reimplement postprocessing and fix one shader as example

1 files changed, 119 insertions, 34 deletions

diff --git a/Source/Plugins/Plugin_VideoOGL/Src/PostProcessing.cpp b/Source/Plugins/Plugin_VideoOGL/Src/PostProcessing.cpp
index c69932a355..acf1019350 100644
--- a/Source/Plugins/Plugin_VideoOGL/Src/PostProcessing.cpp
+++ b/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();
-
-		s_shader.Destroy();
-
-		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, s_enable ? s_fbo : 0);
+}
+
+void BlitToScreen()
+{
+	if(!s_enable) return;
+	
+	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);
 	}
+}
 
-	// TODO: Convert PP shaders to GLSL
-	if (s_shader.glprogid != 0)
-	{
-		s_shader.Bind();
-		return true;
+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;
 	}
-	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