feat(OpenGL-hello): tex v2

OpenGL/hello/src/main.cpp

@@ -57,31 +57,6 @@ int main() {
   // 创建着色器程序
   Shader shader = Shader("src/tex.vs", "src/tex.fs");
 
-  // 创建纹理
-  unsigned int texture;
-  glGenTextures(1, &texture);
-  glBindTexture(GL_TEXTURE_2D, texture);
-  // 设置纹理环绕方式
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
-  // 设置纹理过滤方式
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
-                  GL_LINEAR_MIPMAP_LINEAR);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-
-  // 加载并生成纹理
-  int width, height, nrChannels;
-  unsigned char *data =
-      stbi_load("resources/container.jpg", &width, &height, &nrChannels, 0);
-  if (data) {
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB,
-                 GL_UNSIGNED_BYTE, data);
-    glGenerateMipmap(GL_TEXTURE_2D);
-  } else {
-    std::cout << "Failed to load texture" << std::endl;
-  }
-  stbi_image_free(data);
-
   unsigned int VAO, VBO, EBO;
   // 创建顶点数组对象
   glGenVertexArrays(1, &VAO);
@@ -110,6 +85,66 @@ int main() {
                         (void *)(6 * sizeof(float)));
   glEnableVertexAttribArray(2);
 
+  // 创建纹理
+  unsigned int texture1, texture2;
+  glGenTextures(1, &texture1);
+  glBindTexture(GL_TEXTURE_2D, texture1);
+  // 设置纹理环绕方式
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+  // 设置纹理过滤方式
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
+                  GL_LINEAR_MIPMAP_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+  // 加载并生成纹理
+  int width, height, nrChannels;
+  // 图片翻转y轴
+  stbi_set_flip_vertically_on_load(true);
+  unsigned char *data =
+      stbi_load("resources/container.jpg", &width, &height, &nrChannels, 0);
+  if (data) {
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB,
+                 GL_UNSIGNED_BYTE, data);
+    glGenerateMipmap(GL_TEXTURE_2D);
+  } else {
+    std::cout << "Failed to load texture" << std::endl;
+  }
+  stbi_image_free(data);
+
+  glGenTextures(1, &texture2);
+  glBindTexture(GL_TEXTURE_2D, texture2);
+  // 设置纹理环绕方式
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+  // 设置纹理过滤方式
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
+                  GL_LINEAR_MIPMAP_LINEAR);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+  // 加载并生成纹理
+  // 图片翻转y轴
+  stbi_set_flip_vertically_on_load(true);
+  data =
+      stbi_load("resources/awesomeface.png", &width, &height, &nrChannels, 0);
+  if (data) {
+
+    // note that the awesomeface.png has transparency and thus an alpha channel,
+    // so make sure to tell OpenGL the data type is of GL_RGBA
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA,
+                 GL_UNSIGNED_BYTE, data);
+    glGenerateMipmap(GL_TEXTURE_2D);
+  } else {
+    std::cout << "Failed to load texture" << std::endl;
+  }
+  stbi_image_free(data);
+
+  // 激活着色器
+  shader.use();
+  // 绑定纹理
+  shader.setInt("texture1", 0);
+  shader.setInt("texture2", 1);
+
   // 循环渲染
   while (!glfwWindowShouldClose(window)) {
     // 处理输入
@@ -120,15 +155,15 @@ int main() {
     glClear(GL_COLOR_BUFFER_BIT);
 
     // 绑定纹理
-    glBindTexture(GL_TEXTURE_2D, texture);
-
-    // 激活着色器
-    shader.use();
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, texture1);
+    glActiveTexture(GL_TEXTURE1);
+    glBindTexture(GL_TEXTURE_2D, texture2);
 
     // 绘制三角形
+    shader.use();
     glBindVertexArray(VAO);
     glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
-    glBindVertexArray(0);
 
     // 检查并调用事件，交换缓冲
     glfwSwapBuffers(window);

OpenGL/hello/src/tex.fs

@@ -4,9 +4,10 @@ out vec4 FragColor;
 in vec3 ourColor;
 in vec2 TexCoord;
 
-uniform sampler2D ourTexture;
+uniform sampler2D texture1;
+uniform sampler2D texture2;
 
 void main()
 {
-    FragColor = texture(ourTexture, TexCoord) * vec4(ourColor, 1.0);;
+    FragColor = mix(texture(texture1, TexCoord), texture(texture2, TexCoord), 0.2);
 }