reimplement postprocessing and fix one shader as example

Data/User/Shaders/invert.txt

@@ -1,7 +1,9 @@
-uniform samplerRECT samp0 : register(s0);
+uniform sampler2D samp9;
 
-void main(out float4 ocol0 : COLOR0, in float2 uv0 : TEXCOORD0)
+out vec4 ocol0;
+in vec2 uv0;
+
+void main()
 {
-  float4 c0 = texRECT(samp0, uv0).rgba;
-  ocol0 = float4(1.0, 1.0, 1.0, 1.0) - c0;
+  ocol0 = vec4(1.0, 1.0, 1.0, 1.0) - texture(samp9, uv0);
 }

Source/Plugins/Plugin_VideoOGL/Src/PostProcessing.cpp

@@ -21,6 +21,7 @@
 #include "GLUtil.h"
 #include "PostProcessing.h"
 #include "ProgramShaderCache.h"
+#include "FramebufferManager.h"
 
 namespace OGL
 {
@@ -30,15 +31,67 @@ namespace PostProcessing
 
 static std::string s_currentShader;
 static SHADER s_shader;
+static bool s_enable;
+
+static u32 s_width;
+static u32 s_height;
+static GLuint s_fbo;
+static GLuint s_texture;
+static GLuint s_vao;
+static GLuint s_vbo;
+
+static char* s_vertex_shader =
+	"in vec2 rawpos;\n"
+	"in vec2 tex0;\n"
+	"out vec2 uv0;\n"
+	"void main(void) {\n"
+	"	gl_Position = vec4(rawpos,0,1);\n"
+	"	uv0 = tex0;\n"
+	"}\n"; 
 
 void Init()
 {
 	s_currentShader = "";
+	s_enable = 0;
+	s_width = 0;
+	s_height = 0;
+	
+	glGenFramebuffers(1, &s_fbo);
+	glGenTextures(1, &s_texture);
+	glBindTexture(GL_TEXTURE_2D, s_texture);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0); // disable mipmaps
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 0, 0, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+	glBindFramebuffer(GL_FRAMEBUFFER, s_fbo);
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, s_texture, 0);
+	FramebufferManager::SetFramebuffer(0);
+	
+	glGenBuffers(1, &s_vbo);
+	glBindBuffer(GL_ARRAY_BUFFER, s_vbo);
+	GLfloat vertices[] = { 
+		-1.f, -1.f, 0.f, 0.f, 
+		-1.f,  1.f, 0.f, 1.f, 
+		 1.f, -1.f, 1.f, 0.f, 
+		 1.f,  1.f, 1.f, 1.f
+	};
+	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+	
+	glGenVertexArrays(1, &s_vao);
+	glBindVertexArray( s_vao );
+	glEnableVertexAttribArray(SHADER_POSITION_ATTRIB);
+	glVertexAttribPointer(SHADER_POSITION_ATTRIB, 2, GL_FLOAT, 0, sizeof(GLfloat)*4, NULL);
+	glEnableVertexAttribArray(SHADER_TEXTURE0_ATTRIB);
+	glVertexAttribPointer(SHADER_TEXTURE0_ATTRIB, 2, GL_FLOAT, 0, sizeof(GLfloat)*4, (GLfloat*)NULL+2);
 }
 
 void Shutdown()
 {
 	s_shader.Destroy();
+	
+	glDeleteFramebuffers(1, &s_vbo);
+	glDeleteTextures(1, &s_texture);
+	
+	glDeleteBuffers(1, &s_vbo);
+	glDeleteVertexArrays(1, &s_vao);
 }
 
 void ReloadShader()
@@ -46,45 +99,77 @@ void ReloadShader()
 	s_currentShader = "";
 }
 
-bool ApplyShader()
+void BindTargetFramebuffer ()
 {
-	if (s_currentShader != File::GetUserPath(D_SHADERS_IDX) + g_ActiveConfig.sPostProcessingShader + ".txt")
-	{
-		// Set immediately to prevent endless recompiles on failure.
-		if (!g_ActiveConfig.sPostProcessingShader.empty())
-			s_currentShader = File::GetUserPath(D_SHADERS_IDX) + g_ActiveConfig.sPostProcessingShader + ".txt";
-		else
-			s_currentShader.clear();
+	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, s_enable ? s_fbo : 0);
+}
 
-		s_shader.Destroy();
+void BlitToScreen()
+{
+	if(!s_enable) return;
 	
-		if (!s_currentShader.empty())
-		{
-			std::string code;
-			if (File::ReadFileToString(true, s_currentShader.c_str(), code))
-			{
-				//if (!ProgramShaderCache::CompileShader(s_shader, "#version130\n...", code.c_str()))
-				//{
-				//	ERROR_LOG(VIDEO, "Failed to compile post-processing shader %s", s_currentShader.c_str());
-				//}
-			}
-			else 
-			{
-				ERROR_LOG(VIDEO, "Failed to load post-processing shader %s - does not exist?", s_currentShader.c_str());
-			}
-		}
+	glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+	glViewport(0, 0, s_width, s_height);
+	
+	glBindVertexArray(s_vao);
+	s_shader.Bind();
+	glActiveTexture(GL_TEXTURE0+9);
+	glBindTexture(GL_TEXTURE_2D, s_texture);
+	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+	glBindTexture(GL_TEXTURE_2D, 0);
+	
+/*	glBindFramebuffer(GL_READ_FRAMEBUFFER, s_fbo);
+	
+	glBlitFramebuffer(rc.left, rc.bottom, rc.right, rc.top,
+			rc.left, rc.bottom, rc.right, rc.top,
+			GL_COLOR_BUFFER_BIT, GL_NEAREST);*/
+}
+
+void Update ( u32 width, u32 height )
+{
+	ApplyShader();
+
+	if(s_enable && (width != s_width || height != s_height)) {
+		s_width = width;
+		s_height = height;
+		
+		// alloc texture for framebuffer
+		glActiveTexture(GL_TEXTURE0+9);
+		glBindTexture(GL_TEXTURE_2D, s_texture);
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+		glBindTexture(GL_TEXTURE_2D, 0);
+	}
+}
+
+void ApplyShader()
+{
+	// shader didn't changed
+	if (s_currentShader == g_ActiveConfig.sPostProcessingShader) return;
+	s_currentShader = g_ActiveConfig.sPostProcessingShader;
+	s_enable = false;
+	s_shader.Destroy();
+	
+	// shader disabled
+	if (g_ActiveConfig.sPostProcessingShader == "") return;
+	
+	// so need to compile shader
+	
+	// loading shader code
+	std::string code;
+	std::string path = File::GetUserPath(D_SHADERS_IDX) + g_ActiveConfig.sPostProcessingShader + ".txt";
+	if(!File::ReadFileToString(true, path.c_str(), code)) {
+		ERROR_LOG(VIDEO, "post-processing shader not found: %s", path.c_str());
+		return;
 	}
 	
-	// TODO: Convert PP shaders to GLSL
-	if (s_shader.glprogid != 0)
-	{
-		s_shader.Bind();
-		return true;
-	}
-	else
-	{
-		return false;
+	// and compile it
+	if (!ProgramShaderCache::CompileShader(s_shader, s_vertex_shader, code.c_str())) {
+		ERROR_LOG(VIDEO, "Failed to compile post-processing shader %s", s_currentShader.c_str());
+		return;
 	}
+	
+	// successful
+	s_enable = true;
 }
 
 }  // namespace

Source/Plugins/Plugin_VideoOGL/Src/PostProcessing.h

@@ -30,9 +30,13 @@ namespace PostProcessing
 void Init();
 void Shutdown();
 
+void BindTargetFramebuffer();
+void BlitToScreen();
+void Update(u32 width, u32 height);
+
 void ReloadShader();
-// Returns false if no shader was applied.
-bool ApplyShader();
+
+void ApplyShader();
 
 }  // namespace
 

Source/Plugins/Plugin_VideoOGL/Src/Render.cpp

@@ -996,6 +996,7 @@ void Renderer::Swap(u32 xfbAddr, FieldType field, u32 fbWidth, u32 fbHeight,cons
 
 	ResetAPIState();
 
+	PostProcessing::Update(s_backbuffer_width, s_backbuffer_height);
 	UpdateDrawRectangle(s_backbuffer_width, s_backbuffer_height);
 	TargetRectangle flipped_trc = GetTargetRectangle();
 
@@ -1004,30 +1005,16 @@ void Renderer::Swap(u32 xfbAddr, FieldType field, u32 fbWidth, u32 fbHeight,cons
 	flipped_trc.top = flipped_trc.bottom;
 	flipped_trc.bottom = tmp;
 	
-	// Textured triangles are necessary because of post-processing shaders
-
-	// Disable all other stages
-	for (int i = 0; i < 8; ++i)
-		OGL::TextureCache::DisableStage(i);
-
-	// Update GLViewPort
-	glViewport(flipped_trc.left, flipped_trc.bottom, flipped_trc.GetWidth(), flipped_trc.GetHeight());
-
 	GL_REPORT_ERRORD();
 
-	// We must call ApplyShader here even if no post proc is selected - it takes
-	// care of disabling it in that case. It returns false in case of no post processing.
-	//bool applyShader = PostProcessing::ApplyShader();
-	// degasus: disabled for blitting
-	
 	// Copy the framebuffer to screen.
 
 	const XFBSourceBase* xfbSource = NULL;
 
 	if(g_ActiveConfig.bUseXFB)
 	{
-		// Render to the real buffer now.
-		glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0); // switch to the window backbuffer
+		// Render to the real/postprocessing buffer now.
+		PostProcessing::BindTargetFramebuffer();
 		
 		// draw each xfb source
 		glBindFramebuffer(GL_READ_FRAMEBUFFER, FramebufferManager::GetXFBFramebuffer());
@@ -1085,8 +1072,8 @@ void Renderer::Swap(u32 xfbAddr, FieldType field, u32 fbWidth, u32 fbHeight,cons
 		// for msaa mode, we must resolve the efb content to non-msaa
 		FramebufferManager::ResolveAndGetRenderTarget(rc);
 		
-		// Render to the real buffer now. (resolve have changed this in msaa mode)
-		glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
+		// Render to the real/postprocessing buffer now. (resolve have changed this in msaa mode)
+		PostProcessing::BindTargetFramebuffer();
 		
 		// always the non-msaa fbo
 		GLuint fb = s_MSAASamples>1?FramebufferManager::GetResolvedFramebuffer():FramebufferManager::GetEFBFramebuffer();
@@ -1097,6 +1084,8 @@ void Renderer::Swap(u32 xfbAddr, FieldType field, u32 fbWidth, u32 fbHeight,cons
 			GL_COLOR_BUFFER_BIT, GL_LINEAR);
 	}
 	
+	PostProcessing::BlitToScreen();
+
 	glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
 
 	// Save screenshot

Source/Plugins/Plugin_VideoOGL/Src/main.cpp

@@ -199,9 +199,9 @@ void VideoBackend::Video_Prepare()
 	VertexShaderManager::Init();
 	PixelShaderManager::Init();
 	ProgramShaderCache::Init();
+	PostProcessing::Init();
 	g_texture_cache = new TextureCache();
 	g_sampler_cache = new SamplerCache();
-	PostProcessing::Init();
 	Renderer::Init();
 	GL_REPORT_ERRORD();
 	VertexLoaderManager::Init();
@@ -231,7 +231,6 @@ void VideoBackend::Video_Cleanup() {
 		DLCache::Shutdown();
 #endif
 		Fifo_Shutdown();
-		PostProcessing::Shutdown();
 
 		// The following calls are NOT Thread Safe
 		// And need to be called from the video thread
@@ -242,6 +241,7 @@ void VideoBackend::Video_Cleanup() {
 		g_sampler_cache = NULL;
 		delete g_texture_cache;
 		g_texture_cache = NULL;
+		PostProcessing::Shutdown();
 		ProgramShaderCache::Shutdown();
 		VertexShaderManager::Shutdown();
 		PixelShaderManager::Shutdown();