g-buffer i geometry pass

cw 9/grk-cw9.vcxproj

@@ -43,6 +43,10 @@
     <None Include="shaders\shader_8_sun.vert" />
     <None Include="shaders\shader_blur.frag" />
     <None Include="shaders\shader_blur.vert" />
+    <None Include="shaders\shader_gbuffer.frag" />
+    <None Include="shaders\shader_gbuffer.vert" />
+    <None Include="shaders\shader_geometrypass.frag" />
+    <None Include="shaders\shader_geometrypass.vert" />
     <None Include="shaders\shader_shadowmapsun.frag" />
     <None Include="shaders\shader_shadowmapsun.vert" />
     <None Include="shaders\shader_skybox.frag" />

cw 9/grk-cw9.vcxproj.filters

@@ -127,5 +127,9 @@
     <None Include="shaders\shader_blur.frag">
       <Filter>Shader Files</Filter>
     </None>
+    <None Include="shaders\shader_gbuffer.frag" />
+    <None Include="shaders\shader_gbuffer.vert" />
+    <None Include="shaders\shader_geometrypass.vert" />
+    <None Include="shaders\shader_geometrypass.frag" />
   </ItemGroup>
 </Project>

cw 9/shaders/shader_blur.frag

@@ -1,32 +1,18 @@
-#version 330 core
-out vec4 FragColor;
-  
-in vec2 TexCoords;
+#version 430 core
+layout (location = 0) out vec3 gPosition;
+layout (location = 1) out vec3 gNormal;
+layout (location = 2) out vec3 gAlbedo;
 
-uniform sampler2D image;
-  
-uniform bool horizontal;
-uniform float weight[5] = float[] (0.227027, 0.1945946, 0.1216216, 0.054054, 0.016216);
+in vec2 TexCoords;
+in vec3 FragPos;
+in vec3 Normal;
 
 void main()
-{             
-    vec2 tex_offset = 1.0 / textureSize(image, 0); // gets size of single texel
-    vec3 result = texture(image, TexCoords).rgb * weight[0]; // current fragment's contribution
-    if(horizontal)
-    {
-        for(int i = 1; i < 5; ++i)
-        {
-            result += texture(image, TexCoords + vec2(tex_offset.x * i, 0.0)).rgb * weight[i];
-            result += texture(image, TexCoords - vec2(tex_offset.x * i, 0.0)).rgb * weight[i];
-        }
-    }
-    else
-    {
-        for(int i = 1; i < 5; ++i)
-        {
-            result += texture(image, TexCoords + vec2(0.0, tex_offset.y * i)).rgb * weight[i];
-            result += texture(image, TexCoords - vec2(0.0, tex_offset.y * i)).rgb * weight[i];
-        }
-    }
-    FragColor = vec4(result, 1.0);
+{    
+    // store the fragment position vector in the first gbuffer texture
+    gPosition = FragPos;
+    // also store the per-fragment normals into the gbuffer
+    gNormal = normalize(Normal);
+    // and the diffuse per-fragment color
+    gAlbedo.rgb = vec3(0.95);
 }

cw 9/shaders/shader_blur.vert

@@ -1,14 +1,27 @@
 #version 430 core
 
-layout(location = 0) in vec3 vertexPosition;
-layout(location = 1) in vec3 vertexNormal;
-layout(location = 2) in vec2 vertexTexCoord;
-
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aNormal;
+layout (location = 2) in vec2 aTexCoords;
 
+out vec3 FragPos;
 out vec2 TexCoords;
+out vec3 Normal;
+
+uniform bool invertedNormals;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
 
 void main()
 {
-	gl_Position = vec4(vertexPosition, 1.0);
-    TexCoords = vertexTexCoord;
+    vec4 viewPos = view * model * vec4(aPos, 1.0);
+    FragPos = viewPos.xyz; 
+    TexCoords = aTexCoords;
+    
+    mat3 normalMatrix = transpose(inverse(mat3(view * model)));
+    Normal = normalMatrix * (invertedNormals ? -aNormal : aNormal);
+    
+    gl_Position = projection * viewPos;
 }

cw 9/shaders/shader_geometrypass.frag

@@ -0,0 +1,48 @@
+#version 330 core
+out vec4 FragColor;
+  
+in vec2 tc;
+
+uniform sampler2D color;
+uniform sampler2D highlight;
+
+float rescale_z(float z){
+	float n = 0.05;
+	float f = 20.;
+	return (2*n*f/(z*(n-f)+n+f))/f;
+}
+float weight[5] = float[] (0.227027, 0.1945946, 0.1216216, 0.054054, 0.016216);
+
+vec4 blur()
+{             
+    vec2 tex_offset = 1.0 / textureSize(color, 0); // gets size of single texel
+    vec3 result = texture(highlight, tc).rgb * weight[0]; // current fragment's contribution
+    bool horizontal = true;
+    if(horizontal)
+    {
+        for(int i = 1; i < 5; ++i)
+        {
+            result += texture(highlight, tc + vec2(tex_offset.x * i, 0.0)).rgb * weight[i];
+            result += texture(highlight, tc - vec2(tex_offset.x * i, 0.0)).rgb * weight[i];
+        }
+    }
+    else
+    {
+        for(int i = 1; i < 5; ++i)
+        {
+            result += texture(highlight, tc + vec2(0.0, tex_offset.y * i)).rgb * weight[i];
+            result += texture(highlight, tc - vec2(0.0, tex_offset.y * i)).rgb * weight[i];
+        }
+    }
+    return vec4(result, 1.0);
+}
+
+void main()
+{             
+    //float depthValue = texture(depthMap, tc).r;
+    //FragColor = vec4(vec3(rescale_z(depthValue)+0.5), 1.0);
+    //FragColor = vec4(vec3((depthValue)+0.5), 1.0);
+    
+    FragColor = vec4(texture(highlight, tc).rgb+texture(color, tc).rgb,1);
+    //FragColor = vec4( (texture(color, tc)-0.98)*50);
+}  

cw 9/shaders/shader_geometrypass.vert

@@ -0,0 +1,14 @@
+#version 430 core
+
+layout(location = 0) in vec3 vertexPosition;
+layout(location = 1) in vec3 vertexNormal;
+layout(location = 2) in vec2 vertexTexCoord;
+
+
+out vec2 tc;
+
+void main()
+{
+	tc = vertexTexCoord;
+	gl_Position = vec4(vertexPosition, 1.0);
+}

cw 9/src/room.hpp

@@ -78,6 +78,8 @@ std::vector<std::string> faces =
 GLuint depthMapFBO;
 GLuint depthMap;
 
+GLuint gBuffer;
+
 GLuint depthMapShipFBO;
 GLuint depthMapShip;
 
@@ -90,6 +92,7 @@ GLuint programTex;
 GLuint programDepth;
 GLuint programSkybox;
 GLuint programBlur;
+GLuint programGeometryPass;
 
 Core::Shader_Loader shaderLoader;
 
@@ -110,6 +113,8 @@ unsigned int colorBuffers[2];
 unsigned int pingpongFBO[2];
 unsigned int pingpongBuffer[2];
 
+unsigned int gPosition, gNormal, gAlbedo;
+
 GLuint VAO,VBO;
 
 float aspectRatio = 1.f;
@@ -396,6 +401,66 @@ void renderShadowapSun(GLuint depthFBO, glm::mat4 light) {
 	glViewport(0, 0, WIDTH, HEIGHT);
 }
 
+void initgBuffer()
+{
+	glGenFramebuffers(1, &gBuffer);
+	glBindFramebuffer(GL_FRAMEBUFFER, gBuffer);
+	// position color buffer
+	glGenTextures(1, &gPosition);
+	glBindTexture(GL_TEXTURE_2D, gPosition);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB16F, WIDTH, HEIGHT, 0, GL_RGB, GL_FLOAT, NULL);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+	// normal color buffer
+	glGenTextures(1, &gNormal);
+	glBindTexture(GL_TEXTURE_2D, gNormal);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F, WIDTH, HEIGHT, 0, GL_RGBA, GL_FLOAT, NULL);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D, gNormal, 0);
+	// color + specular color buffer
+	glGenTextures(1, &gAlbedo);
+	glBindTexture(GL_TEXTURE_2D, gAlbedo);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, WIDTH, HEIGHT, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT2, GL_TEXTURE_2D, gAlbedo, 0);
+
+	unsigned int attachments[3] = { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2 };
+	glDrawBuffers(3, attachments);
+}
+
+void geometryPass()
+{
+	glBindFramebuffer(GL_FRAMEBUFFER, gBuffer);
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	glm::mat4 projection = glm::perspective(glm::radians(camera.Zoom), (float)WIDTH / (float)HEIGHT, 0.1f, 50.0f);
+	glm::mat4 view = camera.GetViewMatrix();
+	glm::mat4 model = glm::mat4(1.0f);
+	glUseProgram(programGeometryPass);
+	shaderGeometryPass.setMat4("projection", projection);
+	shaderGeometryPass.setMat4("view", view);
+	// room cube
+	model = glm::mat4(1.0f);
+	model = glm::translate(model, glm::vec3(0.0, 7.0f, 0.0f));
+	model = glm::scale(model, glm::vec3(7.5f, 7.5f, 7.5f));
+	shaderGeometryPass.setMat4("model", model);
+	shaderGeometryPass.setInt("invertedNormals", 1); // invert normals as we're inside the cube
+	renderCube();
+	shaderGeometryPass.setInt("invertedNormals", 0);
+	// backpack model on the floor
+	model = glm::mat4(1.0f);
+	model = glm::translate(model, glm::vec3(0.0f, 0.5f, 0.0));
+	model = glm::rotate(model, glm::radians(-90.0f), glm::vec3(1.0, 0.0, 0.0));
+	model = glm::scale(model, glm::vec3(1.0f));
+	shaderGeometryPass.setMat4("model", model);
+	backpack.Draw(shaderGeometryPass);
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+}
+
 void initDepthMap()
 {
 	glGenFramebuffers(1, &depthMapFBO);
@@ -640,6 +705,7 @@ void init(GLFWwindow* window)
 	glEnable(GL_DEPTH_TEST);
 	program = shaderLoader.CreateProgram("shaders/shader_9_1.vert", "shaders/shader_9_1.frag");
 	programTest = shaderLoader.CreateProgram("shaders/test.vert", "shaders/test.frag");
+	programGeometryPass = shaderLoader.CreateProgram("shaders/shader_geometrypass.vert", "shaders/shader_geometrypass.frag");
 	programSun = shaderLoader.CreateProgram("shaders/shader_8_sun.vert", "shaders/shader_8_sun.frag");
 	programDepth = shaderLoader.CreateProgram("shaders/shader_shadowmapsun.vert", "shaders/shader_shadowmapsun.frag");
 
@@ -687,6 +753,8 @@ void init(GLFWwindow* window)
 	loadModelToContext("./models/car/car.obj", models::carContext);
 	loadModelToContext("./models/ceramic_vase_02_4k.obj", models::vaseContext);
 
+	initgBuffer();
+
 	initDepthMap();
 	initDepthMapShip();