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SDL/src/video/SDL_egl.c

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/*
* Simple DirectMedia Layer
* Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
#include "../SDL_internal.h"
#if SDL_VIDEO_OPENGL_EGL
#if SDL_VIDEO_DRIVER_WINDOWS || SDL_VIDEO_DRIVER_WINRT
#include "../core/windows/SDL_windows.h"
#endif
#include "SDL_sysvideo.h"
#include "SDL_egl_c.h"
#include "SDL_loadso.h"
#include "SDL_hints.h"
#ifdef EGL_KHR_create_context
/* EGL_OPENGL_ES3_BIT_KHR was added in version 13 of the extension. */
#ifndef EGL_OPENGL_ES3_BIT_KHR
#define EGL_OPENGL_ES3_BIT_KHR 0x00000040
#endif
#endif /* EGL_KHR_create_context */
#if SDL_VIDEO_DRIVER_RPI
/* Raspbian places the OpenGL ES/EGL binaries in a non standard path */
#define DEFAULT_EGL "/opt/vc/lib/libEGL.so"
#define DEFAULT_OGL_ES2 "/opt/vc/lib/libGLESv2.so"
#define DEFAULT_OGL_ES_PVR "/opt/vc/lib/libGLES_CM.so"
#define DEFAULT_OGL_ES "/opt/vc/lib/libGLESv1_CM.so"
#elif SDL_VIDEO_DRIVER_ANDROID || SDL_VIDEO_DRIVER_VIVANTE
/* Android */
#define DEFAULT_EGL "libEGL.so"
#define DEFAULT_OGL_ES2 "libGLESv2.so"
#define DEFAULT_OGL_ES_PVR "libGLES_CM.so"
#define DEFAULT_OGL_ES "libGLESv1_CM.so"
#elif SDL_VIDEO_DRIVER_WINDOWS || SDL_VIDEO_DRIVER_WINRT
/* EGL AND OpenGL ES support via ANGLE */
#define DEFAULT_EGL "libEGL.dll"
#define DEFAULT_OGL_ES2 "libGLESv2.dll"
#define DEFAULT_OGL_ES_PVR "libGLES_CM.dll"
#define DEFAULT_OGL_ES "libGLESv1_CM.dll"
#else
/* Desktop Linux */
#define DEFAULT_OGL "libGL.so.1"
#define DEFAULT_EGL "libEGL.so.1"
#define DEFAULT_OGL_ES2 "libGLESv2.so.2"
#define DEFAULT_OGL_ES_PVR "libGLES_CM.so.1"
#define DEFAULT_OGL_ES "libGLESv1_CM.so.1"
#endif /* SDL_VIDEO_DRIVER_RPI */
#define LOAD_FUNC(NAME) \
_this->egl_data->NAME = SDL_LoadFunction(_this->egl_data->dll_handle, #NAME); \
if (!_this->egl_data->NAME) \
{ \
return SDL_SetError("Could not retrieve EGL function " #NAME); \
}
/* EGL implementation of SDL OpenGL ES support */
#ifdef EGL_KHR_create_context
static int SDL_EGL_HasExtension(_THIS, const char *ext)
{
int i;
int len = 0;
size_t ext_len;
const char *exts;
const char *ext_word;
ext_len = SDL_strlen(ext);
exts = _this->egl_data->eglQueryString(_this->egl_data->egl_display, EGL_EXTENSIONS);
if (exts) {
ext_word = exts;
for (i = 0; exts[i] != 0; i++) {
if (exts[i] == ' ') {
if (ext_len == len && !SDL_strncmp(ext_word, ext, len)) {
return 1;
}
len = 0;
ext_word = &exts[i + 1];
} else {
len++;
}
}
}
return 0;
}
#endif /* EGL_KHR_create_context */
void *
SDL_EGL_GetProcAddress(_THIS, const char *proc)
{
static char procname[1024];
void *retval;
/* eglGetProcAddress is busted on Android http://code.google.com/p/android/issues/detail?id=7681 */
#if !defined(SDL_VIDEO_DRIVER_ANDROID) && !defined(SDL_VIDEO_DRIVER_MIR)
if (_this->egl_data->eglGetProcAddress) {
retval = _this->egl_data->eglGetProcAddress(proc);
if (retval) {
return retval;
}
}
#endif
retval = SDL_LoadFunction(_this->egl_data->egl_dll_handle, proc);
if (!retval && SDL_strlen(proc) <= 1022) {
procname[0] = '_';
SDL_strlcpy(procname + 1, proc, 1022);
retval = SDL_LoadFunction(_this->egl_data->egl_dll_handle, procname);
}
return retval;
}
void
SDL_EGL_UnloadLibrary(_THIS)
{
if (_this->egl_data) {
if (_this->egl_data->egl_display) {
_this->egl_data->eglTerminate(_this->egl_data->egl_display);
_this->egl_data->egl_display = NULL;
}
if (_this->egl_data->dll_handle) {
SDL_UnloadObject(_this->egl_data->dll_handle);
_this->egl_data->dll_handle = NULL;
}
if (_this->egl_data->egl_dll_handle) {
SDL_UnloadObject(_this->egl_data->egl_dll_handle);
_this->egl_data->egl_dll_handle = NULL;
}
SDL_free(_this->egl_data);
_this->egl_data = NULL;
}
}
int
SDL_EGL_LoadLibrary(_THIS, const char *egl_path, NativeDisplayType native_display)
{
void *dll_handle = NULL, *egl_dll_handle = NULL; /* The naming is counter intuitive, but hey, I just work here -- Gabriel */
char *path = NULL;
#if SDL_VIDEO_DRIVER_WINDOWS || SDL_VIDEO_DRIVER_WINRT
const char *d3dcompiler;
#endif
if (_this->egl_data) {
return SDL_SetError("OpenGL ES context already created");
}
_this->egl_data = (struct SDL_EGL_VideoData *) SDL_calloc(1, sizeof(SDL_EGL_VideoData));
if (!_this->egl_data) {
return SDL_OutOfMemory();
}
#if SDL_VIDEO_DRIVER_WINDOWS || SDL_VIDEO_DRIVER_WINRT
d3dcompiler = SDL_GetHint(SDL_HINT_VIDEO_WIN_D3DCOMPILER);
if (!d3dcompiler) {
if (WIN_IsWindowsVistaOrGreater()) {
d3dcompiler = "d3dcompiler_46.dll";
} else {
d3dcompiler = "d3dcompiler_43.dll";
}
}
if (SDL_strcasecmp(d3dcompiler, "none") != 0) {
SDL_LoadObject(d3dcompiler);
}
#endif
/* A funny thing, loading EGL.so first does not work on the Raspberry, so we load libGL* first */
path = SDL_getenv("SDL_VIDEO_GL_DRIVER");
if (path != NULL) {
egl_dll_handle = SDL_LoadObject(path);
}
if (egl_dll_handle == NULL) {
if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES) {
if (_this->gl_config.major_version > 1) {
path = DEFAULT_OGL_ES2;
egl_dll_handle = SDL_LoadObject(path);
} else {
path = DEFAULT_OGL_ES;
egl_dll_handle = SDL_LoadObject(path);
if (egl_dll_handle == NULL) {
path = DEFAULT_OGL_ES_PVR;
egl_dll_handle = SDL_LoadObject(path);
}
}
}
#ifdef DEFAULT_OGL
else {
path = DEFAULT_OGL;
egl_dll_handle = SDL_LoadObject(path);
}
#endif
}
_this->egl_data->egl_dll_handle = egl_dll_handle;
if (egl_dll_handle == NULL) {
return SDL_SetError("Could not initialize OpenGL / GLES library");
}
/* Loading libGL* in the previous step took care of loading libEGL.so, but we future proof by double checking */
if (egl_path != NULL) {
dll_handle = SDL_LoadObject(egl_path);
}
/* Try loading a EGL symbol, if it does not work try the default library paths */
if (dll_handle == NULL || SDL_LoadFunction(dll_handle, "eglChooseConfig") == NULL) {
if (dll_handle != NULL) {
SDL_UnloadObject(dll_handle);
}
path = SDL_getenv("SDL_VIDEO_EGL_DRIVER");
if (path == NULL) {
path = DEFAULT_EGL;
}
dll_handle = SDL_LoadObject(path);
if (dll_handle == NULL || SDL_LoadFunction(dll_handle, "eglChooseConfig") == NULL) {
if (dll_handle != NULL) {
SDL_UnloadObject(dll_handle);
}
return SDL_SetError("Could not load EGL library");
}
SDL_ClearError();
}
_this->egl_data->dll_handle = dll_handle;
/* Load new function pointers */
LOAD_FUNC(eglGetDisplay);
LOAD_FUNC(eglInitialize);
LOAD_FUNC(eglTerminate);
LOAD_FUNC(eglGetProcAddress);
LOAD_FUNC(eglChooseConfig);
LOAD_FUNC(eglGetConfigAttrib);
LOAD_FUNC(eglCreateContext);
LOAD_FUNC(eglDestroyContext);
LOAD_FUNC(eglCreateWindowSurface);
LOAD_FUNC(eglDestroySurface);
LOAD_FUNC(eglMakeCurrent);
LOAD_FUNC(eglSwapBuffers);
LOAD_FUNC(eglSwapInterval);
LOAD_FUNC(eglWaitNative);
LOAD_FUNC(eglWaitGL);
LOAD_FUNC(eglBindAPI);
LOAD_FUNC(eglQueryString);
#if !defined(__WINRT__)
_this->egl_data->egl_display = _this->egl_data->eglGetDisplay(native_display);
if (!_this->egl_data->egl_display) {
return SDL_SetError("Could not get EGL display");
}
if (_this->egl_data->eglInitialize(_this->egl_data->egl_display, NULL, NULL) != EGL_TRUE) {
return SDL_SetError("Could not initialize EGL");
}
#endif
_this->gl_config.driver_loaded = 1;
if (path) {
SDL_strlcpy(_this->gl_config.driver_path, path, sizeof(_this->gl_config.driver_path) - 1);
} else {
*_this->gl_config.driver_path = '\0';
}
return 0;
}
int
SDL_EGL_ChooseConfig(_THIS)
{
/* 64 seems nice. */
EGLint attribs[64];
EGLint found_configs = 0, value;
/* 128 seems even nicer here */
EGLConfig configs[128];
int i, j, best_bitdiff = -1, bitdiff;
if (!_this->egl_data) {
/* The EGL library wasn't loaded, SDL_GetError() should have info */
return -1;
}
/* Get a valid EGL configuration */
i = 0;
attribs[i++] = EGL_RED_SIZE;
attribs[i++] = _this->gl_config.red_size;
attribs[i++] = EGL_GREEN_SIZE;
attribs[i++] = _this->gl_config.green_size;
attribs[i++] = EGL_BLUE_SIZE;
attribs[i++] = _this->gl_config.blue_size;
if (_this->gl_config.alpha_size) {
attribs[i++] = EGL_ALPHA_SIZE;
attribs[i++] = _this->gl_config.alpha_size;
}
if (_this->gl_config.buffer_size) {
attribs[i++] = EGL_BUFFER_SIZE;
attribs[i++] = _this->gl_config.buffer_size;
}
attribs[i++] = EGL_DEPTH_SIZE;
attribs[i++] = _this->gl_config.depth_size;
if (_this->gl_config.stencil_size) {
attribs[i++] = EGL_STENCIL_SIZE;
attribs[i++] = _this->gl_config.stencil_size;
}
if (_this->gl_config.multisamplebuffers) {
attribs[i++] = EGL_SAMPLE_BUFFERS;
attribs[i++] = _this->gl_config.multisamplebuffers;
}
if (_this->gl_config.multisamplesamples) {
attribs[i++] = EGL_SAMPLES;
attribs[i++] = _this->gl_config.multisamplesamples;
}
if (_this->gl_config.framebuffer_srgb_capable) {
#ifdef EGL_KHR_gl_colorspace
if (SDL_EGL_HasExtension(_this, "EGL_KHR_gl_colorspace")) {
attribs[i++] = EGL_GL_COLORSPACE_KHR;
attribs[i++] = EGL_GL_COLORSPACE_SRGB_KHR;
} else
#endif
{
return SDL_SetError("EGL implementation does not support sRGB system framebuffers");
}
}
attribs[i++] = EGL_RENDERABLE_TYPE;
if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES) {
#ifdef EGL_KHR_create_context
if (_this->gl_config.major_version >= 3 &&
SDL_EGL_HasExtension(_this, "EGL_KHR_create_context")) {
attribs[i++] = EGL_OPENGL_ES3_BIT_KHR;
} else
#endif
if (_this->gl_config.major_version >= 2) {
attribs[i++] = EGL_OPENGL_ES2_BIT;
} else {
attribs[i++] = EGL_OPENGL_ES_BIT;
}
_this->egl_data->eglBindAPI(EGL_OPENGL_ES_API);
} else {
attribs[i++] = EGL_OPENGL_BIT;
_this->egl_data->eglBindAPI(EGL_OPENGL_API);
}
attribs[i++] = EGL_NONE;
if (_this->egl_data->eglChooseConfig(_this->egl_data->egl_display,
attribs,
configs, SDL_arraysize(configs),
&found_configs) == EGL_FALSE ||
found_configs == 0) {
return SDL_SetError("Couldn't find matching EGL config");
}
/* eglChooseConfig returns a number of configurations that match or exceed the requested attribs. */
/* From those, we select the one that matches our requirements more closely via a makeshift algorithm */
for (i = 0; i < found_configs; i++ ) {
bitdiff = 0;
for (j = 0; j < SDL_arraysize(attribs) - 1; j += 2) {
if (attribs[j] == EGL_NONE) {
break;
}
if ( attribs[j+1] != EGL_DONT_CARE && (
attribs[j] == EGL_RED_SIZE ||
attribs[j] == EGL_GREEN_SIZE ||
attribs[j] == EGL_BLUE_SIZE ||
attribs[j] == EGL_ALPHA_SIZE ||
attribs[j] == EGL_DEPTH_SIZE ||
attribs[j] == EGL_STENCIL_SIZE)) {
_this->egl_data->eglGetConfigAttrib(_this->egl_data->egl_display, configs[i], attribs[j], &value);
bitdiff += value - attribs[j + 1]; /* value is always >= attrib */
}
}
if (bitdiff < best_bitdiff || best_bitdiff == -1) {
_this->egl_data->egl_config = configs[i];
best_bitdiff = bitdiff;
}
if (bitdiff == 0) {
break; /* we found an exact match! */
}
}
return 0;
}
SDL_GLContext
SDL_EGL_CreateContext(_THIS, EGLSurface egl_surface)
{
/* max 14 values plus terminator. */
EGLint attribs[15];
int attr = 0;
EGLContext egl_context, share_context = EGL_NO_CONTEXT;
EGLint profile_mask = _this->gl_config.profile_mask;
EGLint major_version = _this->gl_config.major_version;
EGLint minor_version = _this->gl_config.minor_version;
SDL_bool profile_es = (profile_mask == SDL_GL_CONTEXT_PROFILE_ES);
if (!_this->egl_data) {
/* The EGL library wasn't loaded, SDL_GetError() should have info */
return NULL;
}
if (_this->gl_config.share_with_current_context) {
share_context = (EGLContext)SDL_GL_GetCurrentContext();
}
/* Set the context version and other attributes. */
if ((major_version < 3 || (minor_version == 0 && profile_es)) &&
_this->gl_config.flags == 0 &&
(profile_mask == 0 || profile_es)) {
/* Create a context without using EGL_KHR_create_context attribs.
* When creating a GLES context without EGL_KHR_create_context we can
* only specify the major version. When creating a desktop GL context
* we can't specify any version, so we only try in that case when the
* version is less than 3.0 (matches SDL's GLX/WGL behavior.)
*/
if (profile_es) {
attribs[attr++] = EGL_CONTEXT_CLIENT_VERSION;
attribs[attr++] = SDL_max(major_version, 1);
}
} else {
#ifdef EGL_KHR_create_context
/* The Major/minor version, context profiles, and context flags can
* only be specified when this extension is available.
*/
if (SDL_EGL_HasExtension(_this, "EGL_KHR_create_context")) {
attribs[attr++] = EGL_CONTEXT_MAJOR_VERSION_KHR;
attribs[attr++] = major_version;
attribs[attr++] = EGL_CONTEXT_MINOR_VERSION_KHR;
attribs[attr++] = minor_version;
/* SDL profile bits match EGL profile bits. */
if (profile_mask != 0 && profile_mask != SDL_GL_CONTEXT_PROFILE_ES) {
attribs[attr++] = EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR;
attribs[attr++] = profile_mask;
}
/* SDL flags match EGL flags. */
if (_this->gl_config.flags != 0) {
attribs[attr++] = EGL_CONTEXT_FLAGS_KHR;
attribs[attr++] = _this->gl_config.flags;
}
} else
#endif /* EGL_KHR_create_context */
{
SDL_SetError("Could not create EGL context (context attributes are not supported)");
return NULL;
}
}
attribs[attr++] = EGL_NONE;
/* Bind the API */
if (profile_es) {
_this->egl_data->eglBindAPI(EGL_OPENGL_ES_API);
} else {
_this->egl_data->eglBindAPI(EGL_OPENGL_API);
}
egl_context = _this->egl_data->eglCreateContext(_this->egl_data->egl_display,
_this->egl_data->egl_config,
share_context, attribs);
if (egl_context == EGL_NO_CONTEXT) {
SDL_SetError("Could not create EGL context");
return NULL;
}
_this->egl_data->egl_swapinterval = 0;
if (SDL_EGL_MakeCurrent(_this, egl_surface, egl_context) < 0) {
SDL_EGL_DeleteContext(_this, egl_context);
SDL_SetError("Could not make EGL context current");
return NULL;
}
return (SDL_GLContext) egl_context;
}
int
SDL_EGL_MakeCurrent(_THIS, EGLSurface egl_surface, SDL_GLContext context)
{
EGLContext egl_context = (EGLContext) context;
if (!_this->egl_data) {
return SDL_SetError("OpenGL not initialized");
}
/* The android emulator crashes badly if you try to eglMakeCurrent
* with a valid context and invalid surface, so we have to check for both here.
*/
if (!egl_context || !egl_surface) {
_this->egl_data->eglMakeCurrent(_this->egl_data->egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
} else {
if (!_this->egl_data->eglMakeCurrent(_this->egl_data->egl_display,
egl_surface, egl_surface, egl_context)) {
return SDL_SetError("Unable to make EGL context current");
}
}
return 0;
}
int
SDL_EGL_SetSwapInterval(_THIS, int interval)
{
EGLBoolean status;
if (!_this->egl_data) {
return SDL_SetError("EGL not initialized");
}
status = _this->egl_data->eglSwapInterval(_this->egl_data->egl_display, interval);
if (status == EGL_TRUE) {
_this->egl_data->egl_swapinterval = interval;
return 0;
}
return SDL_SetError("Unable to set the EGL swap interval");
}
int
SDL_EGL_GetSwapInterval(_THIS)
{
if (!_this->egl_data) {
return SDL_SetError("EGL not initialized");
}
return _this->egl_data->egl_swapinterval;
}
void
SDL_EGL_SwapBuffers(_THIS, EGLSurface egl_surface)
{
_this->egl_data->eglSwapBuffers(_this->egl_data->egl_display, egl_surface);
}
void
SDL_EGL_DeleteContext(_THIS, SDL_GLContext context)
{
EGLContext egl_context = (EGLContext) context;
/* Clean up GLES and EGL */
if (!_this->egl_data) {
return;
}
if (egl_context != NULL && egl_context != EGL_NO_CONTEXT) {
SDL_EGL_MakeCurrent(_this, NULL, NULL);
_this->egl_data->eglDestroyContext(_this->egl_data->egl_display, egl_context);
}
}
EGLSurface *
SDL_EGL_CreateSurface(_THIS, NativeWindowType nw)
{
if (SDL_EGL_ChooseConfig(_this) != 0) {
return EGL_NO_SURFACE;
}
#if __ANDROID__
{
/* Android docs recommend doing this!
* Ref: http://developer.android.com/reference/android/app/NativeActivity.html
*/
EGLint format;
_this->egl_data->eglGetConfigAttrib(_this->egl_data->egl_display,
_this->egl_data->egl_config,
EGL_NATIVE_VISUAL_ID, &format);
ANativeWindow_setBuffersGeometry(nw, 0, 0, format);
}
#endif
return _this->egl_data->eglCreateWindowSurface(
_this->egl_data->egl_display,
_this->egl_data->egl_config,
nw, NULL);
}
void
SDL_EGL_DestroySurface(_THIS, EGLSurface egl_surface)
{
if (!_this->egl_data) {
return;
}
if (egl_surface != EGL_NO_SURFACE) {
_this->egl_data->eglDestroySurface(_this->egl_data->egl_display, egl_surface);
}
}
#endif /* SDL_VIDEO_OPENGL_EGL */
/* vi: set ts=4 sw=4 expandtab: */
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