Refactor custom shaders to abstract binding differences. Closes #2458

* Newly written shaders and any updated shaders can now use pre-defined macros
  to abstract away binding differences between APIs, so custom shaders will be
  more portable in particular shaders written in HLSL for D3D or GLSL on OpenGL
  won't break on vulkan because they refer to incorrect binds.

renderdoc/replay/dummy_driver.cpp

@@ -42,6 +42,7 @@ DummyDriver::DummyDriver(IReplayDriver *original, const rdcarray<ShaderReflectio
   m_GPUs = original->GetAvailableGPUs();
   m_WindowSystems = original->GetSupportedWindowSystems();
   m_CustomEncodings = original->GetCustomShaderEncodings();
+  m_CustomPrefixes = original->GetCustomShaderSourcePrefixes();
 }
 
 DummyDriver::~DummyDriver()
@@ -478,7 +479,12 @@ void DummyDriver::BuildCustomShader(ShaderEncoding sourceEncoding, const bytebuf
 
 rdcarray<ShaderEncoding> DummyDriver::GetCustomShaderEncodings()
 {
-  return {ShaderEncoding::HLSL, ShaderEncoding::GLSL};
+  return m_CustomEncodings;
+}
+
+rdcarray<ShaderSourcePrefix> DummyDriver::GetCustomShaderSourcePrefixes()
+{
+  return m_CustomPrefixes;
 }
 
 ResourceId DummyDriver::ApplyCustomShader(TextureDisplay &display)

renderdoc/replay/dummy_driver.h

@@ -167,6 +167,7 @@ public:
                          const ShaderCompileFlags &compileFlags, ShaderStage type, ResourceId &id,
                          rdcstr &errors);
   rdcarray<ShaderEncoding> GetCustomShaderEncodings();
+  rdcarray<ShaderSourcePrefix> GetCustomShaderSourcePrefixes();
   ResourceId ApplyCustomShader(TextureDisplay &display);
   void FreeCustomShader(ResourceId id);
 
@@ -195,4 +196,5 @@ private:
   rdcarray<GPUDevice> m_GPUs;
   rdcarray<WindowingSystem> m_WindowSystems;
   rdcarray<ShaderEncoding> m_CustomEncodings;
+  rdcarray<ShaderSourcePrefix> m_CustomPrefixes;
 };

renderdoc/replay/replay_controller.cpp

@@ -1955,6 +1955,13 @@ rdcarray<ShaderEncoding> ReplayController::GetCustomShaderEncodings()
   return m_pDevice->GetCustomShaderEncodings();
 }
 
+rdcarray<ShaderSourcePrefix> ReplayController::GetCustomShaderSourcePrefixes()
+{
+  CHECK_REPLAY_THREAD();
+
+  return m_pDevice->GetCustomShaderSourcePrefixes();
+}
+
 rdcarray<ShaderEncoding> ReplayController::GetTargetShaderEncodings()
 {
   CHECK_REPLAY_THREAD();

renderdoc/replay/replay_controller.h

@@ -153,6 +153,7 @@ public:
   void FreeCustomShader(ResourceId id);
 
   rdcarray<ShaderEncoding> GetCustomShaderEncodings();
+  rdcarray<ShaderSourcePrefix> GetCustomShaderSourcePrefixes();
   rdcarray<ShaderEncoding> GetTargetShaderEncodings();
   rdcpair<ResourceId, rdcstr> BuildTargetShader(const rdcstr &entry, ShaderEncoding sourceEncoding,
                                                 bytebuf source,

renderdoc/replay/replay_driver.h

@@ -269,6 +269,7 @@ public:
                                  const rdcstr &entry, const ShaderCompileFlags &compileFlags,
                                  ShaderStage type, ResourceId &id, rdcstr &errors) = 0;
   virtual rdcarray<ShaderEncoding> GetCustomShaderEncodings() = 0;
+  virtual rdcarray<ShaderSourcePrefix> GetCustomShaderSourcePrefixes() = 0;
   virtual ResourceId ApplyCustomShader(TextureDisplay &display) = 0;
   virtual void FreeCustomShader(ResourceId id) = 0;