1
2#include <stdio.h>
3#include <string.h>
4#include <stdlib.h>
5#include <GL/glew.h>
6#include "glut_wrap.h"
7
8
9static void Init( void )
10{
11   static const char *modulate2D =
12      "!!ARBfp1.0\n"
13      "MOV result.color, program.local[32]; \n"
14      "END"
15      ;
16   GLuint modulateProg;
17
18   if (!GLEW_ARB_fragment_program) {
19      printf("Error: GL_ARB_fragment_program not supported!\n");
20      exit(1);
21   }
22   printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
23
24   /* Setup the fragment program */
25   glGenProgramsARB(1, &modulateProg);
26   glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, modulateProg);
27   glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
28                        strlen(modulate2D), (const GLubyte *)modulate2D);
29
30   printf("glGetError = 0x%x\n", (int) glGetError());
31   printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n",
32          (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
33
34   glEnable(GL_FRAGMENT_PROGRAM_ARB);
35
36   glClearColor(.3, .3, .3, 0);
37}
38
39static void Reshape(int width, int height)
40{
41
42    glViewport(0, 0, (GLint)width, (GLint)height);
43
44    glMatrixMode(GL_PROJECTION);
45    glLoadIdentity();
46    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
47    glMatrixMode(GL_MODELVIEW);
48}
49
50static void Key(unsigned char key, int x, int y)
51{
52
53    switch (key) {
54      case 27:
55	exit(1);
56      default:
57	break;
58    }
59
60    glutPostRedisplay();
61}
62
63static void Draw(void)
64{
65   glClear(GL_COLOR_BUFFER_BIT);
66   glProgramLocalParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 32, 0.25, .5, 0.25, 1);
67
68   glBegin(GL_TRIANGLES);
69   glColor3f(0,0,1);
70   glVertex3f( 0.9, -0.9, -30.0);
71   glColor3f(1,0,0);
72   glVertex3f( 0.9,  0.0, -30.0);
73   glColor3f(0,1,0);
74   glVertex3f(-0.9,  0.0, -30.0);
75   glEnd();
76
77   glProgramLocalParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 32, 0.25, 0, 0.25, 1);
78
79   glBegin(GL_TRIANGLES);
80   glColor3f(0,0,1);
81   glVertex3f( 0.9,  0.0, -30.0);
82   glColor3f(1,0,0);
83   glVertex3f( 0.9,  0.9, -30.0);
84   glColor3f(0,1,0);
85   glVertex3f(-0.9,  0.0, -30.0);
86   glEnd();
87
88   glFlush();
89}
90
91
92int main(int argc, char **argv)
93{
94    GLenum type;
95
96    glutInit(&argc, argv);
97
98    glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
99
100    type = GLUT_RGB | GLUT_SINGLE;
101    glutInitDisplayMode(type);
102
103    if (glutCreateWindow("First Tri") == GL_FALSE) {
104	exit(1);
105    }
106
107    glewInit();
108
109    Init();
110
111    glutReshapeFunc(Reshape);
112    glutKeyboardFunc(Key);
113    glutDisplayFunc(Draw);
114    glutMainLoop();
115	return 0;
116}
117