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GPU: Alternate FBOs for chained postshaders.

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If you apply 4 in a row at the same resolution, we only need two actual
FBOs.  This will use less VRAM.
This commit is contained in:
Unknown W. Brackets 2020-05-16 10:02:12 -07:00
parent 9ef521d945
commit dcf4498f82
2 changed files with 35 additions and 4 deletions
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31
GPU/Common/PresentationCommon.cpp
View File

@ -286,13 +286,10 @@ bool PresentationCommon::BuildPostShader(const ShaderInfo *shaderInfo, const Sha
nextHeight = (int)rc.h;
}
// No depth/stencil for post processing
Draw::Framebuffer *fbo = draw_->CreateFramebuffer({ nextWidth, nextHeight, 1, 1, false, Draw::FBO_8888 });
if (!fbo) {
if (!AllocateFramebuffer(nextWidth, nextHeight)) {
pipeline->Release();
return false;
}
postShaderFramebuffers_.push_back(fbo);
}
postShaderPipelines_.push_back(pipeline);
@ -300,6 +297,31 @@ bool PresentationCommon::BuildPostShader(const ShaderInfo *shaderInfo, const Sha
return true;
}
bool PresentationCommon::AllocateFramebuffer(int w, int h) {
using namespace Draw;
// First, let's try to find a framebuffer of the right size that is NOT the most recent.
Framebuffer *last = postShaderFramebuffers_.empty() ? nullptr : postShaderFramebuffers_.back();
for (const auto &prev : postShaderFBOUsage_) {
if (prev.w == w && prev.h == h && prev.fbo != last) {
// Great, this one's perfect. Ref it for when we release.
prev.fbo->AddRef();
postShaderFramebuffers_.push_back(prev.fbo);
return true;
}
}
// No depth/stencil for post processing
Draw::Framebuffer *fbo = draw_->CreateFramebuffer({ w, h, 1, 1, false, Draw::FBO_8888 });
if (!fbo) {
return false;
}
postShaderFBOUsage_.push_back({ fbo, w, h });
postShaderFramebuffers_.push_back(fbo);
return true;
}
void PresentationCommon::ShowPostShaderError(const std::string &errorString) {
// let's show the first line of the error string as an OSM.
std::set<std::string> blacklistedLines;
@ -435,6 +457,7 @@ void PresentationCommon::DestroyPostShader() {
DoReleaseVector(postShaderPipelines_);
DoReleaseVector(postShaderFramebuffers_);
postShaderInfo_.clear();
postShaderFBOUsage_.clear();
}
Draw::ShaderModule *PresentationCommon::CompileShaderModule(Draw::ShaderStage stage, ShaderLanguage lang, const std::string &src, std::string *errorString) {

8
GPU/Common/PresentationCommon.h
View File

@ -122,6 +122,7 @@ protected:
Draw::ShaderModule *CompileShaderModule(Draw::ShaderStage stage, ShaderLanguage lang, const std::string &src, std::string *errorString);
Draw::Pipeline *CreatePipeline(std::vector<Draw::ShaderModule *> shaders, bool postShader, const Draw::UniformBufferDesc *uniformDesc);
bool BuildPostShader(const ShaderInfo *shaderInfo, const ShaderInfo *next);
bool AllocateFramebuffer(int w, int h);
void BindSource();
@ -155,4 +156,11 @@ protected:
bool usePostShader_ = false;
bool restorePostShader_ = false;
ShaderLanguage lang_;
struct PrevFBO {
Draw::Framebuffer *fbo;
int w;
int h;
};
std::vector<PrevFBO> postShaderFBOUsage_;
};