core = 300,
.extension = "GL_ARB_texture_float",
.provides = MPGL_CAP_FLOAT_TEX,
},
// 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,
},
// 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}
},
},
// 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}
},
},
};
#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);
// Note: This code doesn't handle CONTEXT_FORWARD_COMPATIBLE_BIT_ARB
// on OpenGL 3.0 correctly. Apparently there's no way to detect this
// situation, because GL_ARB_compatibility is specified only for 3.1
// and above.
bool has_legacy = false;
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);
if (strcmp(ext, "GL_ARB_compatibility") == 0)
has_legacy = true;
}
// This version doesn't have GL_ARB_compatibility yet, and always
// includes legacy (except with CONTEXT_FORWARD_COMPATIBLE_BIT_ARB).
if (gl->version == 300)
has_legacy = true;
} else {
const char *ext = (char*)gl->GetString(GL_EXTENSIONS);
gl->extensions = talloc_asprintf_append(gl->extensions, " %s", ext);
has_legacy = true;
}
if (gl->es)
has_legacy = false;
if (has_legacy)
mp_verbose(log, "OpenGL legacy compat. found.\n");
mp_dbg(log, "Combined OpenGL extensions string:\n%s\n", gl->extensions);
for (int n = 0; n < sizeof(gl_functions) / sizeof(gl_functions[0]); 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;
int ver_removed = gl->es ? section->ver_es_removed : section->ver_removed;
// With has_legacy, the legacy functions are still available, and
// functions are never actually removed. (E.g. the context could be at
// version >= 3.0, but functions like glBegin still exist and work.)
if (!has_legacy && ver_removed && version >= ver_removed)
continue;
// 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) {
gl->mpgl_caps = 0;
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];
}
}
}
gl->glsl_version = 0;
if (gl->es) {
if (gl->es >= 200)
gl->glsl_version = 100;
if (gl->es >= 300)
gl->glsl_version = 300;
} else {
if (gl->version >= 200)
gl->glsl_version = 110;
if (gl->version >= 210)
gl->glsl_version = 120;
if (gl->version >= 300)
gl->glsl_version = 130;
// Specifically needed for OSX (normally we request 3.0 contexts only, but
// OSX always creates 3.2 contexts when requesting a core context).
if (gl->version >= 320)
gl->glsl_version = 150;
}
if (is_software_gl(gl))
gl->mpgl_caps |= MPGL_CAP_SW;
if (gl->mpgl_caps) {
mp_verbose(log, "Detected OpenGL features:\n");
for (const struct feature *f = &features[0]; f->id; f++) {
if ((f->id & gl->mpgl_caps))
mp_verbose(log, " - %s\n", f->name);
}
}
// 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);
}
typedef void (*MPGLSetBackendFn)(MPGLContext *ctx);
struct backend {
const char *name;
MPGLSetBackendFn init;
};
static const struct backend backends[] = {
#if HAVE_RPI_GLES
{"rpi", mpgl_set_backend_rpi},
#endif
#if HAVE_GL_COCOA
{"cocoa", mpgl_set_backend_cocoa},
#endif
#if HAVE_GL_WIN32
{"win", mpgl_set_backend_w32},
#endif
//Add the wayland backend before x11, in order to probe for a wayland-server before a x11-server and avoid using xwayland
#if HAVE_GL_WAYLAND
{"wayland", mpgl_set_backend_wayland},
#endif
#if HAVE_GL_X11
{"x11", mpgl_set_backend_x11},
{"x11es", mpgl_set_backend_x11es},
#endif
#if HAVE_EGL_X11
{"x11egl", mpgl_set_backend_x11egl},
{"x11egles", mpgl_set_backend_x11egles},
#endif
{0}
};
int mpgl_find_backend(const char *name)
{
if (name == NULL || strcmp(name, "auto") == 0)
return -1;
for (const struct backend *entry = backends; entry->name; entry++) {
if (strcmp(entry->name, name) == 0)
return entry - backends;
}
return -2;
}
int mpgl_validate_backend_opt(struct mp_log *log, const struct m_option *opt,
struct bstr name, struct bstr param)
{
if (bstr_equals0(param, "help")) {
mp_info(log, "OpenGL windowing backends:\n");
mp_info(log, " auto (autodetect)\n");
for (const struct backend *entry = backends; entry->name; entry++)
mp_info(log, " %s\n", entry->name);
return M_OPT_EXIT - 1;
}
char s[20];
snprintf(s, sizeof(s), "%.*s", BSTR_P(param));
return mpgl_find_backend(s) >= -1 ? 1 : M_OPT_INVALID;
}
static MPGLContext *init_backend(struct vo *vo, MPGLSetBackendFn set_backend,
bool probing)
{
MPGLContext *ctx = talloc_ptrtype(NULL, ctx);
*ctx = (MPGLContext) {
.gl = talloc_zero(ctx, GL),
.vo = vo,
};
bool old_probing = vo->probing;
vo->probing = probing; // hack; kill it once backends are separate
set_backend(ctx);
if (!ctx->vo_init(vo)) {
talloc_free(ctx);
ctx = NULL;
}
vo->probing = old_probing;
return ctx;
}
static MPGLContext *mpgl_create(struct vo *vo, const char *backend_name)
{
MPGLContext *ctx = NULL;
int index = mpgl_find_backend(backend_name);
if (index == -1) {
for (const struct backend *entry = backends; entry->name; entry++) {
ctx = init_backend(vo, entry->init, true);
if (ctx)
break;
}
} else if (index >= 0) {
ctx = init_backend(vo, backends[index].init, false);
}
return ctx;
}
// Create a VO window and create a GL context on it.
// vo_flags: passed to the backend's create window function
MPGLContext *mpgl_init(struct vo *vo, const char *backend_name, int vo_flags)
{
MPGLContext *ctx = mpgl_create(vo, backend_name);
if (!ctx)
goto cleanup;
ctx->requested_gl_version = 300;
if (!ctx->config_window(ctx, vo_flags | VOFLAG_HIDDEN))
goto cleanup;
if (!ctx->gl->version && !ctx->gl->es)
goto cleanup;
if (ctx->gl->es && vo->probing) {
MP_INFO(ctx->vo, "Skipping experimental GLES support (use --vo=opengl).\n");
goto cleanup;
}
if (ctx->gl->mpgl_caps & MPGL_CAP_SW) {
MP_WARN(ctx->vo, "Suspected software renderer or indirect context.\n");
if (vo->probing)
goto cleanup;
}
ctx->gl->debug_context = !!(vo_flags & VOFLAG_GL_DEBUG);
return ctx;
cleanup:
mpgl_uninit(ctx);
return NULL;
}
// flags: passed to the backend function
bool mpgl_reconfig_window(struct MPGLContext *ctx, int vo_flags)
{
return ctx->config_window(ctx, vo_flags);
}
void mpgl_uninit(MPGLContext *ctx)
{
if (ctx) {
ctx->releaseGlContext(ctx);
ctx->vo_uninit(ctx->vo);
}
talloc_free(ctx);
}
void mpgl_lock(MPGLContext *ctx)
{
if (ctx->set_current)
ctx->set_current(ctx, true);
}
void mpgl_unlock(MPGLContext *ctx)
{
if (ctx->set_current)
ctx->set_current(ctx, false);
}
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