使用cubemap实现天空盒

main.cpp

@@ -72,19 +72,11 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 
 	glewInit();
 
-	//init fsqgpu program
-	GPUProgram fsqProgram;
-	fsqProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/fullscreenquad.vs");
-	fsqProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/fullscreenquad.fs");
-	fsqProgram.Link();
-	fsqProgram.DetectAttribute("pos");
-	fsqProgram.DetectAttribute("texcoord");
-	fsqProgram.DetectUniform("U_MainTexture");
 
 	//gpu program
 	GPUProgram gpuProgram;
-	gpuProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/forg.vs");
-	gpuProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/forg.fs");
+	gpuProgram.AttachShader(GL_VERTEX_SHADER, "res/shader/skybox.vs");
+	gpuProgram.AttachShader(GL_FRAGMENT_SHADER, "res/shader/skybox.fs");
 	gpuProgram.Link();
 
 	gpuProgram.DetectAttribute("pos");
@@ -93,23 +85,6 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 	gpuProgram.DetectUniform("M");
 	gpuProgram.DetectUniform("V");
 	gpuProgram.DetectUniform("P");
-	gpuProgram.DetectUniform("NM");
-	gpuProgram.DetectUniform("U_AmbientLightColor");
-	gpuProgram.DetectUniform("U_AmbientMaterial");
-	gpuProgram.DetectUniform("U_DiffuseLightColor");
-	gpuProgram.DetectUniform("U_DiffuseMaterial");
-	gpuProgram.DetectUniform("U_DiffuseIntensity");
-	gpuProgram.DetectUniform("U_LightPos");
-	gpuProgram.DetectUniform("U_LightDirection");
-	gpuProgram.DetectUniform("U_Cutoff");
-	gpuProgram.DetectUniform("U_SpecularLightColor");
-	gpuProgram.DetectUniform("U_SpecularMaterial");
-	
-	gpuProgram.DetectUniform("U_FogStart");
-	gpuProgram.DetectUniform("U_FogEnd");
-	gpuProgram.DetectUniform("U_FogColor");
-	gpuProgram.DetectUniform("U_FogDensity");
-
 	
 
 	//init 3d model
@@ -123,47 +98,20 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 		0,0,0,1.0f
 	};
 
-	float ambientLightColor[] = { 0.4f,0.4f,0.4f,1.0f };
-	float ambientMaterial[] = { 0.2f,0.2f,0.2f,1.0f };
-	float diffuseLightColor[] = { 0.1f,0.4f,0.7f,1.0f };
-	float diffuseMaterial[] = { 0.6f, 0.6f, 0.6f, 1.0f };
-	float lightPos[] = { 1.0f,1.0f,0.0f,0.0f };
-	float diffuseIntensity = 1.0f;
-
-	float spotLightDirection[] = { 0.0f, -1.0f, 0.0f, 628.0f };
-	float spotLightCutoff = 5.0f;
-	float specularLightColor[] = { 1.0f,1.0f,1.0f,1.0f };
-	float specularMaterial[] = { 1.0f,1.0f,1.0f,1.0f };
-	float eyePos[] = { 0.0f,0.0f,0.0f };
-
-	float fogStart = 2.0f;
-	float fogEnd = 23.0f;
-	float fogColor[] = { 0.6f, 0.6f, 0.6f, 1.0f };
-	float fogDensity = 0.11;
-
-	glm::mat4 cubeModelMatrix = glm::translate<float>(-2.2f, 0.0f, -4.0f) * glm::rotate(-30.0f, 1.0f, 1.0f, 1.0f);
-	glm::mat4 cubeNormalMatrix = glm::inverseTranspose(cubeModelMatrix);
 
-	glm::mat4 cubeModelMatrix2 = glm::translate<float>(-2.0f, 0.0f, -12.0f) * glm::rotate(-30.0f, 1.0f, 1.0f, 1.0f);
-	glm::mat4 cubeNormalMatrix2 = glm::inverseTranspose(cubeModelMatrix);
-
-	glm::mat4 cubeModelMatrix3 = glm::translate<float>(-0.4f, 0.0f, -20.0f) * glm::rotate(-30.0f, 1.0f, 1.0f, 1.0f);
-	glm::mat4 cubeNormalMatrix3 = glm::inverseTranspose(cubeModelMatrix);
-	//glm::mat4 viewMatrix = glm::lookAt(glm::vec3(1.0f, 0.5f, -10.0f), glm::vec3(0.0f, 0.0f, -1.0f), glm::vec3(0.0f, 1.0f, 0.0f));
+	glm::mat4 cubeModelMatrix;
 	glm::mat4 projectionMatrix = glm::perspective(50.0f, (float)viewportWidth / (float)viewportHeight, 0.1f, 1000.0f);
 
-	//³õʼ»¯fsq
-	FullScreenQuad fsq;
-	fsq.Init();
+	GLuint mainTexture = SOIL_load_OGL_cubemap(
+		"res/image/right.bmp",
+		"res/image/left.bmp",
+		"res/image/top.bmp",
+		"res/image/bottom.bmp",
+		"res/image/back.bmp",
+		"res/image/front.bmp",
+		0, 0, SOIL_FLAG_POWER_OF_TWO
+	);
 
-	//³õʼ»¯2¸öfbo
-	FBO fbo[2];
-	fbo[0].AttachColorBuffer("color", GL_COLOR_ATTACHMENT0, GL_RGBA, viewportWidth, viewportHeight);
-	fbo[0].AttachDepthBuffer("depth", viewportWidth, viewportHeight);
-	fbo[0].Finish();
-	fbo[1].AttachColorBuffer("color", GL_COLOR_ATTACHMENT0, GL_RGBA, viewportWidth, viewportHeight);
-	fbo[1].AttachDepthBuffer("depth", viewportWidth, viewportHeight);
-	fbo[1].Finish();
 
 	ShowWindow(hwnd, SW_SHOW);
 	UpdateWindow(hwnd);
@@ -181,85 +129,19 @@ INT WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
 			TranslateMessage(&msg);
 			DispatchMessage(&msg);
 		}
-		glEnable(GL_DEPTH_TEST);
+		glDisable(GL_DEPTH_TEST);
+		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 		glUseProgram(gpuProgram.mProgram);
-
-		
 		glUniformMatrix4fv(gpuProgram.GetLocation("V"), 1, GL_FALSE, identity);
 		glUniformMatrix4fv(gpuProgram.GetLocation("P"), 1, GL_FALSE, glm::value_ptr(projectionMatrix));
-
-		glUniform4fv(gpuProgram.GetLocation("U_AmbientLightColor"), 1, ambientLightColor);
-		glUniform4fv(gpuProgram.GetLocation("U_AmbientMaterial"), 1, ambientMaterial);
-		glUniform4fv(gpuProgram.GetLocation("U_DiffuseLightColor"), 1, diffuseLightColor);
-		glUniform4fv(gpuProgram.GetLocation("U_DiffuseMaterial"), 1, diffuseMaterial);
-		glUniform1f(gpuProgram.GetLocation("U_DiffuseIntensity"), diffuseIntensity);
-		glUniform4fv(gpuProgram.GetLocation("U_LightPos"), 1, lightPos);
-		glUniform4fv(gpuProgram.GetLocation("U_LightDirection"), 1, spotLightDirection);
-		glUniform1f(gpuProgram.GetLocation("U_Cutoff"), spotLightCutoff);
-		glUniform4fv(gpuProgram.GetLocation("U_SpecularLightColor"), 1, specularLightColor);
-		glUniform4fv(gpuProgram.GetLocation("U_SpecularMaterial"), 1, specularMaterial);
-		glUniform3fv(gpuProgram.GetLocation("U_EyePos"), 1, eyePos);
-		glUniform1f(gpuProgram.GetLocation("U_FogStart"), fogStart);
-		glUniform1f(gpuProgram.GetLocation("U_FogEnd"), fogEnd);
-		glUniform4fv(gpuProgram.GetLocation("U_FogColor"), 1, fogColor);
-
-
-		fbo[0].Bind();
-		fogDensity = 0.11;
-		glUniform1f(gpuProgram.GetLocation("U_FogDensity"), fogDensity);
-		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-		glUniformMatrix4fv(gpuProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(cubeModelMatrix));
-		glUniformMatrix4fv(gpuProgram.GetLocation("NM"), 1, GL_FALSE, glm::value_ptr(cubeNormalMatrix));
-		cube.Bind(gpuProgram.GetLocation("pos"), gpuProgram.GetLocation("texcoord"), gpuProgram.GetLocation("normal"));
-		cube.Draw();
-		glUniformMatrix4fv(gpuProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(cubeModelMatrix2));
-		glUniformMatrix4fv(gpuProgram.GetLocation("NM"), 1, GL_FALSE, glm::value_ptr(cubeNormalMatrix2));
-		cube.Bind(gpuProgram.GetLocation("pos"), gpuProgram.GetLocation("texcoord"), gpuProgram.GetLocation("normal"));
-		cube.Draw();
-		glUniformMatrix4fv(gpuProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(cubeModelMatrix3));
-		glUniformMatrix4fv(gpuProgram.GetLocation("NM"), 1, GL_FALSE, glm::value_ptr(cubeNormalMatrix3));
-		cube.Bind(gpuProgram.GetLocation("pos"), gpuProgram.GetLocation("texcoord"), gpuProgram.GetLocation("normal"));
-		cube.Draw();
-		fbo[0].Unbind();
-
-		fbo[1].Bind();
-		fogDensity = 0.31;
-		glUniform1f(gpuProgram.GetLocation("U_FogDensity"), fogDensity);
-		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 		glUniformMatrix4fv(gpuProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(cubeModelMatrix));
-		glUniformMatrix4fv(gpuProgram.GetLocation("NM"), 1, GL_FALSE, glm::value_ptr(cubeNormalMatrix));
-		cube.Bind(gpuProgram.GetLocation("pos"), gpuProgram.GetLocation("texcoord"), gpuProgram.GetLocation("normal"));
-		cube.Draw();
-		glUniformMatrix4fv(gpuProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(cubeModelMatrix2));
-		glUniformMatrix4fv(gpuProgram.GetLocation("NM"), 1, GL_FALSE, glm::value_ptr(cubeNormalMatrix2));
-		cube.Bind(gpuProgram.GetLocation("pos"), gpuProgram.GetLocation("texcoord"), gpuProgram.GetLocation("normal"));
-		cube.Draw();
-		glUniformMatrix4fv(gpuProgram.GetLocation("M"), 1, GL_FALSE, glm::value_ptr(cubeModelMatrix3));
-		glUniformMatrix4fv(gpuProgram.GetLocation("NM"), 1, GL_FALSE, glm::value_ptr(cubeNormalMatrix3));
+		glBindTexture(GL_TEXTURE_CUBE_MAP, mainTexture);
+		glUniform1i(gpuProgram.GetLocation("U_MainTexture"), 0);
 		cube.Bind(gpuProgram.GetLocation("pos"), gpuProgram.GetLocation("texcoord"), gpuProgram.GetLocation("normal"));
 		cube.Draw();
-		fbo[1].Unbind();
 		glUseProgram(0);
+		glEnable(GL_DEPTH_TEST);
 		glFlush();
-
-
-		
-		glClearColor(0.6f, 0.6f, 0.6f, 1.0f);
-		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-		glActiveTexture(GL_TEXTURE0);
-		
-		glUseProgram(fsqProgram.mProgram);
-		glBindTexture(GL_TEXTURE_2D, fbo[0].GetBuffer("color"));
-		glUniform1i(fsqProgram.GetLocation("U_MainTexture"), 0);
-		fsq.DrawToLeftTop(fsqProgram.GetLocation("pos"), fsqProgram.GetLocation("texcoord"));
-
-		glBindTexture(GL_TEXTURE_2D, fbo[1].GetBuffer("color"));
-		glUniform1i(fsqProgram.GetLocation("U_MainTexture"), 0);
-		fsq.DrawToRightTop(fsqProgram.GetLocation("pos"), fsqProgram.GetLocation("texcoord"));
-
-		glUseProgram(0);
-
-		
 		SwapBuffers(dc);
 	}
 	return 0;

res/shader/skybox.fs

@@ -0,0 +1,9 @@
+
+varying vec3 V_Texcoord;
+
+uniform samplerCube U_MainTexture;
+
+void main()
+{
+	gl_FragColor=textureCube(U_MainTexture, V_Texcoord);
+}

res/shader/skybox.vs

@@ -0,0 +1,14 @@
+attribute vec3 pos;
+attribute vec2 texcoord;
+attribute vec3 normal;
+
+uniform mat4 M;
+uniform mat4 P;
+uniform mat4 V;
+
+varying vec3 V_Texcoord;
+void main()
+{
+	V_Texcoord=pos;//TODO没有明白为啥texcoord就是pos
+	gl_Position=P*V*M*vec4(pos,1.0);
+}

shader3.vcxproj

@@ -82,8 +82,8 @@
     <ClInclude Include="utils.h" />
   </ItemGroup>
   <ItemGroup>
-    <None Include="res\shader\forg.fs" />
-    <None Include="res\shader\forg.vs" />
+    <None Include="res\shader\skybox.fs" />
+    <None Include="res\shader\skybox.vs" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">

shader3.vcxproj.filters

@@ -46,10 +46,10 @@
     </ClInclude>
   </ItemGroup>
   <ItemGroup>
-    <None Include="res\shader\forg.fs">
+    <None Include="res\shader\skybox.fs">
       <Filter>src</Filter>
     </None>
-    <None Include="res\shader\forg.vs">
+    <None Include="res\shader\skybox.vs">
       <Filter>src</Filter>
     </None>
   </ItemGroup>