PostProcessing/GLSL: Skip recompile on target size change

This is specific to reshade.

src/util/postprocessing_shader_glsl.cpp

@@ -124,8 +124,11 @@ void PostProcessing::GLSLShader::FillUniformBuffer(void* buffer, s32 viewport_x,
 bool PostProcessing::GLSLShader::CompilePipeline(GPUTexture::Format format, u32 width, u32 height, Error* error,
                                                  ProgressCallback* progress)
 {
-  if (m_pipeline)
-    m_pipeline.reset();
+  if (m_output_format == format)
+    return true;
+
+  m_pipeline.reset();
+  m_output_format = GPUTexture::Format::Unknown;
 
   PostProcessingGLSLShaderGen shadergen(g_gpu_device->GetRenderAPI(), g_gpu_device->GetFeatures().dual_source_blend,
                                         g_gpu_device->GetFeatures().framebuffer_fetch);
@@ -164,6 +167,7 @@ bool PostProcessing::GLSLShader::CompilePipeline(GPUTexture::Format format, u32
       return false;
   }
 
+  m_output_format = format;
   return true;
 }
 

src/util/postprocessing_shader_glsl.h

@@ -59,6 +59,7 @@ private:
 
   std::unique_ptr<GPUPipeline> m_pipeline;
   std::unique_ptr<GPUSampler> m_sampler;
+  GPUTexture::Format m_output_format = GPUTexture::Format::Unknown;
 };
 
 } // namespace PostProcessing