mirror of
https://github.com/JoeyDeVries/LearnOpenGL.git
synced 2026-01-30 20:13:22 +08:00
Code re-work: parallax mapping.
This commit is contained in:
Joey de Vries
@@ -0,0 +1,78 @@
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#version 330 core
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out vec4 FragColor;
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in VS_OUT {
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vec3 FragPos;
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vec2 TexCoords;
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vec3 TangentLightPos;
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vec3 TangentViewPos;
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vec3 TangentFragPos;
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} fs_in;
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uniform sampler2D diffuseMap;
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uniform sampler2D normalMap;
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uniform sampler2D depthMap;
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uniform float heightScale;
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vec2 ParallaxMapping(vec2 texCoords, vec3 viewDir)
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{
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// number of depth layers
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const float minLayers = 8;
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const float maxLayers = 32;
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float numLayers = mix(maxLayers, minLayers, abs(dot(vec3(0.0, 0.0, 1.0), viewDir)));
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// calculate the size of each layer
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float layerDepth = 1.0 / numLayers;
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// depth of current layer
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float currentLayerDepth = 0.0;
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// the amount to shift the texture coordinates per layer (from vector P)
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vec2 P = viewDir.xy / viewDir.z * heightScale;
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vec2 deltaTexCoords = P / numLayers;
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// get initial values
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vec2 currentTexCoords = texCoords;
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float currentDepthMapValue = texture(depthMap, currentTexCoords).r;
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while(currentLayerDepth < currentDepthMapValue)
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{
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// shift texture coordinates along direction of P
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currentTexCoords -= deltaTexCoords;
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// get depthmap value at current texture coordinates
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currentDepthMapValue = texture(depthMap, currentTexCoords).r;
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// get depth of next layer
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currentLayerDepth += layerDepth;
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}
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return currentTexCoords;
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}
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void main()
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{
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// offset texture coordinates with Parallax Mapping
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vec3 viewDir = normalize(fs_in.TangentViewPos - fs_in.TangentFragPos);
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vec2 texCoords = fs_in.TexCoords;
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texCoords = ParallaxMapping(fs_in.TexCoords, viewDir);
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if(texCoords.x > 1.0 || texCoords.y > 1.0 || texCoords.x < 0.0 || texCoords.y < 0.0)
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discard;
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// obtain normal from normal map
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vec3 normal = texture(normalMap, texCoords).rgb;
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normal = normalize(normal * 2.0 - 1.0);
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// get diffuse color
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vec3 color = texture(diffuseMap, texCoords).rgb;
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// ambient
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vec3 ambient = 0.1 * color;
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// diffuse
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vec3 lightDir = normalize(fs_in.TangentLightPos - fs_in.TangentFragPos);
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float diff = max(dot(lightDir, normal), 0.0);
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vec3 diffuse = diff * color;
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// specular
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vec3 reflectDir = reflect(-lightDir, normal);
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vec3 halfwayDir = normalize(lightDir + viewDir);
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float spec = pow(max(dot(normal, halfwayDir), 0.0), 32.0);
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vec3 specular = vec3(0.2) * spec;
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FragColor = vec4(ambient + diffuse + specular, 1.0);
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}
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@@ -0,0 +1,38 @@
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#version 330 core
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layout (location = 0) in vec3 aPos;
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layout (location = 1) in vec3 aNormal;
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layout (location = 2) in vec2 aTexCoords;
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layout (location = 3) in vec3 aTangent;
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layout (location = 4) in vec3 aBitangent;
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out VS_OUT {
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vec3 FragPos;
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vec2 TexCoords;
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vec3 TangentLightPos;
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vec3 TangentViewPos;
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vec3 TangentFragPos;
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} vs_out;
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uniform mat4 projection;
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uniform mat4 view;
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uniform mat4 model;
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uniform vec3 lightPos;
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uniform vec3 viewPos;
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void main()
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{
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vs_out.FragPos = vec3(model * vec4(aPos, 1.0));
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vs_out.TexCoords = aTexCoords;
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vec3 T = normalize(mat3(model) * aTangent);
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vec3 B = normalize(mat3(model) * aBitangent);
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vec3 N = normalize(mat3(model) * aNormal);
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mat3 TBN = transpose(mat3(T, B, N));
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vs_out.TangentLightPos = TBN * lightPos;
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vs_out.TangentViewPos = TBN * viewPos;
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vs_out.TangentFragPos = TBN * vs_out.FragPos;
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gl_Position = projection * view * model * vec4(aPos, 1.0);
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}
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@@ -0,0 +1,360 @@
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#include <glad/glad.h>
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#include <GLFW/glfw3.h>
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#include <stb_image.h>
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#include <glm/glm.hpp>
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#include <glm/gtc/matrix_transform.hpp>
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#include <glm/gtc/type_ptr.hpp>
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#include <learnopengl/filesystem.h>
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#include <learnopengl/shader.h>
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#include <learnopengl/camera.h>
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#include <learnopengl/model.h>
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#include <iostream>
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void framebuffer_size_callback(GLFWwindow* window, int width, int height);
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void mouse_callback(GLFWwindow* window, double xpos, double ypos);
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void scroll_callback(GLFWwindow* window, double xoffset, double yoffset);
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void processInput(GLFWwindow *window);
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unsigned int loadTexture(const char *path);
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void renderQuad();
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// settings
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const unsigned int SCR_WIDTH = 1280;
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const unsigned int SCR_HEIGHT = 720;
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float heightScale = 0.1;
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// camera
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Camera camera(glm::vec3(0.0f, 0.0f, 3.0f));
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float lastX = (float)SCR_WIDTH / 2.0;
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float lastY = (float)SCR_HEIGHT / 2.0;
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bool firstMouse = true;
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// timing
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float deltaTime = 0.0f;
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float lastFrame = 0.0f;
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int main()
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{
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// glfw: initialize and configure
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// ------------------------------
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glfwInit();
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
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glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
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// glfw window creation
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// --------------------
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GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "LearnOpenGL", NULL, NULL);
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glfwMakeContextCurrent(window);
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if (window == NULL)
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{
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std::cout << "Failed to create GLFW window" << std::endl;
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glfwTerminate();
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return -1;
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}
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glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
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glfwSetCursorPosCallback(window, mouse_callback);
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glfwSetScrollCallback(window, scroll_callback);
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// tell GLFW to capture our mouse
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glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
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// glad: load all OpenGL function pointers
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// ---------------------------------------
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if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
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{
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std::cout << "Failed to initialize GLAD" << std::endl;
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return -1;
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}
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// configure global opengl state
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// -----------------------------
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glEnable(GL_DEPTH_TEST);
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// build and compile shaders
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// -------------------------
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Shader shader("5.2.parallax_mapping.vs", "5.2.parallax_mapping.fs");
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// load textures
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// -------------
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unsigned int diffuseMap = loadTexture(FileSystem::getPath("resources/textures/bricks2.jpg").c_str());
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unsigned int normalMap = loadTexture(FileSystem::getPath("resources/textures/bricks2_normal.jpg").c_str());
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unsigned int heightMap = loadTexture(FileSystem::getPath("resources/textures/bricks2_disp.jpg").c_str());
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/* unsigned int diffuseMap = loadTexture(FileSystem::getPath("resources/textures/toy_box_diffuse.png").c_str());
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unsigned int normalMap = loadTexture(FileSystem::getPath("resources/textures/toy_box_normal.png").c_str());
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unsigned int heightMap = loadTexture(FileSystem::getPath("resources/textures/toy_box_disp.png").c_str());*/
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// shader configuration
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// --------------------
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shader.use();
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shader.setInt("diffuseMap", 0);
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shader.setInt("normalMap", 1);
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shader.setInt("depthMap", 2);
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// lighting info
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// -------------
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glm::vec3 lightPos(0.5f, 1.0f, 0.3f);
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// render loop
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// -----------
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while (!glfwWindowShouldClose(window))
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{
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// per-frame time logic
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// --------------------
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float currentFrame = glfwGetTime();
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deltaTime = currentFrame - lastFrame;
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lastFrame = currentFrame;
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// input
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// -----
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processInput(window);
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// render
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// ------
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glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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// configure view/projection matrices
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glm::mat4 projection = glm::perspective(camera.Zoom, (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
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glm::mat4 view = camera.GetViewMatrix();
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shader.use();
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shader.setMat4("projection", projection);
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shader.setMat4("view", view);
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// render parallax-mapped quad
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glm::mat4 model;
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model = glm::rotate(model, glm::radians((float)glfwGetTime() * -10.0f), glm::normalize(glm::vec3(1.0, 0.0, 1.0))); // rotate the quad to show parallax mapping from multiple directions
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shader.setMat4("model", model);
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shader.setVec3("viewPos", camera.Position);
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shader.setVec3("lightPos", lightPos);
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shader.setFloat("heightScale", heightScale); // adjust with Q and E keys
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std::cout << heightScale << std::endl;
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, diffuseMap);
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glActiveTexture(GL_TEXTURE1);
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glBindTexture(GL_TEXTURE_2D, normalMap);
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glActiveTexture(GL_TEXTURE2);
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glBindTexture(GL_TEXTURE_2D, heightMap);
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renderQuad();
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// render light source (simply re-renders a smaller plane at the light's position for debugging/visualization)
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model = glm::mat4();
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model = glm::translate(model, lightPos);
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model = glm::scale(model, glm::vec3(0.1f));
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shader.setMat4("model", model);
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renderQuad();
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// glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
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// -------------------------------------------------------------------------------
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glfwSwapBuffers(window);
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glfwPollEvents();
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}
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glfwTerminate();
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return 0;
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}
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// renderQuad() renders a 1x1 quad in NDC
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unsigned int quadVAO = 0;
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unsigned int quadVBO;
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void renderQuad()
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{
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if (quadVAO == 0)
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{
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// positions
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glm::vec3 pos1(-1.0f, 1.0f, 0.0f);
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glm::vec3 pos2(-1.0f, -1.0f, 0.0f);
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glm::vec3 pos3( 1.0f, -1.0f, 0.0f);
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glm::vec3 pos4( 1.0f, 1.0f, 0.0f);
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// texture coordinates
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glm::vec2 uv1(0.0f, 1.0f);
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glm::vec2 uv2(0.0f, 0.0f);
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glm::vec2 uv3(1.0f, 0.0f);
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glm::vec2 uv4(1.0f, 1.0f);
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// normal vector
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glm::vec3 nm(0.0f, 0.0f, 1.0f);
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// calculate tangent/bitangent vectors of both triangles
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glm::vec3 tangent1, bitangent1;
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glm::vec3 tangent2, bitangent2;
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// triangle 1
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// ----------
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glm::vec3 edge1 = pos2 - pos1;
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glm::vec3 edge2 = pos3 - pos1;
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glm::vec2 deltaUV1 = uv2 - uv1;
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glm::vec2 deltaUV2 = uv3 - uv1;
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GLfloat f = 1.0f / (deltaUV1.x * deltaUV2.y - deltaUV2.x * deltaUV1.y);
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tangent1.x = f * (deltaUV2.y * edge1.x - deltaUV1.y * edge2.x);
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tangent1.y = f * (deltaUV2.y * edge1.y - deltaUV1.y * edge2.y);
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tangent1.z = f * (deltaUV2.y * edge1.z - deltaUV1.y * edge2.z);
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tangent1 = glm::normalize(tangent1);
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bitangent1.x = f * (-deltaUV2.x * edge1.x + deltaUV1.x * edge2.x);
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bitangent1.y = f * (-deltaUV2.x * edge1.y + deltaUV1.x * edge2.y);
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bitangent1.z = f * (-deltaUV2.x * edge1.z + deltaUV1.x * edge2.z);
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bitangent1 = glm::normalize(bitangent1);
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// triangle 2
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// ----------
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edge1 = pos3 - pos1;
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edge2 = pos4 - pos1;
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deltaUV1 = uv3 - uv1;
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deltaUV2 = uv4 - uv1;
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f = 1.0f / (deltaUV1.x * deltaUV2.y - deltaUV2.x * deltaUV1.y);
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tangent2.x = f * (deltaUV2.y * edge1.x - deltaUV1.y * edge2.x);
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tangent2.y = f * (deltaUV2.y * edge1.y - deltaUV1.y * edge2.y);
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tangent2.z = f * (deltaUV2.y * edge1.z - deltaUV1.y * edge2.z);
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tangent2 = glm::normalize(tangent2);
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bitangent2.x = f * (-deltaUV2.x * edge1.x + deltaUV1.x * edge2.x);
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bitangent2.y = f * (-deltaUV2.x * edge1.y + deltaUV1.x * edge2.y);
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bitangent2.z = f * (-deltaUV2.x * edge1.z + deltaUV1.x * edge2.z);
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bitangent2 = glm::normalize(bitangent2);
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float quadVertices[] = {
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// positions // normal // texcoords // tangent // bitangent
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pos1.x, pos1.y, pos1.z, nm.x, nm.y, nm.z, uv1.x, uv1.y, tangent1.x, tangent1.y, tangent1.z, bitangent1.x, bitangent1.y, bitangent1.z,
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pos2.x, pos2.y, pos2.z, nm.x, nm.y, nm.z, uv2.x, uv2.y, tangent1.x, tangent1.y, tangent1.z, bitangent1.x, bitangent1.y, bitangent1.z,
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pos3.x, pos3.y, pos3.z, nm.x, nm.y, nm.z, uv3.x, uv3.y, tangent1.x, tangent1.y, tangent1.z, bitangent1.x, bitangent1.y, bitangent1.z,
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pos1.x, pos1.y, pos1.z, nm.x, nm.y, nm.z, uv1.x, uv1.y, tangent2.x, tangent2.y, tangent2.z, bitangent2.x, bitangent2.y, bitangent2.z,
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pos3.x, pos3.y, pos3.z, nm.x, nm.y, nm.z, uv3.x, uv3.y, tangent2.x, tangent2.y, tangent2.z, bitangent2.x, bitangent2.y, bitangent2.z,
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pos4.x, pos4.y, pos4.z, nm.x, nm.y, nm.z, uv4.x, uv4.y, tangent2.x, tangent2.y, tangent2.z, bitangent2.x, bitangent2.y, bitangent2.z
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};
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// configure plane VAO
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glGenVertexArrays(1, &quadVAO);
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glGenBuffers(1, &quadVBO);
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glBindVertexArray(quadVAO);
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glBindBuffer(GL_ARRAY_BUFFER, quadVBO);
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glBufferData(GL_ARRAY_BUFFER, sizeof(quadVertices), &quadVertices, GL_STATIC_DRAW);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 14 * sizeof(float), (void*)0);
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glEnableVertexAttribArray(1);
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 14 * sizeof(float), (void*)(3 * sizeof(float)));
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glEnableVertexAttribArray(2);
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glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 14 * sizeof(float), (void*)(6 * sizeof(float)));
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glEnableVertexAttribArray(3);
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glVertexAttribPointer(3, 3, GL_FLOAT, GL_FALSE, 14 * sizeof(float), (void*)(8 * sizeof(float)));
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glEnableVertexAttribArray(4);
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glVertexAttribPointer(4, 3, GL_FLOAT, GL_FALSE, 14 * sizeof(float), (void*)(11 * sizeof(float)));
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}
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glBindVertexArray(quadVAO);
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glDrawArrays(GL_TRIANGLES, 0, 6);
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glBindVertexArray(0);
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}
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// process all input: query GLFW whether relevant keys are pressed/released this frame and react accordingly
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// ---------------------------------------------------------------------------------------------------------
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void processInput(GLFWwindow *window)
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{
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if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
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glfwSetWindowShouldClose(window, true);
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float cameraSpeed = 2.5 * deltaTime;
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if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
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camera.ProcessKeyboard(FORWARD, deltaTime);
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if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
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camera.ProcessKeyboard(BACKWARD, deltaTime);
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if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
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camera.ProcessKeyboard(LEFT, deltaTime);
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if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
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camera.ProcessKeyboard(RIGHT, deltaTime);
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if (glfwGetKey(window, GLFW_KEY_Q) == GLFW_PRESS)
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{
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if (heightScale > 0.0f)
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heightScale -= 0.0005f;
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else
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heightScale = 0.0f;
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}
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else if (glfwGetKey(window, GLFW_KEY_E) == GLFW_PRESS)
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{
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if (heightScale < 1.0f)
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heightScale += 0.0005f;
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else
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heightScale = 1.0f;
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}
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}
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// glfw: whenever the window size changed (by OS or user resize) this callback function executes
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// ---------------------------------------------------------------------------------------------
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void framebuffer_size_callback(GLFWwindow* window, int width, int height)
|
||||
{
|
||||
// make sure the viewport matches the new window dimensions; note that width and
|
||||
// height will be significantly larger than specified on retina displays.
|
||||
glViewport(0, 0, width, height);
|
||||
}
|
||||
|
||||
|
||||
// glfw: whenever the mouse moves, this callback is called
|
||||
// -------------------------------------------------------
|
||||
void mouse_callback(GLFWwindow* window, double xpos, double ypos)
|
||||
{
|
||||
if (firstMouse)
|
||||
{
|
||||
lastX = xpos;
|
||||
lastY = ypos;
|
||||
firstMouse = false;
|
||||
}
|
||||
|
||||
float xoffset = xpos - lastX;
|
||||
float yoffset = lastY - ypos; // reversed since y-coordinates go from bottom to top
|
||||
|
||||
lastX = xpos;
|
||||
lastY = ypos;
|
||||
|
||||
camera.ProcessMouseMovement(xoffset, yoffset);
|
||||
}
|
||||
|
||||
// glfw: whenever the mouse scroll wheel scrolls, this callback is called
|
||||
// ----------------------------------------------------------------------
|
||||
void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
|
||||
{
|
||||
camera.ProcessMouseScroll(yoffset);
|
||||
}
|
||||
|
||||
// utility function for loading a 2D texture from file
|
||||
// ---------------------------------------------------
|
||||
unsigned int loadTexture(char const * path)
|
||||
{
|
||||
unsigned int textureID;
|
||||
glGenTextures(1, &textureID);
|
||||
|
||||
int width, height, nrComponents;
|
||||
unsigned char *data = stbi_load(path, &width, &height, &nrComponents, 0);
|
||||
if (data)
|
||||
{
|
||||
GLenum format;
|
||||
if (nrComponents == 1)
|
||||
format = GL_RED;
|
||||
else if (nrComponents == 3)
|
||||
format = GL_RGB;
|
||||
else if (nrComponents == 4)
|
||||
format = GL_RGBA;
|
||||
|
||||
glBindTexture(GL_TEXTURE_2D, textureID);
|
||||
glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, data);
|
||||
glGenerateMipmap(GL_TEXTURE_2D);
|
||||
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
|
||||
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
||||
|
||||
stbi_image_free(data);
|
||||
}
|
||||
else
|
||||
{
|
||||
std::cout << "Texture failed to load at path: " << path << std::endl;
|
||||
stbi_image_free(data);
|
||||
}
|
||||
|
||||
return textureID;
|
||||
}
|
||||
Reference in New Issue
Block a user