mirror of https://github.com/opencv/opencv.git
Merge pull request #25822 from mqcmd196:gtk3-gl-support
Support OpenGL GTK3 New API #25822 Fixes #20001 GSoC2024 Project ### Pull Request Readiness Checklist See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch - [x] There is a reference to the original bug report and related work - [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable Patch to opencv_extra has the same branch name. - [ ] The feature is well documented and sample code can be built with the project CMakepull/25905/head
Yoshiki Obinata
4 months ago
committed by
GitHub
parent
e90935e81c
commit
4842043c6a
8 changed files with 301 additions and 28 deletions
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#include <iostream> |
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#include <epoxy/gl.h> |
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#ifdef _WIN32 |
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#define WIN32_LEAN_AND_MEAN 1 |
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#define NOMINMAX 1 |
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#include <windows.h> |
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#endif |
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#if defined(__APPLE__) |
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#include <OpenGL/gl.h> |
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#include <OpenGL/glu.h> |
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#else |
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#include <GL/gl.h> |
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#include <GL/glu.h> |
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#endif |
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#include "opencv2/core.hpp" |
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#include "opencv2/core/opengl.hpp" |
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#include "opencv2/core/cuda.hpp" |
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#include "opencv2/highgui.hpp" |
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using namespace std; |
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using namespace cv; |
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using namespace cv::cuda; |
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const int win_width = 800; |
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const int win_height = 640; |
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struct DrawData |
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{ |
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GLuint vao, vbo, program, textureID; |
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}; |
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static cv::Mat rot(float angle) |
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{ |
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cv::Mat R_y = (cv::Mat_<float>(4,4) << |
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cos(angle), 0, sin(angle), 0, |
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0, 1, 0, 0, |
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-sin(angle), 0, cos(angle), 0, |
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0, 0, 0, 1); |
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return R_y; |
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} |
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static GLuint create_shader(const char* source, GLenum type) { |
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GLuint shader = glCreateShader(type); |
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glShaderSource(shader, 1, &source, NULL); |
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glCompileShader(shader); |
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return shader; |
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} |
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static void draw(void* userdata) { |
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DrawData* data = static_cast<DrawData*>(userdata); |
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static float angle = 0.0f; |
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angle += 1.f; |
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cv::Mat trans = rot(CV_PI * angle / 360.f); |
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glClearColor(0.0, 0.0, 0.0, 1.0); |
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
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glUseProgram(data->program); |
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glUniformMatrix4fv(glGetUniformLocation(data->program, "transform"), 1, GL_FALSE, trans.ptr<float>()); |
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glBindTexture(GL_TEXTURE_2D, data->textureID); |
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glBindVertexArray(data->vao); |
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); |
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glBindVertexArray(0); |
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} |
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int main(int argc, char* argv[]) |
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{ |
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string filename; |
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if (argc < 2) |
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{ |
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cout << "Usage: " << argv[0] << " image" << endl; |
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filename = "baboon.jpg"; |
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} |
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else |
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filename = argv[1]; |
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Mat img = imread(samples::findFile(filename)); |
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if (img.empty()) |
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{ |
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cerr << "Can't open image " << filename << endl; |
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return -1; |
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} |
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flip(img, img, 0); |
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namedWindow("OpenGL", WINDOW_OPENGL); |
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resizeWindow("OpenGL", win_width, win_height); |
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DrawData data; |
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glEnable(GL_DEPTH_TEST); |
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const char *vertex_shader_source = |
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"#version 330 core\n" |
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"layout (location = 0) in vec3 position;\n" |
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"layout (location = 1) in vec2 texCoord;\n" |
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"out vec2 TexCoord;\n" |
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"uniform mat4 transform;\n" |
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"void main() {\n" |
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" gl_Position = transform * vec4(position, 1.0);\n" |
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" TexCoord = texCoord;\n" |
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"}\n"; |
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const char *fragment_shader_source = |
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"#version 330 core\n" |
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"in vec2 TexCoord;\n" |
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"out vec4 color;\n" |
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"uniform sampler2D ourTexture;\n" |
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"void main() {\n" |
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" color = texture(ourTexture, TexCoord);\n" |
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"}\n"; |
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data.program = glCreateProgram(); |
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GLuint vertex_shader = create_shader(vertex_shader_source, GL_VERTEX_SHADER); |
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GLuint fragment_shader = create_shader(fragment_shader_source, GL_FRAGMENT_SHADER); |
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glAttachShader(data.program, vertex_shader); |
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glAttachShader(data.program, fragment_shader); |
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glLinkProgram(data.program); |
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glUseProgram(data.program); |
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GLfloat vertices[] = { |
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// Positions // Texture Coords
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1.0f, 1.0f, 0.0f, 1.0f, 1.0f, // Top Right
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1.0f, -1.0f, 0.0f, 1.0f, 0.0f, // Bottom Right
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-1.0f, 1.0f, 0.0f, 0.0f, 1.0f, // Top Left
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-1.0f, -1.0f, 0.0f, 0.0f, 0.0f // Bottom Left
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}; |
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glGenVertexArrays(1, &data.vao); |
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glGenBuffers(1, &data.vbo); |
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glBindVertexArray(data.vao); |
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glBindBuffer(GL_ARRAY_BUFFER, data.vbo); |
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glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW); |
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// Position attribute
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)0); |
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glEnableVertexAttribArray(0); |
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// Texture Coord attribute
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glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(GLfloat), (GLvoid*)(3 * sizeof(GLfloat))); |
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glEnableVertexAttribArray(1); |
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glBindVertexArray(0); // Unbind VAO
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// Image to texture
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glGenTextures(1, &data.textureID); |
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glBindTexture(GL_TEXTURE_2D, data.textureID); |
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img.cols, img.rows, 0, GL_BGR, GL_UNSIGNED_BYTE, img.data); |
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); |
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); |
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
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glBindTexture(GL_TEXTURE_2D, 0); |
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setOpenGlDrawCallback("OpenGL", draw, &data); |
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for (;;) |
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{ |
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updateWindow("OpenGL"); |
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char key = (char)waitKey(40); |
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if (key == 27) |
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break; |
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} |
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setOpenGlDrawCallback("OpenGL", 0, 0); |
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destroyAllWindows(); |
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return 0; |
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} |
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