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
9
10static void Init( void )
11{
12   /* scale of 10.0 gives me a visible result on nv hardware.
13    */
14   static const char *modulate2D =
15      "!!ARBfp1.0\n"
16      "TEMP R0;\n"
17      "MUL R0, fragment.position.z, {10.0}.x;\n"
18      "MOV result.color, R0; \n"
19      "END"
20      ;
21   GLuint modulateProg;
22
23   if (!GLEW_ARB_fragment_program) {
24      printf("Error: GL_ARB_fragment_program not supported!\n");
25      exit(1);
26   }
27   printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
28
29   /* Setup the fragment program */
30   glGenProgramsARB(1, &modulateProg);
31   glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, modulateProg);
32   glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
33                        strlen(modulate2D), (const GLubyte *)modulate2D);
34
35   printf("glGetError = 0x%x\n", (int) glGetError());
36   printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n",
37          (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
38
39   glEnable(GL_FRAGMENT_PROGRAM_ARB);
40
41   glClearColor(.3, .3, .3, 0);
42}
43
44static void Reshape(int width, int height)
45{
46
47    glViewport(0, 0, (GLint)width, (GLint)height);
48
49    glMatrixMode(GL_PROJECTION);
50    glLoadIdentity();
51    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
52    glMatrixMode(GL_MODELVIEW);
53}
54
55static void Key(unsigned char key, int x, int y)
56{
57
58    switch (key) {
59      case 27:
60	exit(1);
61      default:
62	break;
63    }
64
65    glutPostRedisplay();
66}
67
68static void Draw(void)
69{
70   glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
71   glEnable(GL_DEPTH_TEST);
72
73   glBegin(GL_TRIANGLES);
74   glColor3f(0,0,1);
75	glVertex3f( 0.9, -0.9, -30.0);
76	glVertex3f( 0.9,  0.9, -30.0);
77	glVertex3f(-0.9,  0.0, -30.0);
78   glColor3f(0,1,0);
79	glVertex3f(-0.9, -0.9, -40.0);
80	glVertex3f(-0.9,  0.9, -40.0);
81	glVertex3f( 0.9,  0.0, -25.0);
82   glEnd();
83
84   glFlush();
85
86
87}
88
89
90int main(int argc, char **argv)
91{
92    GLenum type;
93
94    glutInit(&argc, argv);
95
96
97
98    glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
99
100    type = GLUT_RGB | GLUT_DEPTH;
101    type |= GLUT_SINGLE;
102    glutInitDisplayMode(type);
103
104    if (glutCreateWindow("First Tri") == GL_FALSE) {
105	exit(1);
106    }
107
108    glewInit();
109
110    Init();
111
112    glutReshapeFunc(Reshape);
113    glutKeyboardFunc(Key);
114    glutDisplayFunc(Draw);
115    glutMainLoop();
116	return 0;
117}
118