以下是一个使用OpenCV读取图片,然后使用GLFW加载到纹理渲染并缩放1/2后显示的例子:
#include <iostream>
#include <opencv2/opencv.hpp>
#include <GLFW/glfw3.h>
// GLFW窗口大小
const int WINDOW_WIDTH = 800;
const int WINDOW_HEIGHT = 600;
void errorCallback(int error, const char* description) {
std::cout << "GLFW Error: " << description << std::endl;
}
int main() {
// 初始化GLFW
glfwSetErrorCallback(errorCallback);
if (!glfwInit()) {
std::cout << "Failed to initialize GLFW" << std::endl;
return -1;
}
// 创建窗口
GLFWwindow* window = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "Image Texture", nullptr, nullptr);
if (!window) {
std::cout << "Failed to create GLFW window" << std::endl;
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
// 初始化OpenGL
glViewport(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
// 加载图片并创建纹理
cv::Mat image = cv::imread("image.jpg"); // 替换成你要读取的图片路径和名称
if (image.empty()) {
std::cout << "Failed to load image" << std::endl;
glfwTerminate();
return -1;
}
cv::resize(image, image, cv::Size(image.cols / 2, image.rows / 2)); // 缩放图像
GLuint textureID;
glGenTextures(1, &textureID);
glBindTexture(GL_TEXTURE_2D, textureID);
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);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D,
0,
GL_RGB,
image.cols,
image.rows,
0,
GL_BGR_EXT,
GL_UNSIGNED_BYTE,
image.ptr());
// 渲染循环
while (!glfwWindowShouldClose(window)) {
// 清空缓冲区
glClear(GL_COLOR_BUFFER_BIT);
// 绘制纹理
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, textureID);
glBegin(GL_QUADS);
{
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, -1.0f, 0.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f(1.0f, -1.0f, 0.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(1.0f, 1.0f, 0.0f);
glTexCoord2f(0.0f, 0.0); glVertex3d(-1.5,-1.,-10.);
}
glEnd();
// 刷新窗口
glfwSwapBuffers(window);
// 检查并处理事件
glfwPollEvents();
}
// 清理资源
glDeleteTextures(1, &textureID);
glfwTerminate();
return 0;
}
请确保在编译时链接了OpenCV和GLFW库,并将代码中的图片路径替换为你要加载的图片路径。
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