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shaders/shader_parallax.frag

@@ -0,0 +1,85 @@
+#version 330 core
+out vec4 FragColor;
+
+in VS_OUT {
+    vec3 FragPos;
+    vec2 TexCoords;
+    vec3 TangentLightPos;
+    vec3 TangentViewPos;
+    vec3 TangentFragPos;
+} fs_in;
+
+uniform sampler2D diffuseTexture;
+uniform sampler2D normalTexture;
+uniform sampler2D depthTexture;
+
+uniform float heightScale;
+
+vec2 ParallaxMapping(vec2 texCoords, vec3 viewDir)
+{ 
+    // number of depth layers
+    const float minLayers = 8;
+    const float maxLayers = 32;
+    float numLayers = mix(maxLayers, minLayers, abs(dot(vec3(0.0, 0.0, 1.0), viewDir)));  
+    // calculate the size of each layer
+    float layerDepth = 1.0 / numLayers;
+    // depth of current layer
+    float currentLayerDepth = 0.0;
+    // the amount to shift the texture coordinates per layer (from vector P)
+    vec2 P = viewDir.xy / viewDir.z * heightScale; 
+    vec2 deltaTexCoords = P / numLayers;
+  
+    // get initial values
+    vec2  currentTexCoords     = texCoords;
+    float currentdepthTextureValue = texture(depthTexture, currentTexCoords).r;
+      
+    while(currentLayerDepth < currentdepthTextureValue)
+    {
+        // shift texture coordinates along direction of P
+        currentTexCoords -= deltaTexCoords;
+        // get depthTexture value at current texture coordinates
+        currentdepthTextureValue = texture(depthTexture, currentTexCoords).r;  
+        // get depth of next layer
+        currentLayerDepth += layerDepth;  
+    }
+    
+    // get texture coordinates before collision (reverse operations)
+    vec2 prevTexCoords = currentTexCoords + deltaTexCoords;
+
+    // get depth after and before collision for linear interpolation
+    float afterDepth  = currentdepthTextureValue - currentLayerDepth;
+    float beforeDepth = texture(depthTexture, prevTexCoords).r - currentLayerDepth + layerDepth;
+ 
+    // interpolation of texture coordinates
+    float weight = afterDepth / (afterDepth - beforeDepth);
+    vec2 finalTexCoords = prevTexCoords * weight + currentTexCoords * (1.0 - weight);
+
+    return finalTexCoords;
+}
+
+void main()
+{    
+    vec3 fragColor = vec3(0,0,0);
+    vec3 viewDir = normalize(fs_in.TangentViewPos - fs_in.TangentFragPos);
+    vec2 texCoords = ParallaxMapping(fs_in.TexCoords,  viewDir);  
+    if(texCoords.x > 1.0 || texCoords.y > 1.0 || texCoords.x < 0.0 || texCoords.y < 0.0)
+        discard;
+    
+    vec3 texture = texture2D(diffuseTexture, texCoords).rgb;
+    vec3 ambient = vec3(0.1, 0.1, 0.1) * texture;
+
+    // obtain normal from normal map
+    vec3 normal = texture2D(normalTexture, texCoords).rgb;
+    normal = normalize(normal * 2.0 - 1.0);   
+
+    vec3 lightDir = normalize(fs_in.TangentLightPos[0] - fs_in.TangentFragPos);
+    float diff = max(0,dot(normal,normalize(lightDir)));
+    vec3 diffuse = diff * texture;
+    // specular    
+    vec3 reflectDir = reflect(-lightDir, normal);
+    vec3 halfwayDir = normalize(lightDir + viewDir);  
+    float spec = pow(max(dot(normal, halfwayDir), 0.0), 32.0);
+
+    vec3 specular = vec3(0.2) * spec;
+    FragColor = vec4(ambient + diffuse + specular, 1.0);
+}

shaders/shader_parallax.vert

@@ -0,0 +1,44 @@
+#version 330 core
+layout(location = 0) in vec3 vertexPosition;
+layout(location = 1) in vec2 vertexTexCoord;
+layout(location = 2) in vec3 vertexNormal;
+layout (location = 3) in vec3 aTangent;
+layout (location = 4) in vec3 aBitangent;
+
+out VS_OUT {
+    vec3 FragPos;
+    vec2 TexCoords;
+    vec3 TangentLightPos;
+    vec3 TangentViewPos;
+    vec3 TangentFragPos;
+} vs_out;
+
+uniform mat4 projection;
+uniform mat4 view;
+uniform mat4 modelMatrix;
+uniform mat4 transformation;
+
+
+uniform vec3 lightPos;
+uniform vec3 viewPos;
+
+void main()
+{
+    gl_Position = transformation * vec4(vertexPosition, 1.0);
+    mat3 normalMatrix = transpose(inverse(mat3(modelMatrix)));
+
+    gl_Position      = projection * view * modelMatrix * vec4(vertexPosition, 1.0);
+    vs_out.FragPos = vec3(modelMatrix * vec4(vertexPosition, 1.0));   
+    vs_out.TexCoords = vertexTexCoord;   
+    
+    vec3 T = normalize(normalMatrix * aTangent);
+	vec3 N = normalize(normalMatrix * vertexNormal);
+	T = normalize(T - dot(T, N) * N);
+	vec3 B = cross(N, T);
+
+	mat3 TBN = mat3(T, B, N);
+
+    vs_out.TangentLightPos = TBN * lightPos;
+    vs_out.TangentViewPos  = TBN * viewPos;
+    vs_out.TangentFragPos  = (modelMatrix*vec4(vertexPosition,1)).xyz;
+}

src/main.cpp

@@ -36,6 +36,7 @@ GLuint programBloom;
 GLuint programNormal;
 GLuint programParticle;
 GLuint programAsteroid;
+GLuint programParallax;
 
 //bloompart
 unsigned int pingpongFBO[2];
@@ -56,6 +57,8 @@ bool bothEngines = true;
 //textures
 GLuint sunTexture;
 GLuint earthTexture;
+GLuint earthNormalTexture;
+GLuint earthSpecularTexture;
 GLuint marsTexture;
 GLuint moonTexture;
 GLuint skyboxTexture;
@@ -133,6 +136,10 @@ struct Object
 	glm::mat4 invModelM;
 	std::shared_ptr<Model> modelParent;
 	GLuint textureID;
+	//part for parallax mapping
+	GLuint textureNormal = -1;
+	GLuint textureSpecular = -1;
+	//end of part
 	GLuint shaderID;
 	glm::vec3 color;
 };
@@ -220,6 +227,8 @@ void renderQuad()
 			 1.0f,  1.0f, 0.0f, 1.0f, 1.0f,
 			 1.0f, -1.0f, 0.0f, 1.0f, 0.0f,
 		};
+		glm::vec3 nm(0.0f, 0.0f, 1.0f);
+
 		glGenVertexArrays(1, &quadVAO);
 		glGenBuffers(1, &quadVBO);
 		glBindVertexArray(quadVAO);
@@ -328,16 +337,28 @@ void drawFromAssimpTexture(GLuint program, std::shared_ptr<Model> model, glm::ma
 void drawObject(Object & obj)
 {
 	glUseProgram(obj.shaderID);
-
 	glm::mat4 transformation = perspectiveMatrix * cameraMatrix * obj.modelM;
-
-	glUniformMatrix4fv(glGetUniformLocation(obj.shaderID, "modelMatrix"), 1, GL_FALSE, (float*)&obj.modelM);
 	glUniformMatrix4fv(glGetUniformLocation(obj.shaderID, "transformation"), 1, GL_FALSE, (float*)&transformation);
+	glUniformMatrix4fv(glGetUniformLocation(obj.shaderID, "modelMatrix"), 1, GL_FALSE, (float*)&obj.modelM);
 
+	if (obj.shaderID == programParallax)
+	{
+		glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
+		glUniformMatrix4fv(glGetUniformLocation(obj.shaderID, "projection"), 1, GL_FALSE, (float*)&perspectiveMatrix);
+		glUniformMatrix4fv(glGetUniformLocation(obj.shaderID, "view"), 1, GL_FALSE, (float*)&cameraMatrix);
+		glUniformMatrix4fv(glGetUniformLocation(obj.shaderID, "viewPos"), 1, GL_FALSE, (float*)&cameraPos);
+		glUniformMatrix4fv(glGetUniformLocation(obj.shaderID, "lightPos"), 1, GL_FALSE, (float*)&lights);
+		glUniformMatrix4fv(glGetUniformLocation(obj.shaderID, "heightScale"), 1, GL_FALSE, (float*)&cameraPos[1]);
+		Core::SetActiveTexture(obj.textureID, "diffuseTexture", obj.shaderID, 1);
+		Core::SetActiveTexture(obj.textureNormal, "normalTexture", obj.shaderID, 0);
+		Core::SetActiveTexture(obj.textureSpecular, "depthTexture", obj.shaderID, 2);
+	}
+	else
+	{
 		glUniform3f(glGetUniformLocation(obj.shaderID, "objectColor"), obj.color.r, obj.color.g, obj.color.b);
 		if (obj.textureID != -1)
 			Core::SetActiveTexture(obj.textureID, "diffuseTexture", obj.shaderID, 0);
-
+	}
 	obj.modelParent->Draw(obj.shaderID);
 	glUseProgram(0);
 }
@@ -391,6 +412,7 @@ unsigned int loadCubemap(std::vector<std::string> faces)
 
 	return textureID;
 }
+
 void drawSkybox(GLuint program, std::shared_ptr<Model> cubeModel, GLuint texID)
 {
 	glUseProgram(program);
@@ -895,7 +917,9 @@ void initObjects()
 	planet.invModelM = glm::inverse(earthModelMatrix);
 	planet.modelParent = sphere;
 	planet.textureID = earthTexture;
-	planet.shaderID = programTex;
+	planet.textureNormal = earthNormalTexture;
+	planet.textureSpecular = earthSpecularTexture;
+	planet.shaderID = programParallax;
 	planet.color = glm::vec3(1.0f);
 	objects.push_back(planet);
 
@@ -955,6 +979,7 @@ void init()
 	programBloom = shaderLoader.CreateProgram("shaders/shader_bloom.vert", "shaders/shader_bloom.frag");
 	programParticle = shaderLoader.CreateProgram("shaders/shader_particle.vert", "shaders/shader_particle.frag");
 	programAsteroid = shaderLoader.CreateProgram("shaders/shader_asteroid.vert", "shaders/shader_asteroid.frag");
+	programParallax = shaderLoader.CreateProgram("shaders/shader_parallax.vert", "shaders/shader_parallax.frag");
 
 	glUseProgram(programBlur);
 	glUniform1i(glGetUniformLocation(programBlur, "image"), 0);
@@ -962,9 +987,14 @@ void init()
 	glUniform1i(glGetUniformLocation(programBloom, "scene"), 0);
 	glUniform1i(glGetUniformLocation(programBloom, "bloomBlur"), 1);
 	glUniform2f(glGetUniformLocation(programBloom, "screenSize"), 1.0f / SCR_WIDTH, 1.0f / SCR_HEIGHT);
+	glUseProgram(programParallax);
+	glUniform1i(glGetUniformLocation(programParallax, "diffuseMap"), 0);
+	glUniform1i(glGetUniformLocation(programParallax, "normalMap"), 1);
+	glUniform1i(glGetUniformLocation(programParallax, "depthMap"), 2);
 	glUseProgram(0);
 	
 
+
 	corvette = std::make_shared<Model>("models/Corvette-F3.obj");
 	crewmate = std::make_shared<Model>("models/space_humster.obj");
 	asteroid = std::make_shared<Model>("models/Asteroid_X.obj");
@@ -973,6 +1003,8 @@ void init()
 
 	sunTexture = Core::LoadTexture("textures/sun.png");
 	earthTexture = Core::LoadTexture("textures/earth2.png");
+	earthNormalTexture = Core::LoadTexture("textures/earth2_normal.png");
+	earthSpecularTexture = Core::LoadTexture("textures/earth2_specular.png");
 	moonTexture = Core::LoadTexture("textures/moon.png");
 	particleTexture = Core::LoadTexture("textures/sun.png");
 	marsTexture = Core::LoadTexture("models/textures/Mars/2k_mars.png");
@@ -1022,6 +1054,7 @@ void onReshape(int width, int height)
 	frustumScale = (float)width / (float)height;
 	glViewport(0, 0, width, height);
 }
+
 void idle()
 {
 	glutPostRedisplay();