简化blur

main.cpp

@@ -81,23 +81,23 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 	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 vertical program
+	GPUProgram verticalProgram;
+	verticalProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
+	verticalProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/fullscreenquad_gaussian_vertical.fs");
+	verticalProgram.Link();
+	verticalProgram.DetectAttribute("pos");
+	verticalProgram.DetectAttribute("texcoord");
+	verticalProgram.DetectUniform("U_MainTexture");
+
+	//init horizontal program
+	GPUProgram horizontalProgram;
+	horizontalProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
+	horizontalProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/fullscreenquad_gaussian_horizontal.fs");
+	horizontalProgram.Link();
+	horizontalProgram.DetectAttribute("pos");
+	horizontalProgram.DetectAttribute("texcoord");
+	horizontalProgram.DetectUniform("U_MainTexture");
 
 	//init dilation program
 	GPUProgram gaussianProgram;
@@ -245,11 +245,11 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 		fsq.DrawToLeftTop(originalProgram.GetLocation("pos"), originalProgram.GetLocation("texcoord"));
 		
 		
-		glUseProgram(erosionProgram.mProgram);
-		fsq.DrawToRightTop(erosionProgram.GetLocation("pos"), erosionProgram.GetLocation("texcoord"));
+		glUseProgram(verticalProgram.mProgram);
+		fsq.DrawToRightTop(verticalProgram.GetLocation("pos"), verticalProgram.GetLocation("texcoord"));
 		
-		glUseProgram(dilationProgram.mProgram);
-		fsq.DrawToLeftBottom(dilationProgram.GetLocation("pos"), dilationProgram.GetLocation("texcoord"));
+		glUseProgram(horizontalProgram.mProgram);
+		fsq.DrawToLeftBottom(horizontalProgram.GetLocation("pos"), horizontalProgram.GetLocation("texcoord"));
 
 		glUseProgram(gaussianProgram.mProgram);
 		glBindTexture(GL_TEXTURE_2D, fbo2.GetBuffer("color"));

res/shader/fullscreenquad_gaussian_horizontal.fs

@@ -0,0 +1,21 @@
+
+varying vec2 V_Texcoord;
+
+uniform sampler2D U_MainTexture;
+
+void main()
+{
+	//1 2 1
+	//2 4 2
+	//1 2 1
+	vec4 color = vec4(0.0);
+	float texelOffset = 1/100.0;
+	float weight[5] = float[](0.22,0.19,0.12,0.08,0.01);
+
+	for(int i = 0; i < 5; i++){
+		color += texture2D(U_MainTexture, vec2(V_Texcoord.x+texelOffset*i, V_Texcoord.y))*weight[i];
+		color += texture2D(U_MainTexture, vec2(V_Texcoord.x-texelOffset*i, V_Texcoord.y))*weight[i];
+	}
+
+	gl_FragColor = color;
+}

res/shader/fullscreenquad_gaussian_vertical.fs

@@ -0,0 +1,21 @@
+
+varying vec2 V_Texcoord;
+
+uniform sampler2D U_MainTexture;
+
+void main()
+{
+	//1 2 1
+	//2 4 2
+	//1 2 1
+	vec4 color = vec4(0.0);
+	float texelOffset = 1/100.0;
+	float weight[5] = float[](0.22,0.19,0.12,0.08,0.01);
+
+	for(int i = 0; i < 5; i++){
+		color += texture2D(U_MainTexture, vec2(V_Texcoord.x, V_Texcoord.y+texelOffset*i))*weight[i];
+		color += texture2D(U_MainTexture, vec2(V_Texcoord.x, V_Texcoord.y-texelOffset*i))*weight[i];
+	}
+
+	gl_FragColor = color;
+}

shader3.vcxproj

@@ -82,11 +82,9 @@
     <ClInclude Include="utils.h" />
   </ItemGroup>
   <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\fullscreenquad_gaussian.fs" />
+    <None Include="res\shader\fullscreenquad_gaussian_horizontal.fs" />
+    <None Include="res\shader\fullscreenquad_gaussian_vertical.fs" />
     <None Include="res\shader\test.fs" />
     <None Include="res\shader\test.vs" />
   </ItemGroup>

shader3.vcxproj.filters

@@ -52,19 +52,13 @@
     <None Include="res\shader\test.vs">
       <Filter>src</Filter>
     </None>
-    <None Include="res\shader\fullscreenquad.fs">
-      <Filter>src</Filter>
-    </None>
-    <None Include="res\shader\fullscreenquad.vs">
-      <Filter>src</Filter>
-    </None>
-    <None Include="res\shader\fullscreenquad_dilation.fs">
+    <None Include="res\shader\fullscreenquad_gaussian.fs">
       <Filter>src</Filter>
     </None>
-    <None Include="res\shader\fullscreenquad_erosion.fs">
+    <None Include="res\shader\fullscreenquad_gaussian_horizontal.fs">
       <Filter>src</Filter>
     </None>
-    <None Include="res\shader\fullscreenquad_gaussian.fs">
+    <None Include="res\shader\fullscreenquad_gaussian_vertical.fs">
       <Filter>src</Filter>
     </None>
   </ItemGroup>