void FGLRenderBuffers::CreateExposureLevels(int width, int height)
{
ClearExposureLevels();
int i = 0;
do
{
width = MAX(width / 2, 1);
height = MAX(height / 2, 1);
FString textureName, fbName;
textureName.Format("Exposure.Texture%d", i);
fbName.Format("Exposure.Framebuffer%d", i);
i++;
FGLExposureTextureLevel level;
level.Width = width;
level.Height = height;
level.Texture = Create2DTexture(textureName, GL_R32F, level.Width, level.Height);
level.Framebuffer = CreateFrameBuffer(fbName, level.Texture);
ExposureLevels.Push(level);
} while (width > 1 || height > 1);
ExposureTexture = Create2DTexture("Exposure.CameraTexture", GL_R32F, 1, 1);
ExposureFB = CreateFrameBuffer("Exposure.CameraFB", ExposureTexture);
FirstExposureFrame = true;
}
FGLRenderBuffers::~FGLRenderBuffers()
{
ClearScene();
ClearPipeline();
ClearEyeBuffers();
ClearBloom();
ClearExposureLevels();
}
bool FGLRenderBuffers::Setup(int width, int height, int sceneWidth, int sceneHeight)
{
if (gl_renderbuffers != BuffersActive)
{
if (BuffersActive)
glBindFramebuffer(GL_FRAMEBUFFER, mOutputFB);
BuffersActive = gl_renderbuffers;
GLRenderer->mShaderManager->ResetFixedColormap();
}
if (!IsEnabled())
return false;
if (width <= 0 || height <= 0)
I_FatalError("Requested invalid render buffer sizes: screen = %dx%d", width, height);
int samples = clamp((int)gl_multisample, 0, mMaxSamples);
bool needsSceneTextures = (gl_ssao != 0);
GLint activeTex;
GLint textureBinding;
glGetIntegerv(GL_ACTIVE_TEXTURE, &activeTex);
glActiveTexture(GL_TEXTURE0);
glGetIntegerv(GL_TEXTURE_BINDING_2D, &textureBinding);
if (width != mWidth || height != mHeight)
CreatePipeline(width, height);
if (width != mWidth || height != mHeight || mSamples != samples || mSceneUsesTextures != needsSceneTextures)
CreateScene(width, height, samples, needsSceneTextures);
mWidth = width;
mHeight = height;
mSamples = samples;
mSceneUsesTextures = needsSceneTextures;
// Bloom bluring buffers need to match the scene to avoid bloom bleeding artifacts
if (mSceneWidth != sceneWidth || mSceneHeight != sceneHeight)
{
CreateBloom(sceneWidth, sceneHeight);
CreateExposureLevels(sceneWidth, sceneHeight);
CreateAmbientOcclusion(sceneWidth, sceneHeight);
mSceneWidth = sceneWidth;
mSceneHeight = sceneHeight;
}
glBindTexture(GL_TEXTURE_2D, textureBinding);
glActiveTexture(activeTex);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
if (FailedCreate)
{
ClearScene();
ClearPipeline();
ClearEyeBuffers();
ClearBloom();
ClearExposureLevels();
mWidth = 0;
mHeight = 0;
mSamples = 0;
mSceneWidth = 0;
mSceneHeight = 0;
}
return !FailedCreate;
}
