feat(OpenGL-hello): basic light
This commit is contained in:
iridiumR
parent
1c5b887de1
commit
6ca0e0315c
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@ -9,30 +9,49 @@
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#include <glm/gtc/type_ptr.hpp>
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#include <iostream>
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float vertices[] = {
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-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, 0.5f, -0.5f, -0.5f, 1.0f, 0.0f,
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0.5f, 0.5f, -0.5f, 1.0f, 1.0f, 0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
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-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, -0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
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float vertices[] = {
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-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
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0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
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0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
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0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
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-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
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-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f,
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-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 1.0f, 1.0f, 0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
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-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, -0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
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-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
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0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
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0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
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0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
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-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
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-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f,
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-0.5f, 0.5f, 0.5f, 1.0f, 0.0f, -0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
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-0.5f, -0.5f, -0.5f, 0.0f, 1.0f, -0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
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-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, -0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
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-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f,
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-0.5f, 0.5f, -0.5f, -1.0f, 0.0f, 0.0f,
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-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f,
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-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f,
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-0.5f, -0.5f, 0.5f, -1.0f, 0.0f, 0.0f,
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-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
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0.5f, -0.5f, -0.5f, 0.0f, 1.0f, 0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
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0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f,
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0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f,
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0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f,
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0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f,
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0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f,
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-0.5f, -0.5f, -0.5f, 0.0f, 1.0f, 0.5f, -0.5f, -0.5f, 1.0f, 1.0f,
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0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
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-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, -0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
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-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f,
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0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f,
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0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f,
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0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f,
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-0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f,
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-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f,
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-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
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0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
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-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, -0.5f, 0.5f, -0.5f, 0.0f, 1.0f};
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-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f,
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0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f,
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0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f,
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-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f,
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-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f
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};
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glm::vec3 cubePositions[] = {
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glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(2.0f, 5.0f, -15.0f),
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@ -47,6 +66,7 @@ float lastFrame = 0.0f; // 上一帧的时间
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// settings
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const unsigned int SCR_WIDTH = 800;
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const unsigned int SCR_HEIGHT = 800;
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glm::vec3 lightPos(1.2f, 1.0f, 2.0f);
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// 创建摄像机
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Camera camera = Camera(SCR_HEIGHT / 2.0f, SCR_HEIGHT / 2.0f);
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@ -0,0 +1,25 @@
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#version 330 core
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out vec4 FragColor;
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in vec3 Normal;
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in vec3 FragPos;
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uniform vec3 lightPos;
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uniform vec3 lightColor;
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uniform vec3 objectColor;
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void main()
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{
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// ambient
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float ambientStrength = 0.1;
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vec3 ambient = ambientStrength * lightColor;
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// diffuse
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vec3 norm = normalize(Normal);
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vec3 lightDir = normalize(lightPos - FragPos);
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float diff = max(dot(norm, lightDir), 0.0);
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vec3 diffuse = diff * lightColor;
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vec3 result = (ambient + diffuse) * objectColor;
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FragColor = vec4(result, 1.0);
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}
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@ -0,0 +1,18 @@
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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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out vec3 FragPos;
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out vec3 Normal;
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uniform mat4 model;
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uniform mat4 view;
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uniform mat4 projection;
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void main()
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{
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FragPos = vec3(model * vec4(aPos, 1.0));
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Normal = aNormal;
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gl_Position = projection * view * vec4(FragPos, 1.0);
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}
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@ -0,0 +1,8 @@
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#version 330 core
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out vec4 FragColor;
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uniform vec3 lightColor;
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void main()
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{
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FragColor = vec4(lightColor, 1.0); // set all 4 vector values to 1.0
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}
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@ -0,0 +1,11 @@
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#version 330 core
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layout (location = 0) in vec3 aPos;
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uniform mat4 model;
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uniform mat4 view;
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uniform mat4 projection;
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void main()
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{
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gl_Position = projection * view * model * vec4(aPos, 1.0);
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}
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@ -37,7 +37,8 @@ int main() {
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glfwSetScrollCallback(window, scroll_callback);
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// 创建着色器程序
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Shader shader = Shader("src/tex.vs", "src/tex.fs");
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Shader shader = Shader("src/cube.vs", "src/cube.fs");
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Shader lightShader = Shader("src/light.vs", "src/light.fs");
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unsigned int VAO, VBO, EBO;
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// 创建顶点数组对象
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glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
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// 顶点属性
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void *)0);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void *)0);
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glEnableVertexAttribArray(0);
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// 纹理坐标属性
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glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float),
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// 法向量属性
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float),
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(void *)(3 * sizeof(float)));
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glEnableVertexAttribArray(1);
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// 创建纹理
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unsigned int texture1, texture2;
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glGenTextures(1, &texture1);
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glBindTexture(GL_TEXTURE_2D, texture1);
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// 设置纹理环绕方式
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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// 设置纹理过滤方式
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
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GL_LINEAR_MIPMAP_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// 加载并生成纹理
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int width, height, nrChannels;
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// 图片翻转y轴
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stbi_set_flip_vertically_on_load(true);
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unsigned char *data =
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stbi_load("resources/container.jpg", &width, &height, &nrChannels, 0);
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if (data) {
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB,
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GL_UNSIGNED_BYTE, data);
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glGenerateMipmap(GL_TEXTURE_2D);
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} else {
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std::cout << "Failed to load texture" << std::endl;
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}
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stbi_image_free(data);
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glGenTextures(1, &texture2);
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glBindTexture(GL_TEXTURE_2D, texture2);
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// 设置纹理环绕方式
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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// 设置纹理过滤方式
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
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GL_LINEAR_MIPMAP_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// 加载并生成纹理
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// 图片翻转y轴
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stbi_set_flip_vertically_on_load(true);
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data =
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stbi_load("resources/awesomeface.png", &width, &height, &nrChannels, 0);
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if (data) {
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// note that the awesomeface.png has transparency and thus an alpha channel,
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// so make sure to tell OpenGL the data type is of GL_RGBA
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA,
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GL_UNSIGNED_BYTE, data);
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glGenerateMipmap(GL_TEXTURE_2D);
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} else {
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std::cout << "Failed to load texture" << std::endl;
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}
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stbi_image_free(data);
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// 设置光源
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unsigned int lightVAO;
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glGenVertexArrays(1, &lightVAO);
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glBindVertexArray(lightVAO);
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// 只需要绑定VBO不用再次设置VBO的数据，因为箱子的VBO数据中已经包含了正确的立方体顶点数据
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glBindBuffer(GL_ARRAY_BUFFER, VBO);
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// 设置灯立方体的顶点属性（对我们的灯来说仅仅只有位置数据）
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void *)0);
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glEnableVertexAttribArray(0);
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// 激活着色器
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shader.use();
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// 绑定纹理
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shader.setInt("texture1", 0);
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shader.setInt("texture2", 1);
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shader.setVec3("lightColor", 1.0f, 1.0f, 1.0f);
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shader.setVec3("objectColor", 1.0f, 0.5f, 0.31f);
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// create transformations
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glm::mat4 view =
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glm::lookAt(glm::vec3(0.0f, 0.0f, 3.0f), glm::vec3(0.0f, 0.0f, 0.0f),
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glm::vec3(0.0f, 1.0f, 0.0f));
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glm::mat4 projection = glm::mat4(1.0f);
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view = glm::translate(view, glm::vec3(0.0f, 0.0f, -3.0f));
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lightShader.use();
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lightShader.setVec3("lightColor", 1.0f, 1.0f, 1.0f);
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lightShader.setVec3("lightPos", lightPos);
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// 开启深度测试
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glEnable(GL_DEPTH_TEST);
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@ -140,18 +96,20 @@ int main() {
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processInput(window);
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// 设置为白色
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glClearColor(1.0f, 1.0f, 1.0f, 0.0f);
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glClearColor(0.1f, 0.1f, 0.1f, 0.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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// 绑定纹理
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, texture1);
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glActiveTexture(GL_TEXTURE1);
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glBindTexture(GL_TEXTURE_2D, texture2);
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glm::mat4 view = camera.GetViewMatrix();
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glm::mat4 projection =
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glm::perspective(glm::radians(camera.Zoom),
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(float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
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// 绘制三角形
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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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// 设置变换矩阵
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glm::mat4 trans(1.0f);
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trans = glm::rotate(trans, (float)glfwGetTime(), glm::vec3(0.0, 0.25, 0.0));
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@ -169,13 +127,18 @@ int main() {
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glDrawArrays(GL_TRIANGLES, 0, 36);
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}
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float radius = 10.0f;
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view = camera.GetViewMatrix();
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shader.setMat4("view", view);
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lightShader.use();
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glm::mat4 model = glm::mat4(1.0f);
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model = glm::translate(model, lightPos);
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model = glm::scale(model, glm::vec3(0.2f)); // a smaller cube
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glBindVertexArray(lightVAO);
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lightShader.setMat4("projection", projection);
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lightShader.setMat4("view", view);
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lightShader.setMat4("model", model);
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glDrawArrays(GL_TRIANGLES, 0, 36);
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projection = glm::perspective(
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glm::radians(camera.Zoom), (float)SCR_WIDTH / (float)SCR_HEIGHT, 0.1f, 100.0f);
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shader.setMat4("projection", projection);
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// 检查并调用事件，交换缓冲
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glfwSwapBuffers(window);
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glfwPollEvents();
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@ -1,12 +0,0 @@
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#version 330 core
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out vec4 FragColor;
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in vec2 TexCoord;
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uniform sampler2D texture1;
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uniform sampler2D texture2;
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void main()
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{
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FragColor = mix(texture(texture1, TexCoord), texture(texture2, TexCoord), 0.2);
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}
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@ -1,16 +0,0 @@
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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 vec2 aTexCoord;
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out vec2 TexCoord;
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uniform mat4 model;
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uniform mat4 view;
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uniform mat4 projection;
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uniform mat4 trans;
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void main() {
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gl_Position = projection * view * model * trans * vec4(aPos, 1.0);
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// gl_Position = trans * vec4(aPos, 1.0);
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TexCoord = aTexCoord;
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}
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Reference in New Issue