world_of_cow/mmn_17.c

#include <GL/freeglut.h>
#include <GL/freeglut_std.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <stdio.h>
#include <math.h>
#include "ui.h"
// Ui stuff
ui_button buttons[] = {
    { 
            /* pos */ { { 0.5, 0.5, 0.0 }, { -50.0, -25.0, 0.0 } },
            /* size */ { 100.0, 50.0, 0.0 },
            /* onclick */ NULL,
            /* text */ "Test :)"
        }
};

void display(void) {
    // Clear screen
    glClearColor(0.0, 0.0, 0.0, 1.0); // Dark theme :)
    glClear(GL_COLOR_BUFFER_BIT);
    // Draw buttons
    for(ui_button* b = buttons; b < buttons + sizeof buttons / sizeof(ui_button); b += 1) {
        ui_button_draw(b);
    }
    int err = glGetError();
    if(err != 0) {
        printf("opengl error %d: %s\n", err, gluErrorString(err));
    }
    glutSwapBuffers();
    glFlush();
}

void mouseEvent(int button, int state, int x, int y) {
    
}

int main(int argc, char** argv) {
    /* initialize glut and window */
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
    glutInitWindowSize(800, 500);
    glutInitWindowPosition(450, 450);
    /* create window and set callbacks */
    glutCreateWindow("World of Cow");
    glutDisplayFunc(display);
    glutMouseFunc(mouseEvent);
    
    /* set projection and camera */
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0.0, 800.0, 0.0, 500.0);
    
    glutMainLoop();
    
    return 0;
}