1
2#include <assert.h>
3#include <stdio.h>
4#include <string.h>
5#include <stdlib.h>
6#include <GL/glew.h>
7#include "glut_wrap.h"
8
9#include "readtex.c"
10
11
12#define TEXTURE_FILE DEMOS_DATA_DIR "girl.rgb"
13
14
15
16static void Init( void )
17{
18   static const char *modulate2D =
19      "!!ARBfp1.0\n"
20      "TEX result.color, fragment.color, texture[0], 2D; \n"
21      "END"
22      ;
23   GLuint modulateProg;
24   GLuint Texture;
25
26   if (!GLEW_ARB_fragment_program) {
27      printf("Error: GL_ARB_fragment_program not supported!\n");
28      exit(1);
29   }
30   printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
31
32   /* Setup the fragment program */
33   glGenProgramsARB(1, &modulateProg);
34   glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, modulateProg);
35   glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
36                        strlen(modulate2D), (const GLubyte *)modulate2D);
37
38   printf("glGetError = 0x%x\n", (int) glGetError());
39   printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n",
40          (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
41   assert(glIsProgramARB(modulateProg));
42
43   glEnable(GL_FRAGMENT_PROGRAM_ARB);
44
45   /* Load texture */
46   glGenTextures(1, &Texture);
47   glBindTexture(GL_TEXTURE_2D, Texture);
48   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
49   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
50   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
51   if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) {
52      printf("Error: couldn't load texture image file %s\n", TEXTURE_FILE);
53      exit(1);
54   }
55   /* XXX this enable shouldn't really be needed!!! */
56   glEnable(GL_TEXTURE_2D);
57
58   glClearColor(.3, .3, .3, 0);
59}
60
61static void Reshape(int width, int height)
62{
63
64    glViewport(0, 0, (GLint)width, (GLint)height);
65
66    glMatrixMode(GL_PROJECTION);
67    glLoadIdentity();
68    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
69    glMatrixMode(GL_MODELVIEW);
70}
71
72static void Key(unsigned char key, int x, int y)
73{
74
75    switch (key) {
76      case 27:
77	exit(1);
78      default:
79	break;
80    }
81
82    glutPostRedisplay();
83}
84
85static void Draw(void)
86{
87   glClear(GL_COLOR_BUFFER_BIT);
88
89   glBegin(GL_TRIANGLES);
90   glColor3f(0,0,1);
91/*    glTexCoord2f(1, 0); */
92   glVertex3f( 0.9, -0.9, -30.0);
93   glColor3f(1,0,0);
94/*    glTexCoord2f(1, 1); */
95   glVertex3f( 0.9,  0.9, -30.0);
96   glColor3f(0,1,0);
97/*    glTexCoord2f(0, .5); */
98   glVertex3f(-0.9,  0.0, -30.0);
99   glEnd();
100
101   glFlush();
102}
103
104
105int main(int argc, char **argv)
106{
107    GLenum type;
108
109    glutInit(&argc, argv);
110
111
112
113    glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
114
115    type = GLUT_RGB;
116    type |= GLUT_SINGLE;
117    glutInitDisplayMode(type);
118
119    if (glutCreateWindow("First Tri") == GL_FALSE) {
120	exit(1);
121    }
122
123    glewInit();
124
125    Init();
126
127    glutReshapeFunc(Reshape);
128    glutKeyboardFunc(Key);
129    glutDisplayFunc(Draw);
130    glutMainLoop();
131	return 0;
132}
133