83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
#include <SDL.h>
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include <stdio.h>
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#define WIDTH 500
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#define HEIGHT 500
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void init(void)
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{
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glClearColor (0.0, 0.0, 0.0, 0.0);
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glEnable(GL_DEPTH_TEST);
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glShadeModel(GL_FLAT);
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glViewport(0, 0, WIDTH, HEIGHT);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(-0.5, WIDTH - 0.5, -0.5, HEIGHT - 0.5, -1, 1);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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}
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void display(SDL_Window * window)
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{
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glColor3f(1, 1, 1);
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glBegin(GL_QUADS);
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glVertex3f(10, HEIGHT / 2, 0.0);
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glVertex3f(10, 3 * HEIGHT / 4, 0.0);
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glVertex3f(WIDTH / 2, 3 * HEIGHT / 4, 0.0);
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glVertex3f(WIDTH / 2, HEIGHT / 2, 0.0);
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glEnd();
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glColor3f(1, 0.6, 0);
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glBegin(GL_LINE_LOOP);
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glVertex2f(0, 0);
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glVertex2f(WIDTH - 1, 0);
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glVertex2f(WIDTH - 1, HEIGHT - 1);
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glVertex2f(0, HEIGHT - 1);
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glEnd();
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SDL_GL_SwapWindow(window);
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}
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int main(int argc, char *argv[])
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{
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if (SDL_Init(SDL_INIT_VIDEO))
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{
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printf("Failed to initialize SDL!\n");
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return 1;
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}
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atexit(SDL_Quit);
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SDL_Window * window = SDL_CreateWindow(argv[0],
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SDL_WINDOWPOS_UNDEFINED,
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SDL_WINDOWPOS_UNDEFINED,
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WIDTH,
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HEIGHT,
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SDL_WINDOW_OPENGL);
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if (!window)
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{
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printf("Failed to create window!\n");
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SDL_Quit();
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return 2;
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}
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SDL_GLContext gl_context = SDL_GL_CreateContext(window);
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init();
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display(window);
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SDL_Event event;
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while (SDL_WaitEvent(&event))
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{
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if (event.type == SDL_QUIT)
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break;
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else if (event.type == SDL_KEYDOWN)
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{
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if (event.key.keysym.sym == SDLK_ESCAPE)
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break;
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if (event.key.keysym.sym == SDLK_RETURN)
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display(window);
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}
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}
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}
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