git.mutantstargoat.com Git - erebus2020/blob - xerebus/src/main.c

   1 #include <stdio.h>
   2 #include "miniglut.h"
   3 #include "erebus.h"
   4
   5 static void display(void);
   6 static void reshape(int x, int y);
   7 static void keyb(unsigned char key, int x, int y);
   8 static void mouse(int bn, int st, int x, int y);
   9 static void motion(int x, int y);
  10
  11 static int win_width, win_height;
  12 static float win_aspect;
  13
  14 static struct erb_rend *erb;
  15
  16 static int mouse_x, mouse_y;
  17 static int drag_x, drag_y;
  18 static int drag;
  19
  20
  21 int main(int argc, char **argv)
  22 {
  23         glutInit(&argc, argv);
  24         glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
  25         glutInitWindowSize(1280, 800);
  26         glutCreateWindow("X erebus");
  27
  28         glutDisplayFunc(display);
  29         glutReshapeFunc(reshape);
  30         glutKeyboardFunc(keyb);
  31         glutMouseFunc(mouse);
  32         glutMotionFunc(motion);
  33
  34         if(!(erb = erb_create())) {
  35                 return 1;
  36         }
  37         reshape_pending = 1;
  38
  39         glutMainLoop();
  40         erb_destroy(erb);
  41         return 0;
  42 }
  43
  44 static void display(void)
  45 {
  46         if(reshape_pending) {
  47                 reshape_pending = 0;
  48
  49                 erb_allocframe(erb, x, y);
  50                 erb_begin(erb);
  51
  52                 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB32F, win_width, win_height, 0,
  53                                 GL_RGB, GL_FLOAT, erb_getframe(erb));
  54         }
  55         /* TODO: continue with getting notified when a block is done rendering */
  56
  57         glClear(GL_COLOR_BUFFER_BIT);
  58
  59         if(drag) {
  60                 glEnable(GL_LOGIC_OP);
  61                 glLogicOp(GL_XOR);
  62
  63                 glBegin(GL_LINE_LOOP);
  64                 glColor3f(1, 1, 1);
  65                 glVertex2f(drag_x, drag_y);
  66                 glVertex2f(mouse_x, drag_y);
  67                 glVertex2f(mouse_x, mouse_y);
  68                 glVertex2f(drag_x, mouse_y);
  69                 glEnd();
  70
  71                 glDisable(GL_LOGIC_OP);
  72         }
  73
  74         glutSwapBuffers();
  75 }
  76
  77 static void reshape(int x, int y)
  78 {
  79         win_width = x;
  80         win_height = y;
  81         win_aspect = (float)x / (float)y;
  82
  83         glViewport(0, 0, x, y);
  84
  85         glMatrixMode(GL_PROJECTION);
  86         glLoadIdentity();
  87         glOrtho(0, x, y, 0, -1, 1);
  88
  89         reshape_pending = 1;
  90         glutPostRedisplay();
  91 }
  92
  93 static void keyb(unsigned char key, int x, int y)
  94 {
  95         if(key == 27) {
  96                 glutExit();
  97         }
  98 }
  99
 100 static void mouse(int bn, int st, int x, int y)
 101 {
 102         int rect[4];
 103
 104         mouse_x = x;
 105         mouse_y = y;
 106
 107         if(bn == 0) {
 108                 if(st == GLUT_DOWN) {
 109                         drag = 1;
 110                         drag_x = x;
 111                         drag_y = y;
 112                 } else {
 113                         drag = 0;
 114
 115                         rect[0] = x < drag_x ? x : drag_x;
 116                         rect[1] = y < drag_y ? y : drag_y;
 117                         rect[2] = abs(x - drag_x);
 118                         rect[3] = abs(y - drag_y);
 119                         printf("rect: %d,%d %dx%d\n", rect[0], rect[1], rect[2], rect[3]);
 120                 }
 121
 122                 glutPostRedisplay();
 123         }
 124 }
 125
 126 static void motion(int x, int y)
 127 {
 128         mouse_x = x;
 129         mouse_y = y;
 130
 131         glutPostRedisplay();
 132 }