GPU/HW: Expose depth buffer to internal postprocessing

src/core/gpu.cpp

@@ -1770,7 +1770,6 @@ bool GPU::CompileDisplayPipelines(bool display, bool deinterlace, bool chroma_sm
     GL_OBJECT_NAME(vso, "Display Vertex Shader");
     GL_OBJECT_NAME_FMT(fso, "Display Fragment Shader [{}]",
                        Settings::GetDisplayScalingName(g_settings.display_scaling));
-
     plconfig.vertex_shader = vso.get();
     plconfig.fragment_shader = fso.get();
     if (!(m_display_pipeline = g_gpu_device->CreatePipeline(plconfig)))
@@ -1913,10 +1912,12 @@ void GPU::ClearDisplayTexture()
   m_display_texture_view_height = 0;
 }
 
-void GPU::SetDisplayTexture(GPUTexture* texture, s32 view_x, s32 view_y, s32 view_width, s32 view_height)
+void GPU::SetDisplayTexture(GPUTexture* texture, GPUTexture* depth_buffer, s32 view_x, s32 view_y, s32 view_width,
+                            s32 view_height)
 {
   DebugAssert(texture);
   m_display_texture = texture;
+  m_display_depth_buffer = depth_buffer;
   m_display_texture_view_x = view_x;
   m_display_texture_view_y = view_y;
   m_display_texture_view_width = view_width;
@@ -1957,10 +1958,10 @@ bool GPU::RenderDisplay(GPUTexture* target, const Common::Rectangle<s32>& draw_r
 
     // Now we can apply the post chain.
     GPUTexture* post_output_texture = PostProcessing::InternalChain.GetOutputTexture();
-    if (PostProcessing::InternalChain.Apply(display_texture, post_output_texture, 0, 0, display_texture_view_width,
-                                            display_texture_view_height, display_texture_view_width,
-                                            display_texture_view_height, m_crtc_state.display_width,
-                                            m_crtc_state.display_height))
+    if (PostProcessing::InternalChain.Apply(display_texture, m_display_depth_buffer, post_output_texture, 0, 0,
+                                            display_texture_view_width, display_texture_view_height,
+                                            display_texture_view_width, display_texture_view_height,
+                                            m_crtc_state.display_width, m_crtc_state.display_height))
     {
       display_texture_view_x = 0;
       display_texture_view_y = 0;
@@ -2075,7 +2076,7 @@ bool GPU::RenderDisplay(GPUTexture* target, const Common::Rectangle<s32>& draw_r
     const s32 orig_width = static_cast<s32>(std::ceil(static_cast<float>(m_crtc_state.display_width) * upscale_x));
     const s32 orig_height = static_cast<s32>(std::ceil(static_cast<float>(m_crtc_state.display_height) * upscale_y));
 
-    return PostProcessing::DisplayChain.Apply(PostProcessing::DisplayChain.GetInputTexture(), target,
+    return PostProcessing::DisplayChain.Apply(PostProcessing::DisplayChain.GetInputTexture(), nullptr, target,
                                               real_draw_rect.left, real_draw_rect.top, real_draw_rect.GetWidth(),
                                               real_draw_rect.GetHeight(), orig_width, orig_height,
                                               m_crtc_state.display_width, m_crtc_state.display_height);
@@ -2113,7 +2114,7 @@ bool GPU::Deinterlace(u32 field, u32 line_skip)
       if (!DeinterlaceExtractField(0, src, x, y, width, height, line_skip)) [[unlikely]]
         return false;
 
-      SetDisplayTexture(m_deinterlace_buffers[0].get(), 0, 0, width, height);
+      SetDisplayTexture(m_deinterlace_buffers[0].get(), m_display_depth_buffer, 0, 0, width, height);
       return true;
     }
 
@@ -2139,7 +2140,7 @@ bool GPU::Deinterlace(u32 field, u32 line_skip)
       g_gpu_device->Draw(3, 0);
 
       m_deinterlace_texture->MakeReadyForSampling();
-      SetDisplayTexture(m_deinterlace_texture.get(), 0, 0, width, full_height);
+      SetDisplayTexture(m_deinterlace_texture.get(), m_display_depth_buffer, 0, 0, width, full_height);
       return true;
     }
 
@@ -2171,7 +2172,7 @@ bool GPU::Deinterlace(u32 field, u32 line_skip)
       g_gpu_device->Draw(3, 0);
 
       m_deinterlace_texture->MakeReadyForSampling();
-      SetDisplayTexture(m_deinterlace_texture.get(), 0, 0, width, height);
+      SetDisplayTexture(m_deinterlace_texture.get(), m_display_depth_buffer, 0, 0, width, height);
       return true;
     }
 
@@ -2206,7 +2207,7 @@ bool GPU::Deinterlace(u32 field, u32 line_skip)
       g_gpu_device->Draw(3, 0);
 
       m_deinterlace_texture->MakeReadyForSampling();
-      SetDisplayTexture(m_deinterlace_texture.get(), 0, 0, width, full_height);
+      SetDisplayTexture(m_deinterlace_texture.get(), m_display_depth_buffer, 0, 0, width, full_height);
       return true;
     }
 
@@ -2309,7 +2310,7 @@ bool GPU::ApplyChromaSmoothing()
   g_gpu_device->Draw(3, 0);
 
   m_chroma_smoothing_texture->MakeReadyForSampling();
-  SetDisplayTexture(m_chroma_smoothing_texture.get(), 0, 0, width, height);
+  SetDisplayTexture(m_chroma_smoothing_texture.get(), m_display_depth_buffer, 0, 0, width, height);
   return true;
 }
 

src/core/gpu.h

@@ -603,7 +603,8 @@ protected:
   u32 m_fifo_size = 128;
 
   void ClearDisplayTexture();
-  void SetDisplayTexture(GPUTexture* texture, s32 view_x, s32 view_y, s32 view_width, s32 view_height);
+  void SetDisplayTexture(GPUTexture* texture, GPUTexture* depth_texture, s32 view_x, s32 view_y, s32 view_width,
+                         s32 view_height);
 
   bool RenderDisplay(GPUTexture* target, const Common::Rectangle<s32>& draw_rect, bool postfx);
 
@@ -624,6 +625,7 @@ protected:
 
   std::unique_ptr<GPUPipeline> m_display_pipeline;
   GPUTexture* m_display_texture = nullptr;
+  GPUTexture* m_display_depth_buffer = nullptr;
   s32 m_display_texture_view_x = 0;
   s32 m_display_texture_view_y = 0;
   s32 m_display_texture_view_width = 0;

src/core/gpu_hw.cpp

@@ -34,6 +34,7 @@ Log_SetChannel(GPU_HW);
 static constexpr GPUTexture::Format VRAM_RT_FORMAT = GPUTexture::Format::RGBA8;
 static constexpr GPUTexture::Format VRAM_DS_FORMAT = GPUTexture::Format::D16;
 static constexpr GPUTexture::Format VRAM_DS_DEPTH_FORMAT = GPUTexture::Format::D32F;
+static constexpr GPUTexture::Format VRAM_DS_EXTRACT_FORMAT = GPUTexture::Format::R32F;
 
 #ifdef _DEBUG
 static u32 s_draw_number = 0;
@@ -414,6 +415,7 @@ void GPU_HW::UpdateSettings(const Settings& old_settings)
   {
     m_pgxp_depth_buffer = g_settings.UsingPGXPDepthBuffer();
     m_batch.use_depth_buffer = false;
+    m_depth_was_copied = false;
 
     // might be null when resizing
     if (m_vram_depth_texture)
@@ -722,8 +724,10 @@ bool GPU_HW::CreateBuffers()
   if (!(m_vram_texture = g_gpu_device->FetchTexture(texture_width, texture_height, 1, 1, samples,
                                                     GPUTexture::Type::RenderTarget, VRAM_RT_FORMAT)) ||
       (needs_depth_buffer &&
-       !(m_vram_depth_texture = g_gpu_device->FetchTexture(texture_width, texture_height, 1, 1, samples,
-                                                           GPUTexture::Type::DepthStencil, GetDepthBufferFormat()))) ||
+       (!(m_vram_depth_texture = g_gpu_device->FetchTexture(texture_width, texture_height, 1, 1, samples,
+                                                            GPUTexture::Type::DepthStencil, GetDepthBufferFormat())) ||
+        !(m_vram_depth_copy_texture = g_gpu_device->FetchTexture(
+            texture_width, texture_height, 1, 1, samples, GPUTexture::Type::RenderTarget, VRAM_DS_EXTRACT_FORMAT)))) ||
       !(m_vram_read_texture =
           g_gpu_device->FetchTexture(texture_width, texture_height, 1, 1, 1, read_texture_type, VRAM_RT_FORMAT)) ||
       !(m_vram_readback_texture = g_gpu_device->FetchTexture(VRAM_WIDTH / 2, VRAM_HEIGHT, 1, 1, 1,
@@ -802,8 +806,10 @@ void GPU_HW::DestroyBuffers()
   m_vram_upload_buffer.reset();
   m_vram_readback_download_texture.reset();
   g_gpu_device->RecycleTexture(std::move(m_downsample_texture));
+  g_gpu_device->RecycleTexture(std::move(m_vram_extract_depth_texture));
   g_gpu_device->RecycleTexture(std::move(m_vram_extract_texture));
   g_gpu_device->RecycleTexture(std::move(m_vram_read_texture));
+  g_gpu_device->RecycleTexture(std::move(m_vram_depth_copy_texture));
   g_gpu_device->RecycleTexture(std::move(m_vram_depth_texture));
   g_gpu_device->RecycleTexture(std::move(m_vram_texture));
   g_gpu_device->RecycleTexture(std::move(m_vram_readback_texture));
@@ -1289,23 +1295,50 @@ bool GPU_HW::CompilePipelines()
 
   // Display
   {
-    for (u8 depth_24 = 0; depth_24 < 2; depth_24++)
+    for (u8 shader = 0; shader < 3; shader++)
     {
+      // 24-bit doesn't give you a depth buffer.
+      const bool color_24bit = (shader == 1);
+      const bool depth_extract = (shader == 2);
+      if (depth_extract && !m_pgxp_depth_buffer)
+        continue;
+
       std::unique_ptr<GPUShader> fs =
         g_gpu_device->CreateShader(GPUShaderStage::Fragment, shadergen.GetLanguage(),
-                                   shadergen.GenerateVRAMExtractFragmentShader(ConvertToBoolUnchecked(depth_24)));
+                                   shadergen.GenerateVRAMExtractFragmentShader(color_24bit, depth_extract));
       if (!fs)
         return false;
 
       plconfig.fragment_shader = fs.get();
 
-      if (!(m_vram_extract_pipeline[depth_24] = g_gpu_device->CreatePipeline(plconfig)))
+      plconfig.layout = depth_extract ? GPUPipeline::Layout::MultiTextureAndPushConstants :
+                                        GPUPipeline::Layout::SingleTextureAndPushConstants;
+      plconfig.color_formats[1] = depth_extract ? VRAM_DS_EXTRACT_FORMAT : GPUTexture::Format::Unknown;
+
+      if (!(m_vram_extract_pipeline[shader] = g_gpu_device->CreatePipeline(plconfig)))
         return false;
 
       progress.Increment();
     }
   }
 
+  plconfig.layout = GPUPipeline::Layout::SingleTextureAndPushConstants;
+
+  if (m_pgxp_depth_buffer)
+  {
+    std::unique_ptr<GPUShader> fs = g_gpu_device->CreateShader(GPUShaderStage::Fragment, shadergen.GetLanguage(),
+                                                               shadergen.GenerateCopyFragmentShader());
+    if (!fs)
+      return false;
+
+    plconfig.fragment_shader = fs.get();
+    plconfig.SetTargetFormats(VRAM_DS_EXTRACT_FORMAT);
+    if (!(m_copy_depth_pipeline = g_gpu_device->CreatePipeline(plconfig)))
+      return false;
+  }
+
+  plconfig.SetTargetFormats(VRAM_RT_FORMAT);
+
   if (m_downsample_mode == GPUDownsampleMode::Adaptive)
   {
     std::unique_ptr<GPUShader> vs = g_gpu_device->CreateShader(GPUShaderStage::Vertex, shadergen.GetLanguage(),
@@ -1419,6 +1452,8 @@ void GPU_HW::DestroyPipelines()
   destroy(m_downsample_blur_pass_pipeline);
   destroy(m_downsample_composite_pass_pipeline);
   m_downsample_composite_sampler.reset();
+
+  m_copy_depth_pipeline.reset();
 }
 
 GPU_HW::BatchRenderMode GPU_HW::BatchConfig::GetRenderMode() const
@@ -1515,10 +1550,40 @@ void GPU_HW::UpdateDepthBufferFromMaskBit()
   SetScissor();
 }
 
+void GPU_HW::CopyAndClearDepthBuffer()
+{
+  if (!m_depth_was_copied)
+  {
+    // Take a copy of the current depth buffer so it can be used when the previous frame/buffer gets scanned out.
+    // Don't bother when we're not postprocessing, it'd just be a wasted copy.
+    if (PostProcessing::InternalChain.NeedsDepthBuffer())
+    {
+      // TODO: Shrink this to only the active area.
+      GL_SCOPE("Copy Depth Buffer");
+
+      m_vram_texture->MakeReadyForSampling();
+      g_gpu_device->InvalidateRenderTarget(m_vram_depth_copy_texture.get());
+      g_gpu_device->SetRenderTarget(m_vram_depth_copy_texture.get());
+      g_gpu_device->SetViewportAndScissor(0, 0, m_vram_depth_texture->GetWidth(), m_vram_depth_texture->GetHeight());
+      g_gpu_device->SetTextureSampler(0, m_vram_depth_texture.get(), g_gpu_device->GetNearestSampler());
+      g_gpu_device->SetPipeline(m_copy_depth_pipeline.get());
+
+      const float uniforms[4] = {0.0f, 0.0f, 1.0f, 1.0f};
+      g_gpu_device->PushUniformBuffer(uniforms, sizeof(uniforms));
+      g_gpu_device->Draw(3, 0);
+      RestoreDeviceContext();
+    }
+
+    m_depth_was_copied = true;
+  }
+
+  ClearDepthBuffer();
+}
+
 void GPU_HW::ClearDepthBuffer()
 {
+  GL_SCOPE("GPU_HW::ClearDepthBuffer()");
   DebugAssert(m_pgxp_depth_buffer);
-
   g_gpu_device->ClearDepth(m_vram_depth_texture.get(), 1.0f);
   m_last_depth_z = 1.0f;
 }
@@ -1911,13 +1976,9 @@ void GPU_HW::CheckForDepthClear(const BatchVertex* vertices, u32 num_vertices)
 
   if ((average_z - m_last_depth_z) >= g_settings.gpu_pgxp_depth_clear_threshold)
   {
-    if (m_batch_index_count > 0)
-    {
-      FlushRender();
-      EnsureVertexBufferSpaceForCurrentCommand();
-    }
-
-    ClearDepthBuffer();
+    FlushRender();
+    CopyAndClearDepthBuffer();
+    EnsureVertexBufferSpaceForCurrentCommand();
   }
 
   m_last_depth_z = average_z;
@@ -3204,7 +3265,11 @@ void GPU_HW::DispatchRenderCommand()
       SetScissor();
 
       if (m_pgxp_depth_buffer && m_last_depth_z < 1.0f)
-        ClearDepthBuffer();
+      {
+        FlushRender();
+        CopyAndClearDepthBuffer();
+        EnsureVertexBufferSpaceForCurrentCommand();
+      }
 
       if (m_sw_renderer)
       {
@@ -3292,12 +3357,12 @@ void GPU_HW::UpdateDisplay()
     if (IsUsingMultisampling())
     {
       UpdateVRAMReadTexture(true, true);
-      SetDisplayTexture(m_vram_read_texture.get(), 0, 0, m_vram_read_texture->GetWidth(),
+      SetDisplayTexture(m_vram_read_texture.get(), nullptr, 0, 0, m_vram_read_texture->GetWidth(),
                         m_vram_read_texture->GetHeight());
     }
     else
     {
-      SetDisplayTexture(m_vram_texture.get(), 0, 0, m_vram_texture->GetWidth(), m_vram_texture->GetHeight());
+      SetDisplayTexture(m_vram_texture.get(), nullptr, 0, 0, m_vram_texture->GetWidth(), m_vram_texture->GetHeight());
     }
 
     return;
@@ -3315,6 +3380,12 @@ void GPU_HW::UpdateDisplay()
   const u32 line_skip = BoolToUInt32(interlaced && m_GPUSTAT.vertical_resolution);
   bool drew_anything = false;
 
+  // Don't bother grabbing depth if postfx doesn't need it.
+  GPUTexture* depth_source = (!m_GPUSTAT.display_area_color_depth_24 && m_pgxp_depth_buffer &&
+                              PostProcessing::InternalChain.NeedsDepthBuffer()) ?
+                               (m_depth_was_copied ? m_vram_depth_copy_texture.get() : m_vram_depth_texture.get()) :
+                               nullptr;
+
   if (IsDisplayDisabled())
   {
     ClearDisplayTexture();
@@ -3325,8 +3396,8 @@ void GPU_HW::UpdateDisplay()
            (scaled_vram_offset_y + scaled_display_height) <= m_vram_texture->GetHeight() &&
            !PostProcessing::InternalChain.IsActive())
   {
-    SetDisplayTexture(m_vram_texture.get(), scaled_vram_offset_x, scaled_vram_offset_y, scaled_display_width,
-                      read_height);
+    SetDisplayTexture(m_vram_texture.get(), depth_source, scaled_vram_offset_x, scaled_vram_offset_y,
+                      scaled_display_width, read_height);
 
     // Fast path if no copies are needed.
     if (interlaced)
@@ -3353,14 +3424,39 @@ void GPU_HW::UpdateDisplay()
       }
     }
 
+    m_vram_texture->MakeReadyForSampling();
     g_gpu_device->InvalidateRenderTarget(m_vram_extract_texture.get());
-    g_gpu_device->SetRenderTarget(m_vram_extract_texture.get());
-    g_gpu_device->SetPipeline(m_vram_extract_pipeline[BoolToUInt8(m_GPUSTAT.display_area_color_depth_24)].get());
-    g_gpu_device->SetTextureSampler(0, m_vram_texture.get(), g_gpu_device->GetNearestSampler());
+
+    if (depth_source &&
+        ((m_vram_extract_depth_texture && m_vram_extract_depth_texture->GetWidth() == scaled_display_width &&
+          m_vram_extract_depth_texture->GetHeight() == scaled_display_height) ||
+         !g_gpu_device->ResizeTexture(&m_vram_extract_depth_texture, scaled_display_width, scaled_display_height,
+                                      GPUTexture::Type::RenderTarget, VRAM_DS_EXTRACT_FORMAT)))
+    {
+      depth_source->MakeReadyForSampling();
+      g_gpu_device->InvalidateRenderTarget(m_vram_extract_depth_texture.get());
+
+      GPUTexture* targets[] = {m_vram_extract_texture.get(), m_vram_extract_depth_texture.get()};
+      g_gpu_device->SetRenderTargets(targets, static_cast<u32>(std::size(targets)), nullptr);
+      g_gpu_device->SetPipeline(m_vram_extract_pipeline[2].get());
+
+      g_gpu_device->SetTextureSampler(0, m_vram_texture.get(), g_gpu_device->GetNearestSampler());
+      g_gpu_device->SetTextureSampler(1, depth_source, g_gpu_device->GetNearestSampler());
+    }
+    else
+    {
+      g_gpu_device->SetRenderTarget(m_vram_extract_texture.get());
+      g_gpu_device->SetPipeline(m_vram_extract_pipeline[BoolToUInt8(m_GPUSTAT.display_area_color_depth_24)].get());
+      g_gpu_device->SetTextureSampler(0, m_vram_texture.get(), g_gpu_device->GetNearestSampler());
+    }
 
     const u32 reinterpret_start_x = m_crtc_state.regs.X * resolution_scale;
     const u32 skip_x = (m_crtc_state.display_vram_left - m_crtc_state.regs.X) * resolution_scale;
-    GL_INS_FMT("Convert 16bpp to 24bpp, skip_x = {}, line_skip = {}", skip_x, line_skip);
+    GL_INS_FMT("VRAM extract, depth = {}, 24bpp = {}, skip_x = {}, line_skip = {}", depth_source ? "yes" : "no",
+               m_GPUSTAT.display_area_color_depth_24.GetValue(), skip_x, line_skip);
+    GL_INS_FMT("Source: {},{} => {},{} ({}x{})", reinterpret_start_x, scaled_vram_offset_y,
+               reinterpret_start_x + scaled_display_width, scaled_vram_offset_y + read_height, scaled_display_width,
+               read_height);
 
     const u32 uniforms[4] = {reinterpret_start_x, scaled_vram_offset_y, skip_x, line_skip};
     g_gpu_device->PushUniformBuffer(uniforms, sizeof(uniforms));
@@ -3369,9 +3465,17 @@ void GPU_HW::UpdateDisplay()
     g_gpu_device->Draw(3, 0);
 
     m_vram_extract_texture->MakeReadyForSampling();
+    if (depth_source)
+    {
+      // Thanks DX11...
+      m_vram_extract_depth_texture->MakeReadyForSampling();
+      g_gpu_device->SetTextureSampler(1, nullptr, nullptr);
+    }
+
     drew_anything = true;
 
-    SetDisplayTexture(m_vram_extract_texture.get(), 0, 0, scaled_display_width, read_height);
+    SetDisplayTexture(m_vram_extract_texture.get(), depth_source ? m_vram_extract_depth_texture.get() : nullptr, 0, 0,
+                      scaled_display_width, read_height);
     if (g_settings.gpu_24bit_chroma_smoothing)
     {
       if (ApplyChromaSmoothing())
@@ -3425,6 +3529,7 @@ void GPU_HW::UpdateDownsamplingLevels()
 void GPU_HW::OnBufferSwapped()
 {
   GL_INS("OnBufferSwapped()");
+  m_depth_was_copied = false;
 }
 
 void GPU_HW::DownsampleFramebuffer()
@@ -3556,7 +3661,7 @@ void GPU_HW::DownsampleFramebufferAdaptive(GPUTexture* source, u32 left, u32 top
 
   RestoreDeviceContext();
 
-  SetDisplayTexture(m_downsample_texture.get(), 0, 0, width, height);
+  SetDisplayTexture(m_downsample_texture.get(), m_display_depth_buffer, 0, 0, width, height);
 }
 
 void GPU_HW::DownsampleFramebufferBoxFilter(GPUTexture* source, u32 left, u32 top, u32 width, u32 height)
@@ -3594,7 +3699,7 @@ void GPU_HW::DownsampleFramebufferBoxFilter(GPUTexture* source, u32 left, u32 to
 
   RestoreDeviceContext();
 
-  SetDisplayTexture(m_downsample_texture.get(), 0, 0, ds_width, ds_height);
+  SetDisplayTexture(m_downsample_texture.get(), m_display_depth_buffer, 0, 0, ds_width, ds_height);
 }
 
 void GPU_HW::DrawRendererStats()

src/core/gpu_hw.h

@@ -156,6 +156,7 @@ private:
   void SetClampedDrawingArea();
   void UpdateVRAMReadTexture(bool drawn, bool written);
   void UpdateDepthBufferFromMaskBit();
+  void CopyAndClearDepthBuffer();
   void ClearDepthBuffer();
   void SetScissor();
   void SetVRAMRenderTarget();
@@ -229,6 +230,7 @@ private:
 
   std::unique_ptr<GPUTexture> m_vram_texture;
   std::unique_ptr<GPUTexture> m_vram_depth_texture;
+  std::unique_ptr<GPUTexture> m_vram_depth_copy_texture;
   std::unique_ptr<GPUTexture> m_vram_read_texture;
   std::unique_ptr<GPUTexture> m_vram_readback_texture;
   std::unique_ptr<GPUDownloadTexture> m_vram_readback_download_texture;
@@ -269,6 +271,7 @@ private:
   bool m_allow_shader_blend : 1 = false;
 
   u8 m_texpage_dirty = 0;
+  bool m_depth_was_copied = false;
 
   BatchConfig m_batch;
 
@@ -295,8 +298,10 @@ private:
   std::unique_ptr<GPUPipeline> m_vram_update_depth_pipeline;
   std::unique_ptr<GPUPipeline> m_vram_write_replacement_pipeline;
 
-  std::array<std::unique_ptr<GPUPipeline>, 2> m_vram_extract_pipeline; // [24bit]
+  std::array<std::unique_ptr<GPUPipeline>, 3> m_vram_extract_pipeline; // [24bit, 2=depth]
   std::unique_ptr<GPUTexture> m_vram_extract_texture;
+  std::unique_ptr<GPUTexture> m_vram_extract_depth_texture;
+  std::unique_ptr<GPUPipeline> m_copy_depth_pipeline;
 
   std::unique_ptr<GPUTexture> m_downsample_texture;
   std::unique_ptr<GPUPipeline> m_downsample_first_pass_pipeline;

src/core/gpu_hw_shadergen.cpp

@@ -1031,16 +1031,19 @@ float3 ApplyDebanding(float2 frag_coord)
   return ss.str();
 }
 
-std::string GPU_HW_ShaderGen::GenerateVRAMExtractFragmentShader(bool depth_24bit)
+std::string GPU_HW_ShaderGen::GenerateVRAMExtractFragmentShader(bool color_24bit, bool depth_buffer)
 {
   std::stringstream ss;
   WriteHeader(ss);
-  DefineMacro(ss, "DEPTH_24BIT", depth_24bit);
+  DefineMacro(ss, "COLOR_24BIT", color_24bit);
+  DefineMacro(ss, "DEPTH_BUFFER", depth_buffer);
   DefineMacro(ss, "MULTISAMPLED", UsingMSAA());
 
   WriteCommonFunctions(ss);
   DeclareUniformBuffer(ss, {"uint2 u_vram_offset", "uint u_skip_x", "uint u_line_skip"}, true);
   DeclareTexture(ss, "samp0", 0, UsingMSAA());
+  if (depth_buffer)
+    DeclareTexture(ss, "samp1", 1, UsingMSAA());
 
   ss << R"(
 float4 LoadVRAM(int2 coords)
@@ -1056,6 +1059,22 @@ float4 LoadVRAM(int2 coords)
 #endif
 }
 
+#if DEPTH_BUFFER
+float LoadDepth(int2 coords)
+{
+  // Need to duplicate because different types in different languages...
+#if MULTISAMPLING
+  float value = LOAD_TEXTURE_MS(samp1, coords, 0u).r;
+  FOR_UNROLL (uint sample_index = 1u; sample_index < MULTISAMPLES; sample_index++)
+    value += LOAD_TEXTURE_MS(samp1, coords, sample_index).r;
+  value /= float(MULTISAMPLES);
+  return value;
+#else
+  return LOAD_TEXTURE(samp1, coords, 0).r;
+#endif
+}
+#endif
+
 float3 SampleVRAM24(uint2 icoords)
 {
   // load adjacent 16-bit texels
@@ -1075,15 +1094,20 @@ float3 SampleVRAM24(uint2 icoords)
 }
 )";
 
-  DeclareFragmentEntryPoint(ss, 0, 1, {}, true, 1);
+  DeclareFragmentEntryPoint(ss, 0, 1, {}, true, depth_buffer ? 2 : 1);
   ss << R"(
 {
   uint2 icoords = uint2(uint(v_pos.x) + u_skip_x, uint(v_pos.y) << u_line_skip);
+  int2 wrapped_coords = int2((icoords + u_vram_offset) % VRAM_SIZE);
 
-  #if DEPTH_24BIT
+  #if COLOR_24BIT
     o_col0 = float4(SampleVRAM24(icoords), 1.0);
   #else
-    o_col0 = float4(LoadVRAM(int2((icoords + u_vram_offset) % VRAM_SIZE)).rgb, 1.0);
+    o_col0 = float4(LoadVRAM(wrapped_coords).rgb, 1.0);
+  #endif
+
+  #if DEPTH_BUFFER
+    o_col1 = float4(LoadDepth(wrapped_coords), 0.0, 0.0, 0.0);
   #endif
 }
 )";

src/core/gpu_hw_shadergen.h

@@ -25,7 +25,7 @@ public:
   std::string GenerateVRAMCopyFragmentShader();
   std::string GenerateVRAMFillFragmentShader(bool wrapped, bool interlaced);
   std::string GenerateVRAMUpdateDepthFragmentShader();
-  std::string GenerateVRAMExtractFragmentShader(bool depth_24bit);
+  std::string GenerateVRAMExtractFragmentShader(bool color_24bit, bool depth_buffer);
 
   std::string GenerateAdaptiveDownsampleVertexShader();
   std::string GenerateAdaptiveDownsampleMipFragmentShader(bool first_pass);

src/core/gpu_sw.cpp

@@ -486,7 +486,7 @@ void GPU_SW::UpdateDisplay()
       const u32 line_skip = m_GPUSTAT.vertical_resolution;
       if (CopyOut(vram_offset_x, vram_offset_y, skip_x, read_width, read_height, line_skip, is_24bit))
       {
-        SetDisplayTexture(m_upload_texture.get(), 0, 0, read_width, read_height);
+        SetDisplayTexture(m_upload_texture.get(), nullptr, 0, 0, read_width, read_height);
         if (is_24bit && g_settings.gpu_24bit_chroma_smoothing)
         {
           if (ApplyChromaSmoothing())
@@ -502,7 +502,7 @@ void GPU_SW::UpdateDisplay()
     {
       if (CopyOut(vram_offset_x, vram_offset_y, skip_x, read_width, read_height, 0, is_24bit))
       {
-        SetDisplayTexture(m_upload_texture.get(), 0, 0, read_width, read_height);
+        SetDisplayTexture(m_upload_texture.get(), nullptr, 0, 0, read_width, read_height);
         if (is_24bit && g_settings.gpu_24bit_chroma_smoothing)
           ApplyChromaSmoothing();
       }
@@ -511,7 +511,7 @@ void GPU_SW::UpdateDisplay()
   else
   {
     if (CopyOut(0, 0, 0, VRAM_WIDTH, VRAM_HEIGHT, 0, false))
-      SetDisplayTexture(m_upload_texture.get(), 0, 0, VRAM_WIDTH, VRAM_HEIGHT);
+      SetDisplayTexture(m_upload_texture.get(), nullptr, 0, 0, VRAM_WIDTH, VRAM_HEIGHT);
   }
 }
 

src/util/postprocessing.cpp

@@ -396,6 +396,7 @@ void PostProcessing::Chain::LoadStages()
   SettingsInterface& si = GetLoadSettingsInterface(m_section);
 
   m_enabled = si.GetBoolValue(m_section, "Enabled", false);
+  m_wants_depth_buffer = false;
 
   const u32 stage_count = Config::GetStageCount(si, m_section);
   if (stage_count == 0)
@@ -441,6 +442,13 @@ void PostProcessing::Chain::LoadStages()
     CheckTargets(g_gpu_device->GetWindowFormat(), g_gpu_device->GetWindowWidth(), g_gpu_device->GetWindowHeight(),
                  &progress);
   }
+
+  // must be down here, because we need to compile first, triggered by CheckTargets()
+  for (std::unique_ptr<Shader>& shader : m_stages)
+    m_wants_depth_buffer |= shader->WantsDepthBuffer();
+  m_needs_depth_buffer = m_enabled && m_wants_depth_buffer;
+  if (m_wants_depth_buffer)
+    DEV_LOG("Depth buffer is needed.");
 }
 
 void PostProcessing::Chain::ClearStages()
@@ -469,6 +477,7 @@ void PostProcessing::Chain::UpdateSettings(std::unique_lock<std::mutex>& setting
   progress.SetProgressRange(stage_count);
 
   const GPUTexture::Format prev_format = m_target_format;
+  m_wants_depth_buffer = false;
 
   for (u32 i = 0; i < stage_count; i++)
   {
@@ -516,6 +525,13 @@ void PostProcessing::Chain::UpdateSettings(std::unique_lock<std::mutex>& setting
     s_timer.Reset();
     DEV_LOG("Loaded {} post-processing stages.", stage_count);
   }
+
+  // must be down here, because we need to compile first, triggered by CheckTargets()
+  for (std::unique_ptr<Shader>& shader : m_stages)
+    m_wants_depth_buffer |= shader->WantsDepthBuffer();
+  m_needs_depth_buffer = m_enabled && m_wants_depth_buffer;
+  if (m_wants_depth_buffer)
+    DEV_LOG("Depth buffer is needed.");
 }
 
 void PostProcessing::Chain::Toggle()
@@ -534,12 +550,13 @@ void PostProcessing::Chain::Toggle()
                                         TRANSLATE_STR("OSDMessage", "Post-processing is now disabled."),
                           Host::OSD_QUICK_DURATION);
   m_enabled = new_enabled;
+  m_needs_depth_buffer = new_enabled && m_wants_depth_buffer;
   if (m_enabled)
     s_timer.Reset();
 }
 
 bool PostProcessing::Chain::CheckTargets(GPUTexture::Format target_format, u32 target_width, u32 target_height,
-                                         ProgressCallback* progress)
+                                         ProgressCallback* progress /* = nullptr */)
 {
   if (m_target_format == target_format && m_target_width == target_width && m_target_height == target_height)
     return true;
@@ -562,6 +579,8 @@ bool PostProcessing::Chain::CheckTargets(GPUTexture::Format target_format, u32 t
   progress->SetProgressRange(static_cast<u32>(m_stages.size()));
   progress->SetProgressValue(0);
 
+  m_wants_depth_buffer = false;
+
   for (size_t i = 0; i < m_stages.size(); i++)
   {
     Shader* const shader = m_stages[i].get();
@@ -580,11 +599,13 @@ bool PostProcessing::Chain::CheckTargets(GPUTexture::Format target_format, u32 t
     }
 
     progress->SetProgressValue(static_cast<u32>(i + 1));
+    m_wants_depth_buffer |= shader->WantsDepthBuffer();
   }
 
   m_target_format = target_format;
   m_target_width = target_width;
   m_target_height = target_height;
+  m_needs_depth_buffer = m_enabled && m_wants_depth_buffer;
   return true;
 }
 
@@ -598,21 +619,24 @@ void PostProcessing::Chain::DestroyTextures()
   g_gpu_device->RecycleTexture(std::move(m_input_texture));
 }
 
-bool PostProcessing::Chain::Apply(GPUTexture* input_color, GPUTexture* final_target, s32 final_left, s32 final_top,
-                                  s32 final_width, s32 final_height, s32 orig_width, s32 orig_height, s32 native_width,
-                                  s32 native_height)
+bool PostProcessing::Chain::Apply(GPUTexture* input_color, GPUTexture* input_depth, GPUTexture* final_target,
+                                  s32 final_left, s32 final_top, s32 final_width, s32 final_height, s32 orig_width,
+                                  s32 orig_height, s32 native_width, s32 native_height)
 {
   GL_SCOPE_FMT("{} Apply", m_section);
 
   GPUTexture* output = m_output_texture.get();
   input_color->MakeReadyForSampling();
+  if (input_depth)
+    input_depth->MakeReadyForSampling();
 
   for (const std::unique_ptr<Shader>& stage : m_stages)
   {
     const bool is_final = (stage.get() == m_stages.back().get());
 
-    if (!stage->Apply(input_color, is_final ? final_target : output, final_left, final_top, final_width, final_height,
-                      orig_width, orig_height, native_width, native_height, m_target_width, m_target_height))
+    if (!stage->Apply(input_color, input_depth, is_final ? final_target : output, final_left, final_top, final_width,
+                      final_height, orig_width, orig_height, native_width, native_height, m_target_width,
+                      m_target_height))
     {
       return false;
     }

src/util/postprocessing.h

@@ -115,6 +115,7 @@ public:
   ~Chain();
 
   ALWAYS_INLINE bool HasStages() const { return m_stages.empty(); }
+  ALWAYS_INLINE bool NeedsDepthBuffer() const { return m_needs_depth_buffer; }
   ALWAYS_INLINE GPUTexture* GetInputTexture() const { return m_input_texture.get(); }
   ALWAYS_INLINE GPUTexture* GetOutputTexture() const { return m_output_texture.get(); }
 
@@ -133,8 +134,8 @@ public:
   bool CheckTargets(GPUTexture::Format target_format, u32 target_width, u32 target_height,
                     ProgressCallback* progress = nullptr);
 
-  bool Apply(GPUTexture* input_color, GPUTexture* final_target, s32 final_left, s32 final_top, s32 final_width,
-             s32 final_height, s32 orig_width, s32 orig_height, s32 native_width, s32 native_height);
+  bool Apply(GPUTexture* input_color, GPUTexture* input_depth, GPUTexture* final_target, s32 final_left, s32 final_top,
+             s32 final_width, s32 final_height, s32 orig_width, s32 orig_height, s32 native_width, s32 native_height);
 
 private:
   void ClearStagesWithError(const Error& error);
@@ -145,6 +146,8 @@ private:
   u32 m_target_width = 0;
   u32 m_target_height = 0;
   bool m_enabled = false;
+  bool m_wants_depth_buffer = false;
+  bool m_needs_depth_buffer = false;
 
   std::vector<std::unique_ptr<PostProcessing::Shader>> m_stages;
   std::unique_ptr<GPUTexture> m_input_texture;

src/util/postprocessing_shader.h

@@ -37,6 +37,7 @@ public:
   ALWAYS_INLINE bool HasOptions() const { return !m_options.empty(); }
 
   virtual bool IsValid() const = 0;
+  virtual bool WantsDepthBuffer() const = 0;
 
   std::vector<ShaderOption> TakeOptions();
   void LoadOptions(const SettingsInterface& si, const char* section);
@@ -48,9 +49,9 @@ public:
 
   virtual bool CompilePipeline(GPUTexture::Format format, u32 width, u32 height, ProgressCallback* progress) = 0;
 
-  virtual bool Apply(GPUTexture* input, GPUTexture* final_target, s32 final_left, s32 final_top, s32 final_width,
-                     s32 final_height, s32 orig_width, s32 orig_height, s32 native_width, s32 native_height,
-                     u32 target_width, u32 target_height) = 0;
+  virtual bool Apply(GPUTexture* input_color, GPUTexture* input_depth, GPUTexture* final_target, s32 final_left,
+                     s32 final_top, s32 final_width, s32 final_height, s32 orig_width, s32 orig_height,
+                     s32 native_width, s32 native_height, u32 target_width, u32 target_height) = 0;
 
 protected:
   static void ParseKeyValue(std::string_view line, std::string_view* key, std::string_view* value);

src/util/postprocessing_shader_fx.cpp

@@ -1,5 +1,4 @@
 // SPDX-FileCopyrightText: 2019-2024 Connor McLaughlin <stenzek@gmail.com>
-// SPDX-FileCopyrightText: 2019-2024 Connor McLaughlin <stenzek@gmail.com>
 // SPDX-License-Identifier: (GPL-3.0 OR CC-BY-NC-ND-4.0)
 
 #include "postprocessing_shader_fx.h"
@@ -12,6 +11,7 @@
 #include "core/settings.h"
 
 #include "common/assert.h"
+#include "common/bitutils.h"
 #include "common/error.h"
 #include "common/file_system.h"
 #include "common/log.h"
@@ -368,6 +368,11 @@ bool PostProcessing::ReShadeFXShader::IsValid() const
   return m_valid;
 }
 
+bool PostProcessing::ReShadeFXShader::WantsDepthBuffer() const
+{
+  return m_wants_depth_buffer;
+}
+
 bool PostProcessing::ReShadeFXShader::CreateModule(s32 buffer_width, s32 buffer_height, reshadefx::module* mod,
                                                    std::string code, Error* error)
 {
@@ -396,6 +401,10 @@ bool PostProcessing::ReShadeFXShader::CreateModule(s32 buffer_width, s32 buffer_
   pp.add_macro_definition("BUFFER_RCP_WIDTH", std::to_string(1.0f / static_cast<float>(buffer_width)));
   pp.add_macro_definition("BUFFER_RCP_HEIGHT", std::to_string(1.0f / static_cast<float>(buffer_height)));
   pp.add_macro_definition("BUFFER_COLOR_BIT_DEPTH", "32");
+  pp.add_macro_definition("RESHADE_DEPTH_INPUT_IS_UPSIDE_DOWN", "0");
+  pp.add_macro_definition("RESHADE_DEPTH_INPUT_IS_LOGARITHMIC", "0");
+  pp.add_macro_definition("RESHADE_DEPTH_LINEARIZATION_FAR_PLANE", "1000.0");
+  pp.add_macro_definition("RESHADE_DEPTH_INPUT_IS_REVERSED", "0");
 
   switch (GetRenderAPI())
   {
@@ -435,7 +444,7 @@ bool PostProcessing::ReShadeFXShader::CreateModule(s32 buffer_width, s32 buffer_
 
   cg->write_result(*mod);
 
-  // FileSystem::WriteBinaryFile("D:\\out.txt", mod->code.data(), mod->code.size());
+  FileSystem::WriteBinaryFile("D:\\out.txt", mod->code.data(), mod->code.size());
   return true;
 }
 
@@ -837,11 +846,16 @@ bool PostProcessing::ReShadeFXShader::GetSourceOption(const reshadefx::uniform_i
       *si = (ui.type.base == reshadefx::type::t_float) ? SourceOptionType::RandomF : SourceOptionType::Random;
       return true;
     }
-    else if (source == "overlay_active" || source == "has_depth")
+    else if (source == "overlay_active")
     {
       *si = SourceOptionType::Zero;
       return true;
     }
+    else if (source == "has_depth")
+    {
+      *si = SourceOptionType::HasDepth;
+      return true;
+    }
     else if (source == "bufferwidth")
     {
       *si = (ui.type.base == reshadefx::type::t_float) ? SourceOptionType::BufferWidthF : SourceOptionType::BufferWidth;
@@ -1185,8 +1199,8 @@ bool PostProcessing::ReShadeFXShader::CreatePasses(GPUTexture::Format backbuffer
             }
             else if (ti.semantic == "DEPTH")
             {
-              WARNING_LOG("Shader '{}' uses input depth as '{}' which is not supported.", m_name, si.texture_name);
               sampler.texture_id = INPUT_DEPTH_TEXTURE;
+              m_wants_depth_buffer = true;
               break;
             }
             else if (!ti.semantic.empty())
@@ -1252,18 +1266,18 @@ const char* PostProcessing::ReShadeFXShader::GetTextureNameForID(TextureID id) c
     return m_textures[static_cast<size_t>(id)].reshade_name.c_str();
 }
 
-GPUTexture* PostProcessing::ReShadeFXShader::GetTextureByID(TextureID id, GPUTexture* input,
-                                                            GPUTexture* final_target) const
+GPUTexture* PostProcessing::ReShadeFXShader::GetTextureByID(TextureID id, GPUTexture* input_color,
+                                                            GPUTexture* input_depth, GPUTexture* final_target) const
 {
   if (id < 0)
   {
     if (id == INPUT_COLOR_TEXTURE)
     {
-      return input;
+      return input_color;
     }
     else if (id == INPUT_DEPTH_TEXTURE)
     {
-      return PostProcessing::GetDummyTexture();
+      return input_depth ? input_depth : GetDummyTexture();
     }
     else if (id == OUTPUT_COLOR_TEXTURE)
     {
@@ -1291,6 +1305,7 @@ bool PostProcessing::ReShadeFXShader::CompilePipeline(GPUTexture::Format format,
   m_valid = false;
   m_textures.clear();
   m_passes.clear();
+  m_wants_depth_buffer = false;
 
   std::string fxcode;
   if (!PreprocessorReadFileCallback(m_filename, fxcode))
@@ -1474,9 +1489,10 @@ bool PostProcessing::ReShadeFXShader::ResizeOutput(GPUTexture::Format format, u3
   return true;
 }
 
-bool PostProcessing::ReShadeFXShader::Apply(GPUTexture* input, GPUTexture* final_target, s32 final_left, s32 final_top,
-                                            s32 final_width, s32 final_height, s32 orig_width, s32 orig_height,
-                                            s32 native_width, s32 native_height, u32 target_width, u32 target_height)
+bool PostProcessing::ReShadeFXShader::Apply(GPUTexture* input_color, GPUTexture* input_depth, GPUTexture* final_target,
+                                            s32 final_left, s32 final_top, s32 final_width, s32 final_height,
+                                            s32 orig_width, s32 orig_height, s32 native_width, s32 native_height,
+                                            u32 target_width, u32 target_height)
 {
   GL_PUSH_FMT("PostProcessingShaderFX {}", m_name);
 
@@ -1507,6 +1523,13 @@ bool PostProcessing::ReShadeFXShader::Apply(GPUTexture* input, GPUTexture* final
         }
         break;
 
+        case SourceOptionType::HasDepth:
+        {
+          const u32 value = BoolToUInt32(input_depth != nullptr);
+          std::memcpy(dst, &value, sizeof(value));
+        }
+        break;
+
         case SourceOptionType::Timer:
         {
           const float value = static_cast<float>(PostProcessing::GetTimer().GetTimeMilliseconds());
@@ -1750,7 +1773,7 @@ bool PostProcessing::ReShadeFXShader::Apply(GPUTexture* input, GPUTexture* final
     // Sucks doing this twice, but we need to set the RT first (for DX11), and transition layouts (for VK).
     for (const Sampler& sampler : pass.samplers)
     {
-      GPUTexture* const tex = GetTextureByID(sampler.texture_id, input, final_target);
+      GPUTexture* const tex = GetTextureByID(sampler.texture_id, input_color, input_depth, final_target);
       if (tex)
         tex->MakeReadyForSampling();
     }
@@ -1771,7 +1794,7 @@ bool PostProcessing::ReShadeFXShader::Apply(GPUTexture* input, GPUTexture* final
       {
         GL_INS_FMT("Render Target {}: ID {} [{}]", i, pass.render_targets[i],
                    GetTextureNameForID(pass.render_targets[i]));
-        render_targets[i] = GetTextureByID(pass.render_targets[i], input, final_target);
+        render_targets[i] = GetTextureByID(pass.render_targets[i], input_color, input_depth, final_target);
         DebugAssert(render_targets[i]);
       }
 
@@ -1795,8 +1818,8 @@ bool PostProcessing::ReShadeFXShader::Apply(GPUTexture* input, GPUTexture* final
 
       GL_INS_FMT("Texture Sampler {}: ID {} [{}]", sampler.slot, sampler.texture_id,
                  GetTextureNameForID(sampler.texture_id));
-      g_gpu_device->SetTextureSampler(sampler.slot, GetTextureByID(sampler.texture_id, input, final_target),
-                                      sampler.sampler);
+      g_gpu_device->SetTextureSampler(
+        sampler.slot, GetTextureByID(sampler.texture_id, input_color, input_depth, final_target), sampler.sampler);
       bound_textures[sampler.slot] = true;
     }
 
@@ -1811,6 +1834,10 @@ bool PostProcessing::ReShadeFXShader::Apply(GPUTexture* input, GPUTexture* final
     g_gpu_device->Draw(pass.num_vertices, 0);
   }
 
+  // Don't leave any textures bound.
+  for (u32 i = 0; i < GPUDevice::MAX_TEXTURE_SAMPLERS; i++)
+    g_gpu_device->SetTextureSampler(i, nullptr, nullptr);
+
   GL_POP();
   m_frame_timer.Reset();
   return true;

src/util/postprocessing_shader_fx.h

@@ -24,15 +24,16 @@ public:
   ~ReShadeFXShader();
 
   bool IsValid() const override;
+  bool WantsDepthBuffer() const override;
 
   bool LoadFromFile(std::string name, std::string filename, bool only_config, Error* error);
   bool LoadFromString(std::string name, std::string filename, std::string code, bool only_config, Error* error);
 
   bool ResizeOutput(GPUTexture::Format format, u32 width, u32 height) override;
   bool CompilePipeline(GPUTexture::Format format, u32 width, u32 height, ProgressCallback* progress) override;
-  bool Apply(GPUTexture* input, GPUTexture* final_target, s32 final_left, s32 final_top, s32 final_width,
-             s32 final_height, s32 orig_width, s32 orig_height, s32 native_width, s32 native_height, u32 target_width,
-             u32 target_height) override;
+  bool Apply(GPUTexture* input_color, GPUTexture* input_depth, GPUTexture* final_target, s32 final_left, s32 final_top,
+             s32 final_width, s32 final_height, s32 orig_width, s32 orig_height, s32 native_width, s32 native_height,
+             u32 target_width, u32 target_height) override;
 
 private:
   using TextureID = s32;
@@ -45,6 +46,7 @@ private:
   {
     None,
     Zero,
+    HasDepth,
     Timer,
     FrameTime,
     FrameCount,
@@ -98,7 +100,8 @@ private:
   bool CreatePasses(GPUTexture::Format backbuffer_format, reshadefx::module& mod, Error* error);
 
   const char* GetTextureNameForID(TextureID id) const;
-  GPUTexture* GetTextureByID(TextureID id, GPUTexture* input, GPUTexture* final_target) const;
+  GPUTexture* GetTextureByID(TextureID id, GPUTexture* input_color, GPUTexture* input_depth,
+                             GPUTexture* final_target) const;
 
   std::string m_filename;
 
@@ -135,6 +138,7 @@ private:
   std::vector<SourceOption> m_source_options;
   u32 m_uniforms_size = 0;
   bool m_valid = false;
+  bool m_wants_depth_buffer = false;
 
   Common::Timer m_frame_timer;
   u32 m_frame_count = 0;

src/util/postprocessing_shader_glsl.cpp

@@ -62,6 +62,11 @@ bool PostProcessing::GLSLShader::IsValid() const
   return !m_name.empty() && !m_code.empty();
 }
 
+bool PostProcessing::GLSLShader::WantsDepthBuffer() const
+{
+  return false;
+}
+
 u32 PostProcessing::GLSLShader::GetUniformsSize() const
 {
   // lazy packing. todo improve.
@@ -162,9 +167,10 @@ bool PostProcessing::GLSLShader::CompilePipeline(GPUTexture::Format format, u32
   return true;
 }
 
-bool PostProcessing::GLSLShader::Apply(GPUTexture* input, GPUTexture* final_target, s32 final_left, s32 final_top,
-                                       s32 final_width, s32 final_height, s32 orig_width, s32 orig_height,
-                                       s32 native_width, s32 native_height, u32 target_width, u32 target_height)
+bool PostProcessing::GLSLShader::Apply(GPUTexture* input_color, GPUTexture* input_depth, GPUTexture* final_target,
+                                       s32 final_left, s32 final_top, s32 final_width, s32 final_height, s32 orig_width,
+                                       s32 orig_height, s32 native_width, s32 native_height, u32 target_width,
+                                       u32 target_height)
 {
   GL_SCOPE_FMT("GLSL Shader {}", m_name);
 
@@ -181,7 +187,7 @@ bool PostProcessing::GLSLShader::Apply(GPUTexture* input, GPUTexture* final_targ
   }
 
   g_gpu_device->SetPipeline(m_pipeline.get());
-  g_gpu_device->SetTextureSampler(0, input, m_sampler.get());
+  g_gpu_device->SetTextureSampler(0, input_color, m_sampler.get());
   g_gpu_device->SetViewportAndScissor(final_left, final_top, final_width, final_height);
 
   const u32 uniforms_size = GetUniformsSize();

src/util/postprocessing_shader_glsl.h

@@ -17,15 +17,16 @@ public:
   ALWAYS_INLINE const std::string& GetCode() const { return m_code; }
 
   bool IsValid() const override;
+  bool WantsDepthBuffer() const override;
 
   bool LoadFromFile(std::string name, const char* filename, Error* error);
   bool LoadFromString(std::string name, std::string code, Error* error);
 
   bool ResizeOutput(GPUTexture::Format format, u32 width, u32 height) override;
   bool CompilePipeline(GPUTexture::Format format, u32 width, u32 height, ProgressCallback* progress) override;
-  bool Apply(GPUTexture* input, GPUTexture* final_target, s32 final_left, s32 final_top, s32 final_width,
-             s32 final_height, s32 orig_width, s32 orig_height, s32 native_width, s32 native_height, u32 target_width,
-             u32 target_height) override;
+  bool Apply(GPUTexture* input_color, GPUTexture* input_depth, GPUTexture* final_target, s32 final_left, s32 final_top,
+             s32 final_width, s32 final_height, s32 orig_width, s32 orig_height, s32 native_width, s32 native_height,
+             u32 target_width, u32 target_height) override;
 
 private:
   struct CommonUniforms