First attempts of OpenGL
This commit is contained in:
Caesar2011
301
imanox-chroma-matting-opengl/main.cpp
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301
imanox-chroma-matting-opengl/main.cpp
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#include <windows.h>
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#include <gl/gl.h>
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#include <iostream>
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#include <stdio.h>
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#include <jpeglib.h>
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#include <GLFW/glfw.h>
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using namespace std;
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LRESULT CALLBACK WindowProc(HWND, UINT, WPARAM, LPARAM);
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void EnableOpenGL(HWND hwnd, HDC*, HGLRC*);
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void DisableOpenGL(HWND, HDC, HGLRC);
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int * loadJpg(const char* Name) {
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unsigned char a, r, g, b;
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int width, height;
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struct jpeg_decompress_struct cinfo;
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struct jpeg_error_mgr jerr;
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FILE * infile; /* source file */
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JSAMPARRAY pJpegBuffer; /* Output row buffer */
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int row_stride; /* physical row width in output buffer */
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if ((infile = fopen(Name, "rb")) == NULL) {
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fprintf(stderr, "can't open %s\n", Name);
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return 0;
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}
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cinfo.err = jpeg_std_error(&jerr);
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jpeg_create_decompress(&cinfo);
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jpeg_stdio_src(&cinfo, infile);
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(void) jpeg_read_header(&cinfo, TRUE);
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(void) jpeg_start_decompress(&cinfo);
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width = cinfo.output_width;
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height = cinfo.output_height;
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unsigned char * pDummy = new unsigned char [width*height*4];
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unsigned char * pTest = pDummy;
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if (!pDummy) {
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printf("NO MEM FOR JPEG CONVERT!\n");
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return 0;
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}
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row_stride = width * cinfo.output_components;
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pJpegBuffer = (*cinfo.mem->alloc_sarray)
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((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
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while (cinfo.output_scanline < cinfo.output_height) {
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(void) jpeg_read_scanlines(&cinfo, pJpegBuffer, 1);
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for (int x = 0; x < width; x++) {
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a = 0; // alpha value is not supported on jpg
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r = pJpegBuffer[0][cinfo.output_components * x];
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if (cinfo.output_components > 2) {
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g = pJpegBuffer[0][cinfo.output_components * x + 1];
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b = pJpegBuffer[0][cinfo.output_components * x + 2];
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} else {
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g = r;
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b = r;
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}
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*(pDummy++) = b;
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*(pDummy++) = g;
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*(pDummy++) = r;
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*(pDummy++) = a;
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}
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}
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fclose(infile);
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(void) jpeg_finish_decompress(&cinfo);
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jpeg_destroy_decompress(&cinfo);
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/*BMap = (int*)pTest;
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Height = height;
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Width = width;
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Depth = 32;*/
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int * pJetze = (int*)pTest;
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cout << width << endl;
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return pJetze;
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}
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int WINAPI WinMain(HINSTANCE hInstance,
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HINSTANCE hPrevInstance,
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LPSTR lpCmdLine,
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int nCmdShow)
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{
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WNDCLASSEX wcex;
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HWND hwnd;
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HDC hDC;
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HGLRC hRC;
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MSG msg;
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BOOL bQuit = FALSE;
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float theta = 0.0f;
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/* register window class */
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wcex.cbSize = sizeof(WNDCLASSEX);
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wcex.style = CS_OWNDC;
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wcex.lpfnWndProc = WindowProc;
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wcex.cbClsExtra = 0;
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wcex.cbWndExtra = 0;
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wcex.hInstance = hInstance;
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wcex.hIcon = LoadIcon(NULL, IDI_APPLICATION);
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wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
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wcex.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
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wcex.lpszMenuName = NULL;
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wcex.lpszClassName = "GLSample";
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wcex.hIconSm = LoadIcon(NULL, IDI_APPLICATION);;
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int * pJetze = loadJpg("../img/foregrounds/2.jpeg");
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cout << pJetze[0] << endl;
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cout << pJetze[1] << endl;
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cout << pJetze[2] << endl;
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cout << pJetze[3] << endl;
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cout << "Hello world!" << endl;
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//glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 10, 10, 0, GL_RGBA8, GL_UNSIGNED_INT, pJetze);
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if (!RegisterClassEx(&wcex))
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return 0;
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/* create main window */
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hwnd = CreateWindowEx(0,
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"GLSample",
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"OpenGL Sample",
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WS_OVERLAPPEDWINDOW,
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CW_USEDEFAULT,
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CW_USEDEFAULT,
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256,
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256,
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NULL,
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NULL,
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hInstance,
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NULL);
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ShowWindow(hwnd, nCmdShow);
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/* enable OpenGL for the window */
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EnableOpenGL(hwnd, &hDC, &hRC);
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/* program main loop */
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bool first = true;
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while (!bQuit)
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{
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/* check for messages */
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if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
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{
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/* handle or dispatch messages */
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if (msg.message == WM_QUIT)
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{
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bQuit = TRUE;
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}
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else
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{
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TranslateMessage(&msg);
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DispatchMessage(&msg);
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}
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}
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else
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{
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if (first) {
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first = false;
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GLuint textureid;
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glGenTextures(1, &textureid);
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glBindTexture(GL_TEXTURE_2D, textureid);
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// Black/white checkerboard
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float pixels[] = {
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1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f,
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1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 1.0f
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};
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//glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 2, 2, 0, GL_RGB, GL_FLOAT, pixels);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 10, 10, 0, GL_RGBA8, GL_UNSIGNED_BYTE, pJetze);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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glBindTexture(GL_TEXTURE_2D, textureid);
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glBegin(GL_TRIANGLES);
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glTexCoord2f(0, 0); glVertex3f( -2, 0, -2 );
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glTexCoord2f(2, 0); glVertex3f( 2, 0, -2 );
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glTexCoord2f(0, 2); glVertex3f( -2, 2, -2 );
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glEnd();
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SwapBuffers(hDC);
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}
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/* OpenGL animation code goes here */
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//glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
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//glClear(GL_COLOR_BUFFER_BIT);
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/*glBindTexture(GL_TEXTURE_2D, *pJetze);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 10, 10, 0, GL_RGBA8, GL_UNSIGNED_BYTE, &pJetze);
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GLuint textures;
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glGenTextures(1, &textures);
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int width, height;
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unsigned char* image;
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//glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, textures);
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//image = SOIL_load_image("sample.png", &width, &height, 0, SOIL_LOAD_RGB);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 10, 10, 0, GL_RGBA8,
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GL_UNSIGNED_BYTE, pJetze);
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//SOIL_free_image_data(image);
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//glUniform1i(glGetUniformLocation(shaderProgram, "texKitten"), 0);
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glPushMatrix();
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glRotatef(theta, 0.0f, 0.0f, 1.0f);
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glBegin(GL_TRIANGLES);
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glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(0.0f, 1.0f);
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glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(0.87f, -0.5f);
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glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(-0.87f, -0.5f);
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glEnd();
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glPopMatrix();
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SwapBuffers(hDC);
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theta += 1.0f;
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Sleep (1);\**/
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}
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}
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/* shutdown OpenGL */
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DisableOpenGL(hwnd, hDC, hRC);
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/* destroy the window explicitly */
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DestroyWindow(hwnd);
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return msg.wParam;
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}
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LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
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{
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switch (uMsg)
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{
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case WM_CLOSE:
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PostQuitMessage(0);
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break;
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case WM_DESTROY:
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return 0;
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case WM_KEYDOWN:
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{
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switch (wParam)
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{
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case VK_ESCAPE:
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PostQuitMessage(0);
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break;
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}
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}
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break;
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default:
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return DefWindowProc(hwnd, uMsg, wParam, lParam);
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}
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return 0;
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}
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void EnableOpenGL(HWND hwnd, HDC* hDC, HGLRC* hRC)
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{
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PIXELFORMATDESCRIPTOR pfd;
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int iFormat;
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/* get the device context (DC) */
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*hDC = GetDC(hwnd);
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/* set the pixel format for the DC */
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ZeroMemory(&pfd, sizeof(pfd));
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pfd.nSize = sizeof(pfd);
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pfd.nVersion = 1;
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pfd.dwFlags = PFD_DRAW_TO_WINDOW |
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PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
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pfd.iPixelType = PFD_TYPE_RGBA;
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pfd.cColorBits = 24;
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pfd.cDepthBits = 16;
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pfd.iLayerType = PFD_MAIN_PLANE;
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iFormat = ChoosePixelFormat(*hDC, &pfd);
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SetPixelFormat(*hDC, iFormat, &pfd);
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/* create and enable the render context (RC) */
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*hRC = wglCreateContext(*hDC);
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wglMakeCurrent(*hDC, *hRC);
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}
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void DisableOpenGL (HWND hwnd, HDC hDC, HGLRC hRC)
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{
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wglMakeCurrent(NULL, NULL);
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wglDeleteContext(hRC);
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ReleaseDC(hwnd, hDC);
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}
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