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Find the best EGL config available between those returned by eglChooseConfig

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This existed in the old Android Java code, it got lost in the migration to the
commong EGL code.
This commit is contained in:
Gabriel Jacobo 2013-11-19 11:04:05 -03:00
parent 47139fb3eb
commit 131a072503
1 changed files with 36 additions and 2 deletions
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38
src/video/SDL_egl.c
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@ -218,7 +218,9 @@ SDL_EGL_ChooseConfig(_THIS)
/* 64 seems nice. */ /* 64 seems nice. */
EGLint attribs[64]; EGLint attribs[64];
EGLint found_configs = 0; EGLint found_configs = 0;
int i; /* 128 seems even nicer here */
EGLConfig configs[128];
int i, j, best_bitdiff = -1, bitdiff, value;
if (!_this->egl_data) { if (!_this->egl_data) {
/* The EGL library wasn't loaded, SDL_GetError() should have info */ /* The EGL library wasn't loaded, SDL_GetError() should have info */
@ -273,12 +275,44 @@ SDL_EGL_ChooseConfig(_THIS)
if (_this->egl_data->eglChooseConfig(_this->egl_data->egl_display, if (_this->egl_data->eglChooseConfig(_this->egl_data->egl_display,
attribs, attribs,
&_this->egl_data->egl_config, 1, configs, SDL_arraysize(configs),
&found_configs) == EGL_FALSE || &found_configs) == EGL_FALSE ||
found_configs == 0) { found_configs == 0) {
return SDL_SetError("Couldn't find matching EGL config"); 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 += 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; return 0;
} }