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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 MPlayer.
*
* MPlayer 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.
*
* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* 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 <ctype.h>
#include <stdbool.h>
#include <math.h>
#include <assert.h>
#include "talloc.h"
#include "gl_common.h"
#include "core/options.h"
#include "sub/sub.h"
#include "bitmap_packer.h"
//! \defgroup glgeneral OpenGL general helper functions
// GLU has this as gluErrorString (we don't use GLU, as it is legacy-OpenGL)
static const char *gl_error_to_string(GLenum error)
{
switch (error) {
case GL_INVALID_ENUM: return "INVALID_ENUM";
case GL_INVALID_VALUE: return "INVALID_VALUE";
case GL_INVALID_OPERATION: return "INVALID_OPERATION";
case GL_INVALID_FRAMEBUFFER_OPERATION:
return "INVALID_FRAMEBUFFER_OPERATION";
case GL_OUT_OF_MEMORY: return "OUT_OF_MEMORY";
default: return "unknown";
}
}
void glCheckError(GL *gl, const char *info)
{
for (;;) {
GLenum error = gl->GetError();
if (error == GL_NO_ERROR)
break;
mp_msg(MSGT_VO, MSGL_ERR, "[gl] %s: OpenGL error %s.\n", info,
gl_error_to_string(error));
}
}
//! \defgroup glcontext OpenGL context management helper functions
//! \defgroup gltexture OpenGL texture handling helper functions
//! \defgroup glconversion OpenGL conversion helper functions
/**
* \brief adjusts the GL_UNPACK_ALIGNMENT to fit the stride.
* \param stride number of bytes per line for which alignment should fit.
* \ingroup glgeneral
*/
void glAdjustAlignment(GL *gl, int stride)
{
GLint gl_alignment;
if (stride % 8 == 0)
gl_alignment = 8;
else if (stride % 4 == 0)
gl_alignment = 4;
else if (stride % 2 == 0)
gl_alignment = 2;
else
gl_alignment = 1;
gl->PixelStorei(GL_UNPACK_ALIGNMENT, gl_alignment);
gl->PixelStorei(GL_PACK_ALIGNMENT, gl_alignment);
}
struct feature {
int id;
const char *name;
};
static const struct feature features[] = {
{MPGL_CAP_GL, "Basic OpenGL"},
{MPGL_CAP_GL_LEGACY, "Legacy OpenGL"},
{MPGL_CAP_GL2, "OpenGL 2.0"},
{MPGL_CAP_GL21, "OpenGL 2.1"},
{MPGL_CAP_GL3, "OpenGL 3.0"},
{MPGL_CAP_FB, "Framebuffers"},
{MPGL_CAP_VAO, "VAOs"},
{MPGL_CAP_SRGB_TEX, "sRGB textures"},
{MPGL_CAP_SRGB_FB, "sRGB framebuffers"},
{MPGL_CAP_FLOAT_TEX, "Float textures"},
{MPGL_CAP_TEX_RG, "RG textures"},
{MPGL_CAP_NO_SW, "NO_SW"},
{0},
};
static void list_features(int set, int msgl, bool invert)
{
for (const struct feature *f = &features[0]; f->id; f++) {
if (invert == !(f->id & set))
mp_msg(MSGT_VO, msgl, " [%s]", f->name);
}
mp_msg(MSGT_VO, msgl, "\n");
}
// 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;
}
#ifdef HAVE_LIBDL
#include <dlfcn.h>
#endif
void *mp_getdladdr(const char *s)
{
void *ret = NULL;
#ifdef HAVE_LIBDL
void *handle = dlopen(NULL, RTLD_LAZY);
if (!handle)
return NULL;
ret = dlsym(handle, s);
dlclose(handle);
#endif
return ret;
}
#define FN_OFFS(name) offsetof(GL, name)
// Define the function with a "hard" reference to the function as fallback.
// (This requires linking with a compatible OpenGL library.)
#define DEF_FN_HARD(name) {FN_OFFS(name), {"gl" # name}, gl ## name}
#define DEF_FN(name) {FN_OFFS(name), {"gl" # name}}
#define DEF_FN_NAMES(name, ...) {FN_OFFS(name), {__VA_ARGS__}}
struct gl_function {
ptrdiff_t offset;
char *funcnames[7];
void *fallback;
};
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)
bool partial_ok; // loading only some functions is ok
struct gl_function *functions;
};
#define MAX_FN_COUNT 50 // max functions per gl_functions section
struct gl_functions gl_functions[] = {
// GL functions which are always available anywhere at least since 1.1
{
.ver_core = MPGL_VER(1, 1),
.provides = MPGL_CAP_GL,
.functions = (struct gl_function[]) {
DEF_FN_HARD(Viewport),
DEF_FN_HARD(Clear),
DEF_FN_HARD(GenTextures),
DEF_FN_HARD(DeleteTextures),
DEF_FN_HARD(TexEnvi),
DEF_FN_HARD(ClearColor),
DEF_FN_HARD(Enable),
DEF_FN_HARD(Disable),
DEF_FN_HARD(DrawBuffer),
DEF_FN_HARD(DepthMask),
DEF_FN_HARD(BlendFunc),
DEF_FN_HARD(Flush),
DEF_FN_HARD(Finish),
DEF_FN_HARD(PixelStorei),
DEF_FN_HARD(TexImage1D),
DEF_FN_HARD(TexImage2D),
DEF_FN_HARD(TexSubImage2D),
DEF_FN_HARD(GetTexImage),
DEF_FN_HARD(TexParameteri),
DEF_FN_HARD(TexParameterf),
DEF_FN_HARD(TexParameterfv),
DEF_FN_HARD(GetIntegerv),
DEF_FN_HARD(GetBooleanv),
DEF_FN_HARD(ColorMask),
DEF_FN_HARD(ReadPixels),
DEF_FN_HARD(ReadBuffer),
DEF_FN_HARD(DrawArrays),
DEF_FN_HARD(GetString),
DEF_FN_HARD(GetError),
DEF_FN_HARD(GetTexLevelParameteriv),
{0}
},
},
// GL 2.0-3.x functions
{
.ver_core = MPGL_VER(2, 0),
.provides = MPGL_CAP_GL2,
.functions = (struct gl_function[]) {
DEF_FN(GenBuffers),
DEF_FN(DeleteBuffers),
DEF_FN(BindBuffer),
DEF_FN(MapBuffer),
DEF_FN(UnmapBuffer),
DEF_FN(BufferData),
DEF_FN(ActiveTexture),
DEF_FN(BindTexture),
DEF_FN(GetAttribLocation),
DEF_FN(EnableVertexAttribArray),
DEF_FN(DisableVertexAttribArray),
DEF_FN(VertexAttribPointer),
DEF_FN(UseProgram),
DEF_FN(GetUniformLocation),
DEF_FN(CompileShader),
DEF_FN(CreateProgram),
DEF_FN(CreateShader),
DEF_FN(ShaderSource),
DEF_FN(LinkProgram),
DEF_FN(AttachShader),
DEF_FN(DeleteShader),
DEF_FN(DeleteProgram),
DEF_FN(GetShaderInfoLog),
DEF_FN(GetShaderiv),
DEF_FN(GetProgramInfoLog),
DEF_FN(GetProgramiv),
DEF_FN(BindAttribLocation),
DEF_FN(Uniform1f),
DEF_FN(Uniform2f),
DEF_FN(Uniform3f),
DEF_FN(Uniform1i),
DEF_FN(UniformMatrix2fv),
DEF_FN(UniformMatrix3fv),
DEF_FN(TexImage3D),
{0},
},
},
// GL 2.1-3.x functions (also: GLSL 120 shaders)
{
.ver_core = MPGL_VER(2, 1),
.provides = MPGL_CAP_GL21,
.functions = (struct gl_function[]) {
DEF_FN(UniformMatrix4x3fv),
{0}
},
},
// GL 3.x core only functions.
{
.ver_core = MPGL_VER(3, 0),
.provides = MPGL_CAP_GL3 | MPGL_CAP_SRGB_TEX | MPGL_CAP_SRGB_FB,
.functions = (struct gl_function[]) {
DEF_FN(GetStringi),
{0}
},
},
// Framebuffers, extension in GL 2.x, core in GL 3.x core.
{
.ver_core = MPGL_VER(3, 0),
.extension = "GL_ARB_framebuffer_object",
.provides = MPGL_CAP_FB,
.functions = (struct gl_function[]) {
DEF_FN(BindFramebuffer),
DEF_FN(GenFramebuffers),
DEF_FN(DeleteFramebuffers),
DEF_FN(CheckFramebufferStatus),
DEF_FN(FramebufferTexture2D),
{0}
},
},
// Framebuffers, alternative extension name.
{
.ver_removed = MPGL_VER(3, 0), // don't touch these fn names in 3.x
.extension = "GL_EXT_framebuffer_object",
.provides = MPGL_CAP_FB,
.functions = (struct gl_function[]) {
DEF_FN_NAMES(BindFramebuffer, "glBindFramebufferEXT"),
DEF_FN_NAMES(GenFramebuffers, "glGenFramebuffersEXT"),
DEF_FN_NAMES(DeleteFramebuffers, "glDeleteFramebuffersEXT"),
DEF_FN_NAMES(CheckFramebufferStatus, "glCheckFramebufferStatusEXT"),
DEF_FN_NAMES(FramebufferTexture2D, "glFramebufferTexture2DEXT"),
{0}
},
},
// VAOs, extension in GL 2.x, core in GL 3.x core.
{
.ver_core = MPGL_VER(3, 0),
.extension = "GL_ARB_vertex_array_object",
.provides = MPGL_CAP_VAO,
.functions = (struct gl_function[]) {
DEF_FN(GenVertexArrays),
DEF_FN(BindVertexArray),
DEF_FN(DeleteVertexArrays),
{0}
}
},
// sRGB textures, extension in GL 2.x, core in GL 3.x core.
{
.ver_core = MPGL_VER(3, 0),
.extension = "GL_EXT_texture_sRGB",
.provides = MPGL_CAP_SRGB_TEX,
.functions = (struct gl_function[]) {{0}},
},
// sRGB framebuffers, extension in GL 2.x, core in GL 3.x core.
{
.ver_core = MPGL_VER(3, 0),
.extension = "GL_EXT_framebuffer_sRGB",
.provides = MPGL_CAP_SRGB_FB,
.functions = (struct gl_function[]) {{0}},
},
// Float textures, extension in GL 2.x, core in GL 3.x core.
{
.ver_core = MPGL_VER(3, 0),
.extension = "GL_ARB_texture_float",
.provides = MPGL_CAP_FLOAT_TEX,
.functions = (struct gl_function[]) {{0}},
},
// GL_RED / GL_RG textures, extension in GL 2.x, core in GL 3.x core.
{
.ver_core = MPGL_VER(3, 0),
.extension = "GL_ARB_texture_rg",
.provides = MPGL_CAP_TEX_RG,
.functions = (struct gl_function[]) {{0}},
},
// Swap control, always an OS specific extension
{
.extension = "_swap_control",
.functions = (struct gl_function[]) {
DEF_FN_NAMES(SwapInterval, "glXSwapIntervalSGI", "glXSwapInterval",
"wglSwapIntervalSGI", "wglSwapInterval",
"wglSwapIntervalEXT"),
{0}
},
},
// GL legacy functions in GL 1.x - 2.x, removed from GL 3.x
{
.ver_core = MPGL_VER(1, 1),
.ver_removed = MPGL_VER(3, 0),
.provides = MPGL_CAP_GL_LEGACY,
.functions = (struct gl_function[]) {
DEF_FN_HARD(Begin),
DEF_FN_HARD(End),
DEF_FN_HARD(MatrixMode),
DEF_FN_HARD(LoadIdentity),
DEF_FN_HARD(Translated),
DEF_FN_HARD(Scaled),
DEF_FN_HARD(Ortho),
DEF_FN_HARD(PushMatrix),
DEF_FN_HARD(PopMatrix),
DEF_FN_HARD(GenLists),
DEF_FN_HARD(DeleteLists),
DEF_FN_HARD(NewList),
DEF_FN_HARD(EndList),
DEF_FN_HARD(CallList),
DEF_FN_HARD(CallLists),
DEF_FN_HARD(Color4ub),
DEF_FN_HARD(Color4f),
DEF_FN_HARD(TexCoord2f),
DEF_FN_HARD(TexCoord2fv),
DEF_FN_HARD(Vertex2f),
DEF_FN_HARD(VertexPointer),
DEF_FN_HARD(ColorPointer),
DEF_FN_HARD(TexCoordPointer),
DEF_FN_HARD(EnableClientState),
DEF_FN_HARD(DisableClientState),
{0}
},
},
// Loading of old extensions, which are later added to GL 2.0.
// NOTE: actually we should be checking the extension strings: the OpenGL
// library could provide an entry point, but not implement it.
// But the previous code didn't do that, and nobody ever complained.
{
.ver_removed = MPGL_VER(2, 1),
.partial_ok = true,
.functions = (struct gl_function[]) {
DEF_FN_NAMES(GenBuffers, "glGenBuffers", "glGenBuffersARB"),
DEF_FN_NAMES(DeleteBuffers, "glDeleteBuffers", "glDeleteBuffersARB"),
DEF_FN_NAMES(BindBuffer, "glBindBuffer", "glBindBufferARB"),
DEF_FN_NAMES(MapBuffer, "glMapBuffer", "glMapBufferARB"),
DEF_FN_NAMES(UnmapBuffer, "glUnmapBuffer", "glUnmapBufferARB"),
DEF_FN_NAMES(BufferData, "glBufferData", "glBufferDataARB"),
DEF_FN_NAMES(ActiveTexture, "glActiveTexture", "glActiveTextureARB"),
DEF_FN_NAMES(BindTexture, "glBindTexture", "glBindTextureARB", "glBindTextureEXT"),
DEF_FN_NAMES(MultiTexCoord2f, "glMultiTexCoord2f", "glMultiTexCoord2fARB"),
DEF_FN_NAMES(TexImage3D, "glTexImage3D"),
{0}
},
},
// Ancient ARB shaders.
{
.extension = "_program",
.ver_removed = MPGL_VER(3, 0),
.functions = (struct gl_function[]) {
DEF_FN_NAMES(GenPrograms, "glGenProgramsARB"),
DEF_FN_NAMES(DeletePrograms, "glDeleteProgramsARB"),
DEF_FN_NAMES(BindProgram, "glBindProgramARB"),
DEF_FN_NAMES(ProgramString, "glProgramStringARB"),
DEF_FN_NAMES(GetProgramivARB, "glGetProgramivARB"),
DEF_FN_NAMES(ProgramEnvParameter4f, "glProgramEnvParameter4fARB"),
{0}
},
},
// Ancient ATI extensions.
{
.extension = "ATI_fragment_shader",
.ver_removed = MPGL_VER(3, 0),
.functions = (struct gl_function[]) {
DEF_FN_NAMES(BeginFragmentShader, "glBeginFragmentShaderATI"),
DEF_FN_NAMES(EndFragmentShader, "glEndFragmentShaderATI"),
DEF_FN_NAMES(SampleMap, "glSampleMapATI"),
DEF_FN_NAMES(ColorFragmentOp2, "glColorFragmentOp2ATI"),
DEF_FN_NAMES(ColorFragmentOp3, "glColorFragmentOp3ATI"),
DEF_FN_NAMES(SetFragmentShaderConstant, "glSetFragmentShaderConstantATI"),
{0}
},
},
};
#undef FN_OFFS
#undef DEF_FN_HARD
#undef DEF_FN
#undef DEF_FN_NAMES
// 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
// 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_functions(GL *gl, void *(*getProcAddress)(const GLubyte *),
const char *ext2)
{
talloc_free_children(gl);
*gl = (GL) {
.extensions = talloc_strdup(gl, ext2 ? ext2 : ""),
};
if (!getProcAddress)
getProcAddress = (void *)mp_getdladdr;
gl->GetString = getProcAddress("glGetString");
if (!gl->GetString)
gl->GetString = glGetString;
GLint major = 0, minor = 0;
const char *version = gl->GetString(GL_VERSION);
sscanf(version, "%d.%d", &major, &minor);
gl->version = MPGL_VER(major, minor);
mp_msg(MSGT_VO, MSGL_V, "[gl] Detected OpenGL %d.%d.\n", major, minor);
mp_msg(MSGT_VO, MSGL_V, "GL_VENDOR='%s'\n", gl->GetString(GL_VENDOR));
mp_msg(MSGT_VO, MSGL_V, "GL_RENDERER='%s'\n", gl->GetString(GL_RENDERER));
mp_msg(MSGT_VO, MSGL_V, "GL_VERSION='%s'\n", gl->GetString(GL_VERSION));
mp_msg(MSGT_VO, MSGL_V, "GL_SHADING_LANGUAGE_VERSION='%s'\n",
gl->GetString(GL_SHADING_LANGUAGE_VERSION));
// 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 >= MPGL_VER(3, 0)) {
gl->GetStringi = getProcAddress("glGetStringi");
gl->GetIntegerv = getProcAddress("glGetIntegerv");
if (!(gl->GetStringi && gl->GetIntegerv))
return;
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 == MPGL_VER(3, 0))
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 (has_legacy)
mp_msg(MSGT_VO, MSGL_V, "[gl] OpenGL legacy compat. found.\n");
mp_msg(MSGT_VO, MSGL_DBG2, "[gl] Combined OpenGL extensions string:\n%s\n",
gl->extensions);
for (int n = 0; n < sizeof(gl_functions) / sizeof(gl_functions[0]); n++) {
struct gl_functions *section = &gl_functions[n];
// 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 && section->ver_removed &&
gl->version >= section->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;
if (section->ver_core)
exists = gl->version >= section->ver_core;
if (section->extension && strstr(gl->extensions, section->extension))
exists = true;
if (section->partial_ok)
exists = true; // possibly
if (!exists)
continue;
void *loaded[MAX_FN_COUNT] = {0};
bool all_loaded = true;
for (int i = 0; section->functions[i].funcnames[0]; i++) {
struct gl_function *fn = &section->functions[i];
void *ptr = NULL;
for (int x = 0; fn->funcnames[x]; x++) {
ptr = getProcAddress((const GLubyte *)fn->funcnames[x]);
if (ptr)
break;
}
if (!ptr)
ptr = fn->fallback;
if (!ptr) {
all_loaded = false;
if (!section->partial_ok) {
mp_msg(MSGT_VO, MSGL_V, "[gl] Required function '%s' not "
"found for %s/%d.%d.\n", fn->funcnames[0],
section->extension ? section->extension : "native",
MPGL_VER_GET_MAJOR(section->ver_core),
MPGL_VER_GET_MINOR(section->ver_core));
break;
}
}
assert(i < MAX_FN_COUNT);
loaded[i] = ptr;
}
if (all_loaded || section->partial_ok) {
gl->mpgl_caps |= section->provides;
for (int i = 0; section->functions[i].funcnames[0]; i++) {
struct gl_function *fn = &section->functions[i];
void **funcptr = (void**)(((char*)gl) + fn->offset);
if (loaded[i])
*funcptr = loaded[i];
}
}
}
gl->glsl_version = 0;
if (gl->version >= MPGL_VER(2, 0))
gl->glsl_version = 110;
if (gl->version >= MPGL_VER(2, 1))
gl->glsl_version = 120;
if (gl->version >= MPGL_VER(3, 0))
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 >= MPGL_VER(3, 2))
gl->glsl_version = 150;
if (!is_software_gl(gl))
gl->mpgl_caps |= MPGL_CAP_NO_SW;
mp_msg(MSGT_VO, MSGL_V, "[gl] Detected OpenGL features:");
list_features(gl->mpgl_caps, MSGL_V, false);
}
/**
* \brief return the number of bytes per pixel for the given format
* \param format OpenGL format
* \param type OpenGL type
* \return bytes per pixel
* \ingroup glgeneral
*
* Does not handle all possible variants, just those used by MPlayer
*/
int glFmt2bpp(GLenum format, GLenum type)
{
int component_size = 0;
switch (type) {
case GL_UNSIGNED_BYTE_3_3_2:
case GL_UNSIGNED_BYTE_2_3_3_REV:
return 1;
case GL_UNSIGNED_SHORT_5_5_5_1:
case GL_UNSIGNED_SHORT_1_5_5_5_REV:
case GL_UNSIGNED_SHORT_5_6_5:
case GL_UNSIGNED_SHORT_5_6_5_REV:
return 2;
case GL_UNSIGNED_BYTE:
component_size = 1;
break;
case GL_UNSIGNED_SHORT:
component_size = 2;
break;
}
switch (format) {
case GL_LUMINANCE:
case GL_ALPHA:
return component_size;
case GL_YCBCR_MESA:
return 2;
case GL_RGB:
case GL_BGR:
return 3 * component_size;
case GL_RGBA:
case GL_BGRA:
return 4 * component_size;
case GL_RED:
return component_size;
case GL_RG:
case GL_LUMINANCE_ALPHA:
return 2 * component_size;
}
abort(); // unknown
}
/**
* \brief upload a texture, handling things like stride and slices
* \param target texture target, usually GL_TEXTURE_2D
* \param format OpenGL format of data
* \param type OpenGL type of data
* \param dataptr data to upload
* \param stride data stride
* \param x x offset in texture
* \param y y offset in texture
* \param w width of the texture part to upload
* \param h height of the texture part to upload
* \param slice height of an upload slice, 0 for all at once
* \ingroup gltexture
*/
void glUploadTex(GL *gl, GLenum target, GLenum format, GLenum type,
const void *dataptr, int stride,
int x, int y, int w, int h, int slice)
{
const uint8_t *data = dataptr;
int y_max = y + h;
if (w <= 0 || h <= 0)
return;
if (slice <= 0)
slice = h;
if (stride < 0) {
data += (h - 1) * stride;
stride = -stride;
}
// this is not always correct, but should work for MPlayer
glAdjustAlignment(gl, stride);
gl->PixelStorei(GL_UNPACK_ROW_LENGTH, stride / glFmt2bpp(format, type));
for (; y + slice <= y_max; y += slice) {
gl->TexSubImage2D(target, 0, x, y, w, slice, format, type, data);
data += stride * slice;
}
if (y < y_max)
gl->TexSubImage2D(target, 0, x, y, w, y_max - y, format, type, data);
}
// Like glUploadTex, but upload a byte array with all elements set to val.
// If scratch is not NULL, points to a resizeable talloc memory block than can
// be freely used by the function (for avoiding temporary memory allocations).
void glClearTex(GL *gl, GLenum target, GLenum format, GLenum type,
int x, int y, int w, int h, uint8_t val, void **scratch)
{
int bpp = glFmt2bpp(format, type);
int stride = w * bpp;
int size = h * stride;
if (size < 1)
return;
void *data = scratch ? *scratch : NULL;
if (talloc_get_size(data) < size)
data = talloc_realloc(NULL, data, char *, size);
memset(data, val, size);
glAdjustAlignment(gl, stride);
gl->PixelStorei(GL_UNPACK_ROW_LENGTH, w);
gl->TexSubImage2D(target, 0, x, y, w, h, format, type, data);
if (scratch) {
*scratch = data;
} else {
talloc_free(data);
}
}
/**
* \brief download a texture, handling things like stride and slices
* \param target texture target, usually GL_TEXTURE_2D
* \param format OpenGL format of data
* \param type OpenGL type of data
* \param dataptr destination memory for download
* \param stride data stride (must be positive)
* \ingroup gltexture
*/
void glDownloadTex(GL *gl, GLenum target, GLenum format, GLenum type,
void *dataptr, int stride)
{
// this is not always correct, but should work for MPlayer
glAdjustAlignment(gl, stride);
gl->PixelStorei(GL_PACK_ROW_LENGTH, stride / glFmt2bpp(format, type));
gl->GetTexImage(target, 0, format, type, dataptr);
}
void glEnable3DLeft(GL *gl, int type)
{
GLint buffer;
switch (type) {
case GL_3D_RED_CYAN:
gl->ColorMask(GL_TRUE, GL_FALSE, GL_FALSE, GL_FALSE);
break;
case GL_3D_GREEN_MAGENTA:
gl->ColorMask(GL_FALSE, GL_TRUE, GL_FALSE, GL_FALSE);
break;
case GL_3D_QUADBUFFER:
gl->GetIntegerv(GL_DRAW_BUFFER, &buffer);
switch (buffer) {
case GL_FRONT:
case GL_FRONT_LEFT:
case GL_FRONT_RIGHT:
buffer = GL_FRONT_LEFT;
break;
case GL_BACK:
case GL_BACK_LEFT:
case GL_BACK_RIGHT:
buffer = GL_BACK_LEFT;
break;
}
gl->DrawBuffer(buffer);
break;
}
}
void glEnable3DRight(GL *gl, int type)
{
GLint buffer;
switch (type) {
case GL_3D_RED_CYAN:
gl->ColorMask(GL_FALSE, GL_TRUE, GL_TRUE, GL_FALSE);
break;
case GL_3D_GREEN_MAGENTA:
gl->ColorMask(GL_TRUE, GL_FALSE, GL_TRUE, GL_FALSE);
break;
case GL_3D_QUADBUFFER:
gl->GetIntegerv(GL_DRAW_BUFFER, &buffer);
switch (buffer) {
case GL_FRONT:
case GL_FRONT_LEFT:
case GL_FRONT_RIGHT:
buffer = GL_FRONT_RIGHT;
break;
case GL_BACK:
case GL_BACK_LEFT:
case GL_BACK_RIGHT:
buffer = GL_BACK_RIGHT;
break;
}
gl->DrawBuffer(buffer);
break;
}
}
void glDisable3D(GL *gl, int type)
{
GLint buffer;
switch (type) {
case GL_3D_RED_CYAN:
case GL_3D_GREEN_MAGENTA:
gl->ColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
break;
case GL_3D_QUADBUFFER:
gl->DrawBuffer(GL_BACK);
gl->GetIntegerv(GL_DRAW_BUFFER, &buffer);
switch (buffer) {
case GL_FRONT:
case GL_FRONT_LEFT:
case GL_FRONT_RIGHT:
buffer = GL_FRONT;
break;
case GL_BACK:
case GL_BACK_LEFT:
case GL_BACK_RIGHT:
buffer = GL_BACK;
break;
}
gl->DrawBuffer(buffer);
break;
}
}
mp_image_t *glGetWindowScreenshot(GL *gl)
{
GLint vp[4]; //x, y, w, h
gl->GetIntegerv(GL_VIEWPORT, vp);
mp_image_t *image = mp_image_alloc(IMGFMT_RGB24, vp[2], vp[3]);
gl->BindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
gl->PixelStorei(GL_PACK_ALIGNMENT, 1);
gl->PixelStorei(GL_PACK_ROW_LENGTH, 0);
gl->ReadBuffer(GL_FRONT);
//flip image while reading (and also avoid stride-related trouble)
for (int y = 0; y < vp[3]; y++) {
gl->ReadPixels(vp[0], vp[1] + vp[3] - y - 1, vp[2], 1,
GL_RGB, GL_UNSIGNED_BYTE,
image->planes[0] + y * image->stride[0]);
}
return image;
}
typedef void (*MPGLSetBackendFn)(MPGLContext *ctx);
struct backend {
const char *name;
MPGLSetBackendFn init;
};
static struct backend backends[] = {
#ifdef CONFIG_GL_COCOA
{"cocoa", mpgl_set_backend_cocoa},
#endif
#ifdef CONFIG_GL_WIN32
{"win", mpgl_set_backend_w32},
#endif
#ifdef CONFIG_GL_X11
{"x11", mpgl_set_backend_x11},
#endif
#ifdef CONFIG_GL_WAYLAND
{"wayland", mpgl_set_backend_wayland},
#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;
}
static MPGLContext *init_backend(struct vo *vo, MPGLSetBackendFn set_backend)
{
MPGLContext *ctx = talloc_ptrtype(NULL, ctx);
*ctx = (MPGLContext) {
.gl = talloc_zero(ctx, GL),
.vo = vo,
};
set_backend(ctx);
if (!ctx->vo_init(vo)) {
talloc_free(ctx);
ctx = NULL;
}
return ctx;
}
MPGLContext *mpgl_init(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);
if (ctx)
return ctx;
}
} else if (index >= 0) {
ctx = init_backend(vo, backends[index].init);
}
return ctx;
}
bool mpgl_config_window(struct MPGLContext *ctx, int gl_caps, uint32_t d_width,
uint32_t d_height, uint32_t flags)
{
gl_caps |= MPGL_CAP_GL;
ctx->requested_gl_version = (gl_caps & MPGL_CAP_GL_LEGACY)
? MPGL_VER(2, 1) : MPGL_VER(3, 0);
if (ctx->config_window(ctx, d_width, d_height, flags)) {
int missing = (ctx->gl->mpgl_caps & gl_caps) ^ gl_caps;
if (!missing)
return true;
mp_msg(MSGT_VO, MSGL_WARN, "[gl] Missing OpenGL features:");
list_features(missing, MSGL_WARN, false);
if (missing & MPGL_CAP_NO_SW) {
mp_msg(MSGT_VO, MSGL_WARN, "[gl] Rejecting suspected software "
"OpenGL renderer.\n");
}
}
mp_msg(MSGT_VO, MSGL_ERR, "[gl] OpenGL context creation failed!\n");
return false;
}
void mpgl_uninit(MPGLContext *ctx)
{
if (ctx) {
ctx->releaseGlContext(ctx);
ctx->vo_uninit(ctx->vo);
}
talloc_free(ctx);
}
void mpgl_set_context(MPGLContext *ctx)
{
if (ctx->set_current)
ctx->set_current(ctx, true);
}
void mpgl_unset_context(MPGLContext *ctx)
{
if (ctx->set_current)
ctx->set_current(ctx, false);
}
void mpgl_lock(MPGLContext *ctx)
{
mpgl_set_context(ctx);
}
void mpgl_unlock(MPGLContext *ctx)
{
mpgl_unset_context(ctx);
}
bool mpgl_is_thread_safe(MPGLContext *ctx)
{
return !!ctx->set_current;
}
void mp_log_source(int mod, int lev, const char *src)
{
int line = 1;
if (!src)
return;
while (*src) {
const char *end = strchr(src, '\n');
const char *next = end + 1;
if (!end)
next = end = src + strlen(src);
mp_msg(mod, lev, "[%3d] %.*s\n", line, (int)(end - src), src);
line++;
src = next;
}
}
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