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gerrit-public.fairphone.software / fp2-dev / platform / external / mesa3d / e5d351dcfde58777162552cf5cd2a9cd8299f4cd / . / progs / tests / tex1d.c
blob: 4abe1068c7b9c20372f49e2654b50b9c300c7676 [file] [log] [blame]
Keith Whitwellab41a962004-01-26 13:45:42 +0000[diff] [blame]1
2/* Exercise 1D textures
3 */
4
5#include <assert.h>
6#include <math.h>
7#include <stdio.h>
8#include <stdlib.h>
9#include <string.h>
Keith Whitwella58065d2009-03-10 13:11:23 +0000[diff] [blame]10#include "GL/glew.h"
Keith Whitwellab41a962004-01-26 13:45:42 +0000[diff] [blame]11#include "GL/glut.h"
12
13static GLuint Window = 0;
14static GLuint TexObj[2];
15static GLfloat Angle = 0.0f;
16
17
18static void draw( void )
19{
20 glClear( GL_COLOR_BUFFER_BIT );
21
22 glColor3f( 1.0, 1.0, 1.0 );
23
24 /* draw first polygon */
25 glPushMatrix();
26 glTranslatef( -1.0, 0.0, 0.0 );
27 glRotatef( Angle, 0.0, 0.0, 1.0 );
28 glBindTexture( GL_TEXTURE_1D, TexObj[0] );
29 glBegin( GL_POLYGON );
30 glTexCoord1f( 0.0 ); glVertex2f( -1.0, -1.0 );
31 glTexCoord1f( 1.0 ); glVertex2f( 1.0, -1.0 );
32 glTexCoord1f( 1.0 ); glVertex2f( 1.0, 1.0 );
33 glTexCoord1f( 0.0 ); glVertex2f( -1.0, 1.0 );
34 glEnd();
35 glPopMatrix();
36
37 glutSwapBuffers();
38}
39
40
41
42static void idle( void )
43{
44 Angle += 2.0;
45 glutPostRedisplay();
46}
47
48
49
50/* change view Angle, exit upon ESC */
51static void key(unsigned char k, int x, int y)
52{
53 (void) x;
54 (void) y;
55 switch (k) {
56 case 27:
57 exit(0);
58 }
59}
60
61
62
63/* new window size or exposure */
64static void reshape( int width, int height )
65{
66 glViewport(0, 0, (GLint)width, (GLint)height);
67 glMatrixMode(GL_PROJECTION);
68 glLoadIdentity();
69 /* glOrtho( -3.0, 3.0, -3.0, 3.0, -10.0, 10.0 );*/
70 glFrustum( -2.0, 2.0, -2.0, 2.0, 6.0, 20.0 );
71 glMatrixMode(GL_MODELVIEW);
72 glLoadIdentity();
73 glTranslatef( 0.0, 0.0, -8.0 );
74}
75
76
77static void init( void )
78{
79 GLubyte tex[256][3];
80 GLint i;
81
82
83 glDisable( GL_DITHER );
84
85 /* Setup texturing */
86 glEnable( GL_TEXTURE_1D );
87 glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL );
88
89
90 /* generate texture object IDs */
91 glGenTextures( 2, TexObj );
92
93 /* setup first texture object */
94 glBindTexture( GL_TEXTURE_1D, TexObj[0] );
95
96
97 for (i = 0; i < 256; i++) {
98 GLfloat f;
99
100 /* map 0..255 to -PI .. PI */
101 f = ((i / 255.0) - .5) * (3.141592 * 2);
102
103 f = sin(f);
104
105 /* map -1..1 to 0..255 */
106 tex[i][0] = (f+1.0)/2.0 * 255.0;
107 tex[i][1] = 0;
108 tex[i][2] = 0;
109 }
110
111 glTexImage1D( GL_TEXTURE_1D, 0, 3, 256, 0, GL_RGB, GL_UNSIGNED_BYTE, tex );
112 glTexParameteri( GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
113 glTexParameteri( GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
114 glTexParameteri( GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_REPEAT );
115 glTexParameteri( GL_TEXTURE_1D, GL_TEXTURE_WRAP_T, GL_REPEAT );
116}
117
118
119
120int main( int argc, char *argv[] )
121{
122 glutInit(&argc, argv);
123 glutInitWindowPosition(0, 0);
124 glutInitWindowSize(300, 300);
125 glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
126
127 Window = glutCreateWindow("Texture Objects");
Keith Whitwella58065d2009-03-10 13:11:23 +0000[diff] [blame]128 glewInit();
Keith Whitwellab41a962004-01-26 13:45:42 +0000[diff] [blame]129 if (!Window) {
130 exit(1);
131 }
132
133 init();
134
135 glutReshapeFunc( reshape );
136 glutKeyboardFunc( key );
137/* glutIdleFunc( idle ); */
138 glutDisplayFunc( draw );
139 glutMainLoop();
140 return 0;
141}