正片叠加，反正品叠加，dark，light

main.cpp

@@ -44,8 +44,8 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 	RECT rect;
 	rect.left = 0;
 	rect.top = 0;
-	rect.right = 256;
-	rect.bottom = 256;
+	rect.right = 512;
+	rect.bottom = 512;
 	AdjustWindowRect(&rect, WS_OVERLAPPEDWINDOW, FALSE);
 
 	HWND hwnd = CreateWindowEx(NULL, "OpenGL", "RenderWindow", WS_OVERLAPPEDWINDOW, 100, 100, rect.right - rect.left, rect.bottom - rect.top, NULL, NULL, hInstance, NULL);
@@ -72,33 +72,45 @@ 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");
-
-	//¸ß˹ģºý
-	GPUProgram gaussianProgram;
-	gaussianProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
-	gaussianProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/fullscreenquad_gaussian.fs");
-	gaussianProgram.Link();
-	gaussianProgram.DetectAttribute("pos");
-	gaussianProgram.DetectAttribute("texcoord");
-	gaussianProgram.DetectUniform("U_MainTexture");
+	//combine program
+	GPUProgram combineProgram1;
+	combineProgram1.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
+	combineProgram1.AttachShader(GL_FRAGMENT_SHADER, "res/shader/zpdd.fs");
+	combineProgram1.Link();
+	combineProgram1.DetectAttribute("pos");
+	combineProgram1.DetectAttribute("texcoord");
+	combineProgram1.DetectUniform("U_BaseTexture");
+	combineProgram1.DetectUniform("U_BlendTexture");
+
+	//combine program
+	GPUProgram combineProgram2;
+	combineProgram2.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
+	combineProgram2.AttachShader(GL_FRAGMENT_SHADER, "res/shader/zpdd_inverse.fs");
+	combineProgram2.Link();
+	combineProgram2.DetectAttribute("pos");
+	combineProgram2.DetectAttribute("texcoord");
+	combineProgram2.DetectUniform("U_BaseTexture");
+	combineProgram2.DetectUniform("U_BlendTexture");
+
+	//combine program
+	GPUProgram combineProgram3;
+	combineProgram3.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
+	combineProgram3.AttachShader(GL_FRAGMENT_SHADER, "res/shader/zpdd_dark.fs");
+	combineProgram3.Link();
+	combineProgram3.DetectAttribute("pos");
+	combineProgram3.DetectAttribute("texcoord");
+	combineProgram3.DetectUniform("U_BaseTexture");
+	combineProgram3.DetectUniform("U_BlendTexture");
 
 	//combine program
-	GPUProgram combineProgram;
-	combineProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
-	combineProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/normal_blend.fs");
-	combineProgram.Link();
-	combineProgram.DetectAttribute("pos");
-	combineProgram.DetectAttribute("texcoord");
-	combineProgram.DetectUniform("U_BaseTexture");
-	combineProgram.DetectUniform("U_BlendTexture");
+	GPUProgram combineProgram4;
+	combineProgram4.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
+	combineProgram4.AttachShader(GL_FRAGMENT_SHADER, "res/shader/zpdd_light.fs");
+	combineProgram4.Link();
+	combineProgram4.DetectAttribute("pos");
+	combineProgram4.DetectAttribute("texcoord");
+	combineProgram4.DetectUniform("U_BaseTexture");
+	combineProgram4.DetectUniform("U_BlendTexture");
 
 
 	
@@ -127,16 +139,9 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 	FullScreenQuad fsq;
 	fsq.Init();
 
-	//³õʼ»¯FBO
-	FBO fbo[2];
-	fbo[0].AttachColorBuffer("color", GL_COLOR_ATTACHMENT0, GL_RGBA, viewportWidth, viewportHeight);
-	fbo[0].AttachDepthBuffer("depth", viewportWidth, viewportHeight);
-	fbo[1].AttachColorBuffer("color", GL_COLOR_ATTACHMENT0, GL_RGBA, viewportWidth, viewportHeight);
-	fbo[1].AttachDepthBuffer("depth", viewportWidth, viewportHeight);
 
-
-	GLuint head = CreateTextureFromFile("res/image/head.png");
-	GLuint grass = CreateTextureFromFile("res/image/grass.png");
+	GLuint head = CreateTextureFromFile("res/image/wood.bmp");
+	GLuint grass = CreateTextureFromFile("res/image/earth.bmp");
 
 	ShowWindow(hwnd, SW_SHOW);
 	UpdateWindow(hwnd);
@@ -161,24 +166,41 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 		glActiveTexture(GL_TEXTURE0);
 
-		glUseProgram(originalProgram.mProgram);
+		glUseProgram(combineProgram1.mProgram);
+		glActiveTexture(GL_TEXTURE0);
 		glBindTexture(GL_TEXTURE_2D, head);
-		glUniform1i(originalProgram.GetLocation("U_MainTexture"), 0);
-		fsq.DrawToLeftTop(originalProgram.GetLocation("pos"), originalProgram.GetLocation("texcoord"));
+		glUniform1i(combineProgram1.GetLocation("U_BaseTexture"), 0);
+		glActiveTexture(GL_TEXTURE1);
+		glBindTexture(GL_TEXTURE_2D, grass);
+		glUniform1i(combineProgram1.GetLocation("U_BlendTexture"), 1);
+		fsq.DrawToLeftTop(combineProgram1.GetLocation("pos"), combineProgram1.GetLocation("texcoord"));
 
-		glUseProgram(originalProgram.mProgram);
+		glUseProgram(combineProgram2.mProgram);
+		glActiveTexture(GL_TEXTURE0);
+		glBindTexture(GL_TEXTURE_2D, head);
+		glUniform1i(combineProgram2.GetLocation("U_BaseTexture"), 0);
+		glActiveTexture(GL_TEXTURE1);
+		glBindTexture(GL_TEXTURE_2D, grass);
+		glUniform1i(combineProgram2.GetLocation("U_BlendTexture"), 1);
+		fsq.DrawToRightTop(combineProgram2.GetLocation("pos"), combineProgram2.GetLocation("texcoord"));
+
+		glUseProgram(combineProgram3.mProgram);
+		glActiveTexture(GL_TEXTURE0);
+		glBindTexture(GL_TEXTURE_2D, head);
+		glUniform1i(combineProgram3.GetLocation("U_BaseTexture"), 0);
+		glActiveTexture(GL_TEXTURE1);
 		glBindTexture(GL_TEXTURE_2D, grass);
-		glUniform1i(originalProgram.GetLocation("U_MainTexture"), 0);
-		fsq.DrawToRightTop(originalProgram.GetLocation("pos"), originalProgram.GetLocation("texcoord"));
+		glUniform1i(combineProgram3.GetLocation("U_BlendTexture"), 1);
+		fsq.DrawToLeftBottom(combineProgram3.GetLocation("pos"), combineProgram3.GetLocation("texcoord"));
 
-		glUseProgram(combineProgram.mProgram);
+		glUseProgram(combineProgram4.mProgram);
 		glActiveTexture(GL_TEXTURE0);
 		glBindTexture(GL_TEXTURE_2D, head);
-		glUniform1i(combineProgram.GetLocation("U_BaseTexture"), 0);
+		glUniform1i(combineProgram4.GetLocation("U_BaseTexture"), 0);
 		glActiveTexture(GL_TEXTURE1);
 		glBindTexture(GL_TEXTURE_2D, grass);
-		glUniform1i(combineProgram.GetLocation("U_BlendTexture"), 1);
-		fsq.DrawToRightBottom(combineProgram.GetLocation("pos"), combineProgram.GetLocation("texcoord"));
+		glUniform1i(combineProgram4.GetLocation("U_BlendTexture"), 1);
+		fsq.DrawToRightBottom(combineProgram4.GetLocation("pos"), combineProgram4.GetLocation("texcoord"));
 
 		glDisable(GL_BLEND);
 		glFlush();

res/shader/zpdd.fs

@@ -0,0 +1,11 @@
+varying vec2 V_Texcoord;
+
+uniform sampler2D U_BaseTexture;
+uniform sampler2D U_BlendTexture;
+
+void main()
+{
+	vec4 baseColor = texture2D(U_BaseTexture, V_Texcoord);
+	vec4 blendColor = texture2D(U_BlendTexture, V_Texcoord);
+	gl_FragColor = baseColor*blendColor;
+}

res/shader/zpdd_dark.fs

@@ -0,0 +1,11 @@
+varying vec2 V_Texcoord;
+
+uniform sampler2D U_BaseTexture;
+uniform sampler2D U_BlendTexture;
+
+void main()
+{
+	vec4 baseColor = texture2D(U_BaseTexture, V_Texcoord);
+	vec4 blendColor = texture2D(U_BlendTexture, V_Texcoord);
+	gl_FragColor = vec4(1.0)-(vec4(1.0)-baseColor)/blendColor;
+}

res/shader/zpdd_inverse.fs

@@ -0,0 +1,11 @@
+varying vec2 V_Texcoord;
+
+uniform sampler2D U_BaseTexture;
+uniform sampler2D U_BlendTexture;
+
+void main()
+{
+	vec4 baseColor = texture2D(U_BaseTexture, V_Texcoord);
+	vec4 blendColor = texture2D(U_BlendTexture, V_Texcoord);
+	gl_FragColor = vec4(1.0) - ((vec4(1.0)-blendColor) * (vec4(1.0)-baseColor));
+}

res/shader/zpdd_light.fs

@@ -0,0 +1,11 @@
+varying vec2 V_Texcoord;
+
+uniform sampler2D U_BaseTexture;
+uniform sampler2D U_BlendTexture;
+
+void main()
+{
+	vec4 baseColor = texture2D(U_BaseTexture, V_Texcoord);
+	vec4 blendColor = texture2D(U_BlendTexture, V_Texcoord);
+	gl_FragColor = baseColor/(vec4(1.0)-blendColor);
+}

shader3.vcxproj

@@ -82,9 +82,10 @@
     <ClInclude Include="utils.h" />
   </ItemGroup>
   <ItemGroup>
-    <None Include="res\shader\normal_blend.fs" />
-    <None Include="res\shader\test.fs" />
-    <None Include="res\shader\test.vs" />
+    <None Include="res\shader\zpdd.fs" />
+    <None Include="res\shader\zpdd_dark.fs" />
+    <None Include="res\shader\zpdd_inverse.fs" />
+    <None Include="res\shader\zpdd_light.fs" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">

shader3.vcxproj.filters

@@ -46,13 +46,16 @@
     </ClInclude>
   </ItemGroup>
   <ItemGroup>
-    <None Include="res\shader\test.fs">
+    <None Include="res\shader\zpdd.fs">
       <Filter>src</Filter>
     </None>
-    <None Include="res\shader\test.vs">
+    <None Include="res\shader\zpdd_dark.fs">
       <Filter>src</Filter>
     </None>
-    <None Include="res\shader\normal_blend.fs">
+    <None Include="res\shader\zpdd_inverse.fs">
+      <Filter>src</Filter>
+    </None>
+    <None Include="res\shader\zpdd_light.fs">
       <Filter>src</Filter>
     </None>
   </ItemGroup>