提取深度缓冲区

main.cpp

@@ -91,7 +91,7 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 	glewInit();
 
 	/*创建program*/
-	GLuint program = CreateGPUProgram("res/shader/UI FullScreemQuad.vs", "res/shader/SimpleTexture.fs");
+	GLuint program = CreateGPUProgram("res/shader/SimpleTexture.vs", "res/shader/SimpleTexture.fs");
 
 	GLuint posLocation, texcoordLocation, normalLocation, MLocation, VLocation, PLocation, textureLocation;
 	posLocation = glGetAttribLocation(program, "pos");
@@ -108,7 +108,7 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 	int vertexCount = 0, indexCount = 0;
 	Timer t;
 	t.Start();
-	VertexData* vertexes = LoadObjModel("res/model/Quad.obj", &indexes, vertexCount, indexCount);
+	VertexData* vertexes = LoadObjModel("res/model/niutou.obj", &indexes, vertexCount, indexCount);
 	printf("load model cost %fs %d\n", t.GetPassedTime(), t.GetPassedTickers());
 
 	if (vertexes == nullptr) {
@@ -116,18 +116,60 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 	}
 
 	/*创建vbo*/
+	GLuint vao = CreateVAOWithVBOSettings([&]()->void
+	{
 		GLuint vbo = CreateBufferObject(GL_ARRAY_BUFFER, sizeof(VertexData) * vertexCount, GL_STATIC_DRAW, vertexes);
 		glBindBuffer(GL_ARRAY_BUFFER, vbo);
 		glEnableVertexAttribArray(posLocation);
 		glVertexAttribPointer(posLocation, 3, GL_FLOAT, GL_FALSE, sizeof(VertexData), (void*)0);
 		glEnableVertexAttribArray(texcoordLocation);
 		glVertexAttribPointer(texcoordLocation, 2, GL_FLOAT, GL_FALSE, sizeof(VertexData), (void*)(sizeof(float) * 3));
-	/*glEnableVertexAttribArray(normalLocation);
-	glVertexAttribPointer(normalLocation, 3, GL_FLOAT, GL_FALSE, sizeof(VertexData), (void*)(sizeof(float) * 5));*/
-	glBindBuffer(GL_ARRAY_BUFFER, 0);
+	});
 
 	/*创建IBO*/
 	GLuint ibo = CreateBufferObject(GL_ELEMENT_ARRAY_BUFFER, sizeof(unsigned int) * indexCount, GL_STATIC_DRAW, indexes);
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+	
+	/*创建fsqprogram*/
+	GLuint fsqprogram = CreateGPUProgram("res/shader/UI FullScreemQuad.vs", "res/shader/RenderDepthBuffer.fs");
+
+	GLuint fsqposLocation, fsqtexcoordLocation, fsqnormalLocation, fsqMLocation, fsqVLocation, fsqPLocation, fsqtextureLocation;
+	fsqposLocation = glGetAttribLocation(fsqprogram, "pos");
+	fsqtexcoordLocation = glGetAttribLocation(fsqprogram, "texcoord");
+	fsqnormalLocation = glGetAttribLocation(fsqprogram, "normal");
+
+	fsqMLocation = glGetUniformLocation(fsqprogram, "M");
+	fsqVLocation = glGetUniformLocation(fsqprogram, "V");
+	fsqPLocation = glGetUniformLocation(fsqprogram, "P");
+	textureLocation = glGetUniformLocation(program, "U_MainTexture");
+
+	/*load model*/
+	unsigned int *fsqindexes = nullptr;
+	int fsqvertexCount = 0, fsqindexCount = 0;
+	Timer t2;
+	t2.Start();
+	VertexData* fsqvertexes = LoadObjModel("res/model/Quad.obj", &fsqindexes, fsqvertexCount, fsqindexCount);
+	printf("load model cost %fs %d\n", t2.GetPassedTime(), t2.GetPassedTickers());
+
+	if (fsqvertexes == nullptr) {
+		printf("load obj model fail\n");
+	}
+
+	/*创建fsqvbo*/
+	GLuint fsqvao = CreateVAOWithVBOSettings([&]()->void
+	{
+		GLuint fsqvbo = CreateBufferObject(GL_ARRAY_BUFFER, sizeof(VertexData) * fsqvertexCount, GL_STATIC_DRAW, fsqvertexes);
+		glBindBuffer(GL_ARRAY_BUFFER, fsqvbo);
+		glEnableVertexAttribArray(fsqposLocation);
+		glVertexAttribPointer(fsqposLocation, 3, GL_FLOAT, GL_FALSE, sizeof(VertexData), (void*)0);
+		glEnableVertexAttribArray(fsqtexcoordLocation);
+		glVertexAttribPointer(fsqtexcoordLocation, 2, GL_FLOAT, GL_FALSE, sizeof(VertexData), (void*)(sizeof(float) * 3));
+	});
+
+	/*创建fsqIBO*/
+	GLuint fsqibo = CreateBufferObject(GL_ELEMENT_ARRAY_BUFFER, sizeof(unsigned int) * fsqindexCount, GL_STATIC_DRAW, fsqindexes);
+	glBindBuffer(GL_ARRAY_BUFFER, 0);
+
 
 	/*创建纹理*/
 	GLuint mainTexture = CreateTextureFromFile("res/image/niutou.bmp");
@@ -161,7 +203,6 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 	MSG msg;
 
 	auto what = [&]()->void {
-		glm::mat4 normalMatrix = glm::inverseTranspose(model);
 
 		glUseProgram(program);
 		glUniformMatrix4fv(MLocation, 1, GL_FALSE, glm::value_ptr(model));
@@ -171,10 +212,23 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 		glBindTexture(GL_TEXTURE_2D, mainTexture);
 		glUniform1i(textureLocation, 0);
 
+		glBindVertexArray(vao);
 		glUniformMatrix4fv(MLocation, 1, GL_FALSE, glm::value_ptr(model));
 		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
 		glDrawElements(GL_TRIANGLES, indexCount, GL_UNSIGNED_INT, 0);
+		glBindVertexArray(0);
+		glUseProgram(0);
+	};
 
+	auto RenderFullScreenQuad = [&]()->void {
+		glUseProgram(fsqprogram);
+
+		glBindVertexArray(fsqvao);
+		glBindTexture(GL_TEXTURE_2D, depthBuffer);
+		glUniform1i(fsqtextureLocation, 0);
+		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, fsqibo);
+		glDrawElements(GL_TRIANGLES, fsqindexCount, GL_UNSIGNED_INT, 0);
+		glBindVertexArray(0);
 		glUseProgram(0);
 	};
 
@@ -199,15 +253,7 @@ INT WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine
 		glBindFramebuffer(GL_FRAMEBUFFER, 0);
 		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
-		glEnable(GL_TEXTURE_2D);
-		glBindTexture(GL_TEXTURE_2D, colorBuffer);
-
-		glBegin(GL_QUADS);
-		glTexCoord2f(0.0f, 0.0f); glVertex3f(-0.5f, -0.5f, -2.0f);
-		glTexCoord2f(1.0f, 0.0f); glVertex3f(0.5f, -0.5f, -2.0f);
-		glTexCoord2f(1.0f, 1.0f); glVertex3f(0.5f, 0.5f, -2.0f);
-		glTexCoord2f(0.0f, 1.0f); glVertex3f(-0.5f, 0.5f, -2.0f);
-		glEnd();
+		RenderFullScreenQuad();
 
 		glFlush();
 		SwapBuffers(dc);

res/shader/RenderDepthBuffer.fs

@@ -0,0 +1,9 @@
+
+uniform sampler2D U_MainTexture;
+varying vec2 V_Texcoord;
+
+void main()
+{
+	float depthValue=pow(texture2D(U_MainTexture,V_Texcoord).r,8.0);
+    gl_FragColor=vec4(vec3(depthValue),1.0);
+}

shader2.vcxproj

@@ -159,6 +159,7 @@
     <ClInclude Include="timer.h" />
   </ItemGroup>
   <ItemGroup>
+    <None Include="res\shader\RenderDepthBuffer.fs" />
     <None Include="res\shader\SimpleTexture.fs" />
     <None Include="res\shader\SimpleTexture.vs" />
     <None Include="res\shader\UI FullScreemQuad.vs" />

shader2.vcxproj.filters

@@ -55,5 +55,8 @@
     <None Include="res\shader\UI FullScreemQuad.vs">
       <Filter>源文件</Filter>
     </None>
+    <None Include="res\shader\RenderDepthBuffer.fs">
+      <Filter>源文件</Filter>
+    </None>
   </ItemGroup>
 </Project>