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opengl_opencv_example
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Displaying chart. Can optionally set resolution. Bird is stretched, though

This commit is contained in:
Matt McWilliams 2024-04-01 21:17:57 -04:00
parent f982e4721d
commit 1de574af6d
1 changed files with 19 additions and 7 deletions
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26
main.cpp
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@ -20,7 +20,6 @@ using namespace std;
using namespace std::chrono; using namespace std::chrono;
using time_stamp = time_point<system_clock, microseconds>; using time_stamp = time_point<system_clock, microseconds>;
Mat image;
GLuint imageTexture; GLuint imageTexture;
GLint screenWidth = 0; GLint screenWidth = 0;
GLint screenHeight = 0; GLint screenHeight = 0;
@ -29,25 +28,27 @@ time_stamp ts;
void loadTexture (GLuint& imageTexture1) void loadTexture (GLuint& imageTexture1)
{ {
string image_path = samples::findFile("chart.png"); string image_path = samples::findFile("chart.png");
Mat image = imread(image_path, IMREAD_COLOR); Mat loaded = imread(image_path, IMREAD_COLOR);
Mat image = Mat::zeros(screenWidth, screenHeight, CV_8UC3);
cout << "created image" << endl;
if (image.empty()) { if (image.empty()) {
cout << "image empty" << endl; cout << "image empty" << endl;
} else { } else {
cout << "loaded " << image_path << endl; cout << "loaded " << image_path << endl;
flip(image, image, 0); cout << " dim " << loaded.cols << "x" << loaded.rows << endl;
loaded.copyTo(image(Rect(0, 0, loaded.cols, loaded.rows)));
//flip(image, image, 0);
#if (CV_VERSION_MAJOR >= 4) #if (CV_VERSION_MAJOR >= 4)
cvtColor(image, image, cv::COLOR_BGR2RGB); cvtColor(image, image, cv::COLOR_BGR2RGB);
#else #else
cvtColor(image, image, CV_BGR2RGB); cvtColor(image, image, CV_BGR2RGB);
#endif #endif
//glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glGenTextures(1, &imageTexture1); glGenTextures(1, &imageTexture1);
glBindTexture(GL_TEXTURE_2D, imageTexture1); glBindTexture(GL_TEXTURE_2D, imageTexture1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); 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_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
@ -60,6 +61,7 @@ void loadTexture (GLuint& imageTexture1)
GL_RGB, // Input image format (i.e. GL_RGB, GL_RGBA, GL_BGR etc.) GL_RGB, // Input image format (i.e. GL_RGB, GL_RGBA, GL_BGR etc.)
GL_UNSIGNED_BYTE, // Image data type GL_UNSIGNED_BYTE, // Image data type
image.ptr()); // The actual image data itself image.ptr()); // The actual image data itself
cout << "display()" << endl;
} }
} }
@ -71,18 +73,18 @@ void getScreenDimensions ()
screenWidth = dims[2]; screenWidth = dims[2];
screenHeight = dims[3]; screenHeight = dims[3];
cout << screenWidth << "," << screenHeight << endl; cout << screenWidth << "," << screenHeight << endl;
loadTexture(imageTexture);
} }
} }
void display(void) void display(void)
{ {
getScreenDimensions(); getScreenDimensions();
loadTexture(imageTexture);
ts = time_point_cast<microseconds>(system_clock::now()); ts = time_point_cast<microseconds>(system_clock::now());
glClear(GL_COLOR_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_TEXTURE_2D); glEnable(GL_TEXTURE_2D);
//glViewport(0, 0, screenWidth, screenHeight); glViewport(0, 0, screenWidth, screenHeight);
glMatrixMode(GL_PROJECTION); glMatrixMode(GL_PROJECTION);
glLoadIdentity(); glLoadIdentity();
@ -102,6 +104,16 @@ void display(void)
int main(int argc, char** argv) int main(int argc, char** argv)
{ {
if (argc > 1)
{
screenWidth = atoi(argv[1]);
cout << "Set width: " << screenWidth << endl;
}
if (argc > 2)
{
screenHeight = atoi(argv[2]);
cout << "Set height: " << screenHeight << endl;
}
glutInit(&argc, argv); glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE); glutInitDisplayMode(GLUT_SINGLE);
glutCreateWindow("opengl_opencv_example"); glutCreateWindow("opengl_opencv_example");