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Refactored SDL_EGL_CreateContext: It now supports context flags and O…
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…penGL ES 3+ contexts, and its behavior more closely matches the GLX and WGL context creation code.

Improved the code style consistency of SDL_egl.c.

Fixes bugzilla #2865.
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@slime73
slime73 committed May 12, 2015
1 parent 5919a85 commit f1a7c00
Showing 1 changed file with 87 additions and 72 deletions.
159 changes: 87 additions & 72 deletions src/video/SDL_egl.c 100644 → 100755
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Expand Up @@ -31,6 +31,13 @@
#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"
Expand Down Expand Up @@ -81,19 +88,18 @@ static int SDL_EGL_HasExtension(_THIS, const char *ext)
ext_len = SDL_strlen(ext);
exts = _this->egl_data->eglQueryString(_this->egl_data->egl_display, EGL_EXTENSIONS);

if(exts) {
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)) {
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 {
} else {
len++;
}
}
Expand Down Expand Up @@ -190,12 +196,11 @@ SDL_EGL_LoadLibrary(_THIS, const char *egl_path, NativeDisplayType native_displa
}

if (egl_dll_handle == NULL) {
if(_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES) {
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 {
} else {
path = DEFAULT_OGL_ES;
egl_dll_handle = SDL_LoadObject(path);
if (egl_dll_handle == NULL) {
Expand Down Expand Up @@ -334,17 +339,22 @@ SDL_EGL_ChooseConfig(_THIS)
attribs[i++] = EGL_SAMPLES;
attribs[i++] = _this->gl_config.multisamplesamples;
}

attribs[i++] = EGL_RENDERABLE_TYPE;
if(_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES) {
if (_this->gl_config.major_version == 2) {
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 {
} else {
attribs[i++] = EGL_OPENGL_BIT;
_this->egl_data->eglBindAPI(EGL_OPENGL_API);
}
Expand All @@ -362,7 +372,7 @@ SDL_EGL_ChooseConfig(_THIS)
/* 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++ ) {
for (i = 0; i < found_configs; i++ ) {
bitdiff = 0;
for (j = 0; j < SDL_arraysize(attribs) - 1; j += 2) {
if (attribs[j] == EGL_NONE) {
Expand All @@ -386,8 +396,10 @@ SDL_EGL_ChooseConfig(_THIS)

best_bitdiff = bitdiff;
}

if (bitdiff == 0) break; /* we found an exact match! */

if (bitdiff == 0) {
break; /* we found an exact match! */
}
}

return 0;
Expand All @@ -396,82 +408,86 @@ SDL_EGL_ChooseConfig(_THIS)
SDL_GLContext
SDL_EGL_CreateContext(_THIS, EGLSurface egl_surface)
{
EGLint context_attrib_list[] = {
EGL_CONTEXT_CLIENT_VERSION,
1,
EGL_NONE,
EGL_NONE,
EGL_NONE,
EGL_NONE,
EGL_NONE
};

/* 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;

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();
}

/* Bind the API */
if(_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES) {
_this->egl_data->eglBindAPI(EGL_OPENGL_ES_API);
if (_this->gl_config.major_version) {
context_attrib_list[1] = _this->gl_config.major_version;

/* Set the context version and other attributes. */
if (_this->gl_config.major_version < 3 && _this->gl_config.flags == 0 &&
(profile_mask == 0 || profile_mask == SDL_GL_CONTEXT_PROFILE_ES)) {
/* Create a context without using EGL_KHR_create_context attribs. */
if (profile_mask == SDL_GL_CONTEXT_PROFILE_ES) {
attribs[attr++] = EGL_CONTEXT_CLIENT_VERSION;
attribs[attr++] = SDL_max(_this->gl_config.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++] = _this->gl_config.major_version;
attribs[attr++] = EGL_CONTEXT_MINOR_VERSION_KHR;
attribs[attr++] = _this->gl_config.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;
}

egl_context = _this->egl_data->eglCreateContext(_this->egl_data->egl_display,
_this->egl_data->egl_config,
share_context, context_attrib_list);
}
else {
_this->egl_data->eglBindAPI(EGL_OPENGL_API);
#ifdef EGL_KHR_create_context
if(SDL_EGL_HasExtension(_this, "EGL_KHR_create_context")) {
context_attrib_list[0] = EGL_CONTEXT_MAJOR_VERSION_KHR;
context_attrib_list[1] = _this->gl_config.major_version;
context_attrib_list[2] = EGL_CONTEXT_MINOR_VERSION_KHR;
context_attrib_list[3] = _this->gl_config.minor_version;
context_attrib_list[4] = EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR;
switch(_this->gl_config.profile_mask) {
case SDL_GL_CONTEXT_PROFILE_COMPATIBILITY:
context_attrib_list[5] = EGL_CONTEXT_OPENGL_COMPATIBILITY_PROFILE_BIT_KHR;
break;

case SDL_GL_CONTEXT_PROFILE_CORE:
default:
context_attrib_list[5] = EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT_KHR;
break;
/* SDL flags match EGL flags. */
if (_this->gl_config.flags != 0) {
attribs[attr++] = EGL_CONTEXT_FLAGS_KHR;
attribs[attr++] = _this->gl_config.flags;
}
}
else {
context_attrib_list[0] = EGL_NONE;
}
#else /* EGL_KHR_create_context */
context_attrib_list[0] = EGL_NONE;
} else
#endif /* EGL_KHR_create_context */
egl_context = _this->egl_data->eglCreateContext(_this->egl_data->egl_display,
_this->egl_data->egl_config,
share_context, context_attrib_list);
{
SDL_SetError("Could not create EGL context (context attributes are not supported)");
return NULL;
}
}


attribs[attr++] = EGL_NONE;

/* Bind the API */
if (_this->gl_config.profile_mask == SDL_GL_CONTEXT_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;
}

Expand All @@ -489,8 +505,7 @@ SDL_EGL_MakeCurrent(_THIS, EGLSurface egl_surface, SDL_GLContext context)
*/
if (!egl_context || !egl_surface) {
_this->egl_data->eglMakeCurrent(_this->egl_data->egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
}
else {
} 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");
Expand Down

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