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Compute the closest matching EGL config

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Instead of picking the best one.
This commit is contained in:
Jonathan De Wachter 2016-10-11 15:30:18 +07:00
parent 72e8cad18e
commit 701136f8ce
1 changed files with 41 additions and 11 deletions
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52
src/SFML/Window/EglContext.cpp
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@ -237,25 +237,55 @@ EGLConfig EglContext::getBestConfig(EGLDisplay display, unsigned int bitsPerPixe
{ {
// Set our video settings constraint // Set our video settings constraint
const EGLint attributes[] = { const EGLint attributes[] = {
EGL_BUFFER_SIZE, bitsPerPixel,
EGL_DEPTH_SIZE, settings.depthBits,
EGL_STENCIL_SIZE, settings.stencilBits,
EGL_SAMPLE_BUFFERS, settings.antialiasingLevel ? 1 : 0,
EGL_SAMPLES, settings.antialiasingLevel,
EGL_SURFACE_TYPE, EGL_WINDOW_BIT | EGL_PBUFFER_BIT, EGL_SURFACE_TYPE, EGL_WINDOW_BIT | EGL_PBUFFER_BIT,
EGL_RENDERABLE_TYPE, EGL_OPENGL_ES_BIT, EGL_RENDERABLE_TYPE, EGL_OPENGL_ES_BIT,
EGL_NONE EGL_NONE
}; };
EGLint configCount; // Detect the number of available configuration
EGLConfig configs[1]; EGLint configsCount;
eglCheck(eglChooseConfig(display, attributes, NULL, 0, &configsCount));
// Ask EGL for the best config matching our video settings // Retrieve the list of available configuration
eglCheck(eglChooseConfig(display, attributes, configs, 1, &configCount)); EGLConfig* configs = new EGLConfig[configsCount];
eglCheck(eglChooseConfig(display, attributes, configs, configsCount, &configsCount));
// TODO: This should check EGL_CONFORMANT and pick the first conformant configuration. int bestScore = 0x7FFFFFFF;
EGLConfig bestConfig;
return configs[0]; for(GLint i = 0; i < configsCount ; i++)
{
EGLint red, green, blue, alpha, depth, stencil, multiSampling, samples, sRgb;
eglCheck(eglGetConfigAttrib(display, configs[i], EGL_RED_SIZE, &red));
eglCheck(eglGetConfigAttrib(display, configs[i], EGL_GREEN_SIZE, &green));
eglCheck(eglGetConfigAttrib(display, configs[i], EGL_BLUE_SIZE, &blue));
eglCheck(eglGetConfigAttrib(display, configs[i], EGL_ALPHA_SIZE, &alpha));
eglCheck(eglGetConfigAttrib(display, configs[i], EGL_DEPTH_SIZE, &depth));
eglCheck(eglGetConfigAttrib(display, configs[i], EGL_STENCIL_SIZE, &stencil));
eglCheck(eglGetConfigAttrib(display, configs[i], EGL_SAMPLE_BUFFERS, &multiSampling));
eglCheck(eglGetConfigAttrib(display, configs[i], EGL_SAMPLES, &samples));
sRgb = 0;
// TODO: Replace this with proper acceleration detection
bool accelerated = true;
// TODO: Detect sRGB capable
// Evaluate the visual
int color = red + green + blue + alpha;
int score = evaluateFormat(bitsPerPixel, settings, color, depth, stencil, multiSampling ? samples : 0, accelerated, false);
// If it's better than the current best, make it the new best
if (score < bestScore)
{
bestScore = score;
bestConfig = configs[i];
}
}
delete configs;
return bestConfig;
} }