- Add initial postprocess shader support to GLDEFS file

src/gl/renderer/gl_postprocess.cpp

@@ -149,6 +149,14 @@ CUSTOM_CVAR(Bool, gl_paltonemap_reverselookup, true, CVAR_ARCHIVE | CVAR_NOINITC
 EXTERN_CVAR(Float, vid_brightness)
 EXTERN_CVAR(Float, vid_contrast)
 
+class PostProcessShaderInstance
+{
+public:
+	FShaderProgram Program;
+	FBufferedUniformSampler InputTexture;
+	FBufferedUniformSampler CustomTexture;
+	FHardwareTexture *HWTexture = nullptr;
+};
 
 void FGLRenderer::RenderScreenQuad()
 {
@@ -166,6 +174,67 @@ void FGLRenderer::PostProcessScene(int fixedcm)
 	ColormapScene(fixedcm);
 	LensDistortScene();
 	ApplyFXAA();
+	RunCustomPostProcessShaders("screen");
+}
+
+void FGLRenderer::RunCustomPostProcessShaders(FString target)
+{
+	for (unsigned int i = 0; i < PostProcessShaders.Size(); i++)
+	{
+		PostProcessShader &shader = PostProcessShaders[i];
+
+		if (shader.Target != target)
+			continue;
+
+		if (!shader.Instance)
+		{
+			shader.Instance = std::make_shared<PostProcessShaderInstance>();
+			shader.Instance->Program.Compile(FShaderProgram::Vertex, "shaders/glsl/screenquad.vp", "", 330); // Hmm, should this use shader.shaderversion?
+			shader.Instance->Program.Compile(FShaderProgram::Fragment, shader.ShaderLumpName.GetChars(), "", shader.ShaderVersion);
+			shader.Instance->Program.SetFragDataLocation(0, "FragColor");
+			shader.Instance->Program.Link(shader.ShaderLumpName.GetChars());
+			shader.Instance->Program.SetAttribLocation(0, "PositionInProjection");
+			shader.Instance->InputTexture.Init(shader.Instance->Program, "InputTexture");
+			shader.Instance->CustomTexture.Init(shader.Instance->Program, "CustomTexture");
+
+			if (shader.Texture)
+				shader.Instance->HWTexture = new FHardwareTexture(shader.Texture->GetWidth(), shader.Texture->GetHeight(), false);
+		}
+
+		FGLDebug::PushGroup(shader.ShaderLumpName.GetChars());
+
+		FGLPostProcessState savedState;
+		savedState.SaveTextureBindings(2);
+
+		mBuffers->BindNextFB();
+		mBuffers->BindCurrentTexture(0);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+		shader.Instance->Program.Bind();
+
+		shader.Instance->InputTexture.Set(0);
+
+		if (shader.Instance->HWTexture)
+		{
+			glActiveTexture(GL_TEXTURE1);
+			glBindTexture(GL_TEXTURE_2D, shader.Instance->HWTexture->GetTextureHandle(0));
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+			glActiveTexture(GL_TEXTURE0);
+
+			shader.Instance->CustomTexture.Set(1);
+		}
+		RenderScreenQuad();
+
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+		mBuffers->NextTexture();
+
+		FGLDebug::PopGroup();
+	}
 }
 
 //-----------------------------------------------------------------------------

src/gl/renderer/gl_renderer.h

@@ -42,6 +42,7 @@ class FPresent3DRowShader;
 class F2DDrawer;
 class FHardwareTexture;
 class FShadowMapShader;
+class PostProcessShaderInstance;
 
 inline float DEG2RAD(float deg)
 {
@@ -85,6 +86,17 @@ enum
 	DM_SKYPORTAL
 };
 
+struct PostProcessShader
+{
+	FString Target;
+	FString ShaderLumpName;
+	int ShaderVersion = 0;
+	FTexture *Texture = nullptr;
+	std::shared_ptr<PostProcessShaderInstance> Instance;
+};
+
+extern TArray<PostProcessShader> PostProcessShaders;
+
 class FGLRenderer
 {
 public:
@@ -171,6 +183,7 @@ public:
 
 	void RenderScreenQuad();
 	void PostProcessScene(int fixedcm);
+	void RunCustomPostProcessShaders(FString target);
 	void AmbientOccludeScene();
 	void UpdateCameraExposure();
 	void BloomScene(int fixedcm);

src/gl/shaders/gl_shader.cpp

@@ -669,63 +669,98 @@ void gl_DestroyUserShaders()
 //
 //==========================================================================
 
+TArray<PostProcessShader> PostProcessShaders;
+
 void gl_ParseHardwareShader(FScanner &sc, int deflump)
 {
-	int type = FTexture::TEX_Any;
-	bool disable_fullbright=false;
-	bool thiswad = false;
-	bool iwad = false;
-	int maplump = -1;
-	FString maplumpname;
-	float speed = 1.f;
-
 	sc.MustGetString();
-	if (sc.Compare("texture")) type = FTexture::TEX_Wall;
+	if (sc.Compare("postprocess"))
-	else if (sc.Compare("flat")) type = FTexture::TEX_Flat;
-	else if (sc.Compare("sprite")) type = FTexture::TEX_Sprite;
-	else sc.UnGet();
-
-	sc.MustGetString();
-	FTextureID no = TexMan.CheckForTexture(sc.String, type);
-	FTexture *tex = TexMan[no];
-
-	sc.MustGetToken('{');
-	while (!sc.CheckToken('}'))
 	{
 		sc.MustGetString();
-		if (sc.Compare("shader"))
+
+		PostProcessShader shaderdesc;
+		shaderdesc.Target = sc.String;
+
+		sc.MustGetToken('{');
+		while (!sc.CheckToken('}'))
 		{
 			sc.MustGetString();
-			maplumpname = sc.String;
+			if (sc.Compare("shader"))
-		}
-		else if (sc.Compare("speed"))
-		{
-			sc.MustGetFloat();
-			speed = float(sc.Float);
-		}
-	}
-	if (!tex)
-	{
-		return;
-	}
-
-	if (maplumpname.IsNotEmpty())
-	{
-		if (tex->bWarped != 0)
-		{
-			Printf("Cannot combine warping with hardware shader on texture '%s'\n", tex->Name.GetChars());
-			return;
-		}
-		tex->gl_info.shaderspeed = speed; 
-		for(unsigned i=0;i<usershaders.Size();i++)
-		{
-			if (!usershaders[i].CompareNoCase(maplumpname))
 			{
-				tex->gl_info.shaderindex = i + FIRST_USER_SHADER;
+				sc.MustGetString();
-				return;
+				shaderdesc.ShaderLumpName = sc.String;
+
+				sc.MustGetNumber();
+				shaderdesc.ShaderVersion = sc.Number;
+			}
+			else if (sc.Compare("texture"))
+			{
+				sc.MustGetString();
+				FTextureID no = TexMan.CheckForTexture(sc.String, FTexture::TEX_Wall);
+				shaderdesc.Texture = TexMan[no];
 			}
 		}
-		tex->gl_info.shaderindex = usershaders.Push(maplumpname) + FIRST_USER_SHADER;
+
+		PostProcessShaders.Push(shaderdesc);
+	}
+	else
+	{
+		int type = FTexture::TEX_Any;
+
+		if (sc.Compare("texture")) type = FTexture::TEX_Wall;
+		else if (sc.Compare("flat")) type = FTexture::TEX_Flat;
+		else if (sc.Compare("sprite")) type = FTexture::TEX_Sprite;
+		else sc.UnGet();
+
+		bool disable_fullbright = false;
+		bool thiswad = false;
+		bool iwad = false;
+		int maplump = -1;
+		FString maplumpname;
+		float speed = 1.f;
+
+		sc.MustGetString();
+		FTextureID no = TexMan.CheckForTexture(sc.String, type);
+		FTexture *tex = TexMan[no];
+
+		sc.MustGetToken('{');
+		while (!sc.CheckToken('}'))
+		{
+			sc.MustGetString();
+			if (sc.Compare("shader"))
+			{
+				sc.MustGetString();
+				maplumpname = sc.String;
+			}
+			else if (sc.Compare("speed"))
+			{
+				sc.MustGetFloat();
+				speed = float(sc.Float);
+			}
+		}
+		if (!tex)
+		{
+			return;
+		}
+
+		if (maplumpname.IsNotEmpty())
+		{
+			if (tex->bWarped != 0)
+			{
+				Printf("Cannot combine warping with hardware shader on texture '%s'\n", tex->Name.GetChars());
+				return;
+			}
+			tex->gl_info.shaderspeed = speed;
+			for (unsigned i = 0; i < usershaders.Size(); i++)
+			{
+				if (!usershaders[i].CompareNoCase(maplumpname))
+				{
+					tex->gl_info.shaderindex = i + FIRST_USER_SHADER;
+					return;
+				}
+			}
+			tex->gl_info.shaderindex = usershaders.Push(maplumpname) + FIRST_USER_SHADER;
+		}
 	}
 }