examples
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opengl_opencv_example
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Display quad, full screen

This commit is contained in:
mmcwilliams 2024-04-01 11:00:11 -04:00
parent 32bf572d00
commit 801a56a78f
1 changed files with 13 additions and 31 deletions
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36
main.cpp
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@ -23,18 +23,16 @@ GLuint imageTexture;
void displayMe(void)
{
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
// Set every pixel in the frame buffer to the current clear color.
glClear(GL_COLOR_BUFFER_BIT);
glTexImage2D( GL_TEXTURE_2D, // Type of texture
0, // Pyramid level (for mip-mapping) - 0 is the top level
GL_RGB, // Internal colour format to convert to
image.cols, // Image width i.e. 640 for Kinect in standard mode
image.rows, // Image height i.e. 480 for Kinect in standard mode
0, // Border width in pixels (can either be 1 or 0)
GL_RGB, // Input image format (i.e. GL_RGB, GL_RGBA, GL_BGR etc.)
GL_UNSIGNED_BYTE, // Image data type
image.ptr()); // The actual image data itself
glBegin(GL_POLYGON);
glColor3f(1, 0, 0); glVertex3f(-1.0, -1.0, 0.5);
glColor3f(0, 1, 0); glVertex3f(1.0, -1.0, 0);
glColor3f(0, 0, 1); glVertex3f(1.0, 1.0, 0);
glVertex3f(-1.0, 1.0, 0);
glEnd();
// Flush drawing command buffer to make drawing happen as soon as possible.
glFlush();
}
@ -43,33 +41,17 @@ int main(int argc, char** argv)
string image_path = samples::findFile("chart.png");
Mat image = imread(image_path, IMREAD_COLOR);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glGenTextures(1, &imageTexture);
glBindTexture(GL_TEXTURE_2D, imageTexture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// Set texture clamping method
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
#if (CV_VERSION_MAJOR >= 4)
cvtColor(image, image, cv::COLOR_BGR2RGB);
#else
cvtColor(image, image, CV_BGR2RGB);
#endif
//GLint dims[4] = {0};
//glGetIntegerv(GL_VIEWPORT, dims);
//GLint fbWidth = dims[2];
//GLint fbHeight = dims[3];
//cout << fbWidth << "," << fbHeight << endl;
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE);
glutInitWindowSize(1920, 1080);
glutInitWindowPosition(0, 0);
glutCreateWindow("Hello world!");
glutCreateWindow("opengl_opencv_example");
glutFullScreen();
glutDisplayFunc(displayMe);