Merge pull request #8828 from stenzek/gles-readpixels

FramebufferManager: Copy to color format for depth readbacks on GLES

Source/Core/VideoBackends/D3D/main.cpp

@@ -92,6 +92,7 @@ void VideoBackend::FillBackendInfo()
   g_Config.backend_info.bSupportsGPUTextureDecoding = true;
   g_Config.backend_info.bSupportsCopyToVram = true;
   g_Config.backend_info.bSupportsLargePoints = false;
+  g_Config.backend_info.bSupportsDepthReadback = true;
   g_Config.backend_info.bSupportsPartialDepthCopies = false;
   g_Config.backend_info.bSupportsBitfield = false;
   g_Config.backend_info.bSupportsDynamicSamplerIndexing = false;

Source/Core/VideoBackends/D3D12/VideoBackend.cpp

@@ -77,6 +77,7 @@ void VideoBackend::FillBackendInfo()
   g_Config.backend_info.bSupportsFramebufferFetch = false;
   g_Config.backend_info.bSupportsBackgroundCompiling = true;
   g_Config.backend_info.bSupportsLargePoints = false;
+  g_Config.backend_info.bSupportsDepthReadback = true;
   g_Config.backend_info.bSupportsPartialDepthCopies = false;
   g_Config.backend_info.Adapters = D3DCommon::GetAdapterNames();
   g_Config.backend_info.AAModes = DXContext::GetAAModes(g_Config.iAdapter);

Source/Core/VideoBackends/Null/NullBackend.cpp

@@ -52,6 +52,7 @@ void VideoBackend::InitBackendInfo()
   g_Config.backend_info.bSupportsBackgroundCompiling = false;
   g_Config.backend_info.bSupportsLogicOp = false;
   g_Config.backend_info.bSupportsLargePoints = false;
+  g_Config.backend_info.bSupportsDepthReadback = false;
   g_Config.backend_info.bSupportsPartialDepthCopies = false;
   g_Config.backend_info.bSupportsShaderBinaries = false;
   g_Config.backend_info.bSupportsPipelineCacheData = false;

Source/Core/VideoBackends/OGL/Render.cpp

@@ -521,6 +521,10 @@ Renderer::Renderer(std::unique_ptr<GLContext> main_gl_context, float backbuffer_
     // GLES does not support logic op.
     g_Config.backend_info.bSupportsLogicOp = false;
 
+    // glReadPixels() can't be used with non-color formats. But, if we support
+    // ARB_get_texture_sub_image (unlikely, except maybe on NVIDIA), we can use that instead.
+    g_Config.backend_info.bSupportsDepthReadback = g_ogl_config.bSupportsTextureSubImage;
+
     if (GLExtensions::Supports("GL_EXT_shader_framebuffer_fetch"))
     {
       g_ogl_config.SupportedFramebufferFetch = EsFbFetchType::FbFetchExt;

Source/Core/VideoBackends/OGL/main.cpp

@@ -89,6 +89,7 @@ void VideoBackend::InitBackendInfo()
   g_Config.backend_info.bSupportsMultithreading = false;
   g_Config.backend_info.bSupportsCopyToVram = true;
   g_Config.backend_info.bSupportsLargePoints = true;
+  g_Config.backend_info.bSupportsDepthReadback = true;
   g_Config.backend_info.bSupportsPartialDepthCopies = true;
   g_Config.backend_info.bSupportsShaderBinaries = false;
   g_Config.backend_info.bSupportsPipelineCacheData = false;

Source/Core/VideoBackends/Software/SWmain.cpp

@@ -77,6 +77,7 @@ void VideoSoftware::InitBackendInfo()
   g_Config.backend_info.bSupportsBPTCTextures = false;
   g_Config.backend_info.bSupportsCopyToVram = false;
   g_Config.backend_info.bSupportsLargePoints = false;
+  g_Config.backend_info.bSupportsDepthReadback = false;
   g_Config.backend_info.bSupportsPartialDepthCopies = false;
   g_Config.backend_info.bSupportsFramebufferFetch = false;
   g_Config.backend_info.bSupportsBackgroundCompiling = false;

Source/Core/VideoCommon/FramebufferManager.cpp

@@ -513,7 +513,8 @@ bool FramebufferManager::CreateReadbackFramebuffer()
 
   // Since we can't partially copy from a depth buffer directly to the staging texture in D3D, we
   // use an intermediate buffer to avoid copying the whole texture.
-  if ((IsUsingTiledEFBCache() && !g_ActiveConfig.backend_info.bSupportsPartialDepthCopies) ||
+  if (!g_ActiveConfig.backend_info.bSupportsDepthReadback ||
+      (IsUsingTiledEFBCache() && !g_ActiveConfig.backend_info.bSupportsPartialDepthCopies) ||
       !AbstractTexture::IsCompatibleDepthAndColorFormats(m_efb_depth_texture->GetFormat(),
                                                          GetEFBDepthCopyFormat()) ||
       g_renderer->GetEFBScale() != 1)
@@ -577,7 +578,8 @@ void FramebufferManager::PopulateEFBCache(bool depth, u32 tile_index)
   // buffer directly to a staging texture (must be the whole resource).
   const bool force_intermediate_copy =
       depth &&
-      ((!g_ActiveConfig.backend_info.bSupportsPartialDepthCopies && IsUsingTiledEFBCache()) ||
+      (!g_ActiveConfig.backend_info.bSupportsDepthReadback ||
+       (!g_ActiveConfig.backend_info.bSupportsPartialDepthCopies && IsUsingTiledEFBCache()) ||
        !AbstractTexture::IsCompatibleDepthAndColorFormats(m_efb_depth_texture->GetFormat(),
                                                           GetEFBDepthCopyFormat()));
 

Source/Core/VideoCommon/VideoConfig.h

@@ -229,6 +229,7 @@ struct VideoConfig final
     bool bSupportsBackgroundCompiling;
     bool bSupportsLargePoints;
     bool bSupportsPartialDepthCopies;
+    bool bSupportsDepthReadback;
     bool bSupportsShaderBinaries;
     bool bSupportsPipelineCacheData;
   } backend_info;