VideoCommon: add milliseconds elapsed time value to pixel shaders as a uniform to be able to support animation effects in custom shaders

Source/Core/VideoCommon/ConstantManager.h

@@ -58,6 +58,8 @@ struct alignas(16) PixelShaderConstants
   // For shader_framebuffer_fetch logic ops:
   u32 logic_op_enable;  // bool
   LogicOp logic_op_mode;
+  // For custom shaders...
+  u32 time_ms;
 };
 
 struct alignas(16) VertexShaderConstants

Source/Core/VideoCommon/PixelShaderGen.cpp

@@ -406,6 +406,7 @@ void WritePixelShaderCommonHeader(ShaderCode& out, APIType api_type,
             "\tbool  blend_subtract_alpha;\n"
             "\tbool  logic_op_enable;\n"
             "\tuint  logic_op_mode;\n"
+            "\tuint  time_ms;\n"
             "}};\n\n");
   out.Write("#define bpmem_combiners(i) (bpmem_pack1[(i)].xy)\n"
             "#define bpmem_tevind(i) (bpmem_pack1[(i)].z)\n"
@@ -869,6 +870,9 @@ void WriteCustomShaderStructImpl(ShaderCode* out, u32 num_stages, bool per_pixel
   // Actual data will be filled out in the tev stage code, just set the
   // stage count for now
   out->Write("\tcustom_data.tev_stage_count = {};\n", num_stages);
+
+  // Time
+  out->Write("\tcustom_data.time_ms = time_ms;\n");
 }
 
 static void WriteStage(ShaderCode& out, const pixel_shader_uid_data* uid_data, int n,

Source/Core/VideoCommon/ShaderGenCommon.cpp

@@ -447,5 +447,6 @@ void WriteCustomShaderStructDef(ShaderCode* out, u32 numtexgens)
   out->Write("\tCustomShaderTevStage[16] tev_stages;\n");
   out->Write("\tuint tev_stage_count;\n");
   out->Write("\tfloat4 final_color;\n");
+  out->Write("\tuint time_ms;\n");
   out->Write("}};\n\n");
 }

Source/Core/VideoCommon/UberShaderPixel.cpp

@@ -266,6 +266,9 @@ void WriteCustomShaderStructImpl(ShaderCode* out, u32 num_texgen, bool per_pixel
   // Actual data will be filled out in the tev stage code, just set the
   // stage count for now
   out->Write("\tcustom_data.tev_stage_count = num_stages;\n");
+
+  // Time
+  out->Write("\tcustom_data.time_ms = time_ms;\n");
 }
 }  // namespace
 PixelShaderUid GetPixelShaderUid()

Source/Core/VideoCommon/VertexManagerBase.cpp

@@ -15,6 +15,7 @@
 
 #include "Core/ConfigManager.h"
 #include "Core/DolphinAnalytics.h"
+#include "Core/HW/SystemTimers.h"
 #include "Core/System.h"
 
 #include "VideoCommon/AbstractGfx.h"
@@ -107,6 +108,8 @@ VertexManagerBase::~VertexManagerBase() = default;
 bool VertexManagerBase::Initialize()
 {
   m_frame_end_event = AfterFrameEvent::Register([this] { OnEndFrame(); }, "VertexManagerBase");
+  m_after_present_event = AfterPresentEvent::Register(
+      [this](PresentInfo& pi) { m_ticks_elapsed = pi.emulated_timestamp; }, "VertexManagerBase");
   m_index_generator.Init();
   m_custom_shader_cache = std::make_unique<CustomShaderCache>();
   m_cpu_cull.Init();
@@ -526,6 +529,13 @@ void VertexManagerBase::Flush()
   auto& geometry_shader_manager = system.GetGeometryShaderManager();
   auto& vertex_shader_manager = system.GetVertexShaderManager();
 
+  if (g_ActiveConfig.bGraphicMods)
+  {
+    const double seconds_elapsed =
+        static_cast<double>(m_ticks_elapsed) / SystemTimers::GetTicksPerSecond();
+    pixel_shader_manager.constants.time_ms = seconds_elapsed * 1000;
+  }
+
   CalculateBinormals(VertexLoaderManager::GetCurrentVertexFormat());
   // Calculate ZSlope for zfreeze
   const auto used_textures = UsedTextures();

Source/Core/VideoCommon/VertexManagerBase.h

@@ -233,8 +233,10 @@ private:
   bool m_allow_background_execution = true;
 
   std::unique_ptr<CustomShaderCache> m_custom_shader_cache;
+  u64 m_ticks_elapsed;
 
   Common::EventHook m_frame_end_event;
+  Common::EventHook m_after_present_event;
 };
 
 extern std::unique_ptr<VertexManagerBase> g_vertex_manager;

docs/CustomPipelineGraphicsMod.md

@@ -105,6 +105,7 @@ vec4 custom_main( in CustomShaderData data )
 |``tev_stages``               | CustomShaderTevStage[]  | v1    | An array of TEV stages, the amount is specified by ``tev_stage_count``                        |
 |``tev_stage_count``          | uint                    | v1    | The count of TEV stages                                                                       |
 |``final_color``              | vec4                    | v1    | The final color generated by Dolphin after all TEV stages are executed                        |
+|``time_ms``                  | uint                    | v1    | The time that has passed in milliseconds, since the game was started.  Useful for animating   |
 
 `CustomShaderLightData` is used to denote lighting data the game is applying when rendering the specific draw call.  It has the following structure:
 
@@ -247,4 +248,4 @@ vec4 custom_main( in CustomShaderData data )
 	}
 	return vec4(total_diffuse * vec3(0, 0, 1), 1);
 }
-```
+```