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-rw-r--r--progs/tests/tex1d.c139
1 files changed, 139 insertions, 0 deletions
diff --git a/progs/tests/tex1d.c b/progs/tests/tex1d.c
new file mode 100644
index 00000000000..1fab849dd3e
--- /dev/null
+++ b/progs/tests/tex1d.c
@@ -0,0 +1,139 @@
+
+/* Exercise 1D textures
+ */
+
+#include <assert.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "GL/glut.h"
+
+static GLuint Window = 0;
+static GLuint TexObj[2];
+static GLfloat Angle = 0.0f;
+
+
+static void draw( void )
+{
+ glClear( GL_COLOR_BUFFER_BIT );
+
+ glColor3f( 1.0, 1.0, 1.0 );
+
+ /* draw first polygon */
+ glPushMatrix();
+ glTranslatef( -1.0, 0.0, 0.0 );
+ glRotatef( Angle, 0.0, 0.0, 1.0 );
+ glBindTexture( GL_TEXTURE_1D, TexObj[0] );
+ glBegin( GL_POLYGON );
+ glTexCoord1f( 0.0 ); glVertex2f( -1.0, -1.0 );
+ glTexCoord1f( 1.0 ); glVertex2f( 1.0, -1.0 );
+ glTexCoord1f( 1.0 ); glVertex2f( 1.0, 1.0 );
+ glTexCoord1f( 0.0 ); glVertex2f( -1.0, 1.0 );
+ glEnd();
+ glPopMatrix();
+
+ glutSwapBuffers();
+}
+
+
+
+static void idle( void )
+{
+ Angle += 2.0;
+ glutPostRedisplay();
+}
+
+
+
+/* change view Angle, exit upon ESC */
+static void key(unsigned char k, int x, int y)
+{
+ (void) x;
+ (void) y;
+ switch (k) {
+ case 27:
+ exit(0);
+ }
+}
+
+
+
+/* new window size or exposure */
+static void reshape( int width, int height )
+{
+ glViewport(0, 0, (GLint)width, (GLint)height);
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ /* glOrtho( -3.0, 3.0, -3.0, 3.0, -10.0, 10.0 );*/
+ glFrustum( -2.0, 2.0, -2.0, 2.0, 6.0, 20.0 );
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+ glTranslatef( 0.0, 0.0, -8.0 );
+}
+
+
+static void init( void )
+{
+ GLubyte tex[256][3];
+ GLint i;
+
+
+ glDisable( GL_DITHER );
+
+ /* Setup texturing */
+ glEnable( GL_TEXTURE_1D );
+ glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL );
+
+
+ /* generate texture object IDs */
+ glGenTextures( 2, TexObj );
+
+ /* setup first texture object */
+ glBindTexture( GL_TEXTURE_1D, TexObj[0] );
+
+
+ for (i = 0; i < 256; i++) {
+ GLfloat f;
+
+ /* map 0..255 to -PI .. PI */
+ f = ((i / 255.0) - .5) * (3.141592 * 2);
+
+ f = sin(f);
+
+ /* map -1..1 to 0..255 */
+ tex[i][0] = (f+1.0)/2.0 * 255.0;
+ tex[i][1] = 0;
+ tex[i][2] = 0;
+ }
+
+ glTexImage1D( GL_TEXTURE_1D, 0, 3, 256, 0, GL_RGB, GL_UNSIGNED_BYTE, tex );
+ glTexParameteri( GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
+ glTexParameteri( GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
+ glTexParameteri( GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_REPEAT );
+ glTexParameteri( GL_TEXTURE_1D, GL_TEXTURE_WRAP_T, GL_REPEAT );
+}
+
+
+
+int main( int argc, char *argv[] )
+{
+ glutInit(&argc, argv);
+ glutInitWindowPosition(0, 0);
+ glutInitWindowSize(300, 300);
+ glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
+
+ Window = glutCreateWindow("Texture Objects");
+ if (!Window) {
+ exit(1);
+ }
+
+ init();
+
+ glutReshapeFunc( reshape );
+ glutKeyboardFunc( key );
+/* glutIdleFunc( idle ); */
+ glutDisplayFunc( draw );
+ glutMainLoop();
+ return 0;
+}