膨胀和腐蚀

main.cpp

@@ -72,6 +72,33 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 
 	glewInit();
 
+	//init fsqgpu program
+	GPUProgram originalProgram;
+	originalProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
+	originalProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/fullscreenquad.fs");
+	originalProgram.Link();
+	originalProgram.DetectAttribute("pos");
+	originalProgram.DetectAttribute("texcoord");
+	originalProgram.DetectUniform("U_MainTexture");
+
+	//init erosion program
+	GPUProgram erosionProgram;
+	erosionProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
+	erosionProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/fullscreenquad_erosion.fs");
+	erosionProgram.Link();
+	erosionProgram.DetectAttribute("pos");
+	erosionProgram.DetectAttribute("texcoord");
+	erosionProgram.DetectUniform("U_MainTexture");
+
+	//init dilation program
+	GPUProgram dilationProgram;
+	dilationProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
+	dilationProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/fullscreenquad_dilation.fs");
+	dilationProgram.Link();
+	dilationProgram.DetectAttribute("pos");
+	dilationProgram.DetectAttribute("texcoord");
+	dilationProgram.DetectUniform("U_MainTexture");
+
 	//init gpu program
 	GPUProgram gpuProgram;
 	gpuProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/test.vs");
@@ -106,6 +133,17 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 	glm::mat4 projectionMatrix = glm::perspective(50.0f, 800.0f / 600.0f, 0.1f, 1000.0f);
 	glm::mat4 normalMatrix = glm::inverseTranspose(model);
 
+	//³õʼ»¯fsq
+	FullScreenQuad fsq;
+	fsq.Init();
+
+	//³õʼ»¯FBO
+	FBO fbo;
+	fbo.AttachColorBuffer("color", GL_COLOR_ATTACHMENT0, GL_RGBA, viewportWidth, viewportHeight);
+	fbo.AttachDepthBuffer("depth", viewportWidth, viewportHeight);
+	fbo.Finish();
+
+
 	ShowWindow(hwnd, SW_SHOW);
 	UpdateWindow(hwnd);
 
@@ -128,6 +166,8 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 		glEnable(GL_DEPTH_TEST);
 		glUseProgram(gpuProgram.mProgram);
 
+		fbo.Bind();
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 		glUniformMatrix4fv(gpuProgram.GetLocation("P"), 1, GL_FALSE, glm::value_ptr(projectionMatrix));		
 		glUniform3fv(gpuProgram.GetLocation("U_EyePos"), 1, eyePos);
 		glUniformMatrix4fv(gpuProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(model));
@@ -135,11 +175,29 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 		glUniformMatrix4fv(gpuProgram.GetLocation("NM"), 1, GL_FALSE, glm::value_ptr(normalMatrix));
 		obj.Bind(gpuProgram.GetLocation("pos"), gpuProgram.GetLocation("texcoord"), gpuProgram.GetLocation("normal"));
 		obj.Draw();
-	
+		fbo.Unbind();
 
 		glUseProgram(0);
 		glFlush();
 
+		glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+		
+		
+		glActiveTexture(GL_TEXTURE0);
+		glBindTexture(GL_TEXTURE_2D, fbo.GetBuffer("color"));
+		glUniform1i(originalProgram.GetLocation("U_MainTexture"), 0);
+
+		glUseProgram(originalProgram.mProgram);
+		fsq.DrawToLeftTop(originalProgram.GetLocation("pos"), originalProgram.GetLocation("texcoord"));
+		
+		
+		glUseProgram(erosionProgram.mProgram);
+		fsq.DrawToRightTop(erosionProgram.GetLocation("pos"), erosionProgram.GetLocation("texcoord"));
+		
+		glUseProgram(dilationProgram.mProgram);
+		fsq.DrawToLeftBottom(dilationProgram.GetLocation("pos"), dilationProgram.GetLocation("texcoord"));
+
 		SwapBuffers(dc);
 	}
 	return 0;

res/shader/fullscreenquad_dilation.fs

@@ -0,0 +1,20 @@
+varying vec2 V_Texcoord;
+
+uniform sampler2D U_MainTexture;
+
+void main()
+{
+	vec4 maxValue = vec4(0.0);
+	int coreSize = 2;
+	int halfCoreSize = coreSize / 2;
+	float texelOffset = 1/100.0;
+
+	for(int y=0; y<coreSize; y++){
+		for(int x=0; x<coreSize; x++){
+			vec4 color = texture2D(U_MainTexture, V_Texcoord+vec2((-halfCoreSize+x)*texelOffset, (-halfCoreSize+y)*texelOffset));
+			maxValue = max(maxValue,color);
+		}
+	}
+
+	gl_FragColor=maxValue;
+}

res/shader/fullscreenquad_erosion.fs

@@ -0,0 +1,21 @@
+
+varying vec2 V_Texcoord;
+
+uniform sampler2D U_MainTexture;
+
+void main()
+{
+	vec4 minValue = vec4(1.0);
+	int coreSize = 6;
+	int halfCoreSize = coreSize / 2;
+	float texelOffset = 1/100.0;
+
+	for(int y=0; y<coreSize; y++){
+		for(int x=0; x<coreSize; x++){
+			vec4 color = texture2D(U_MainTexture, V_Texcoord+vec2((-halfCoreSize+x)*texelOffset, (-halfCoreSize+y)*texelOffset));
+			minValue = min(minValue,color);
+		}
+	}
+
+	gl_FragColor=minValue;
+}

shader3.vcxproj

@@ -84,6 +84,8 @@
   <ItemGroup>
     <None Include="res\shader\fullscreenquad.fs" />
     <None Include="res\shader\fullscreenquad.vs" />
+    <None Include="res\shader\fullscreenquad_dilation.fs" />
+    <None Include="res\shader\fullscreenquad_erosion.fs" />
     <None Include="res\shader\test.fs" />
     <None Include="res\shader\test.vs" />
   </ItemGroup>

shader3.vcxproj.filters

@@ -58,5 +58,11 @@
     <None Include="res\shader\fullscreenquad.vs">
       <Filter>src</Filter>
     </None>
+    <None Include="res\shader\fullscreenquad_dilation.fs">
+      <Filter>src</Filter>
+    </None>
+    <None Include="res\shader\fullscreenquad_erosion.fs">
+      <Filter>src</Filter>
+    </None>
   </ItemGroup>
 </Project>