1 files changed, 139 insertions, 0 deletions
diff --git a/progs/tests/tex1d.c b/progs/tests/tex1d.c
new file mode 100644
index 000000000..1fab849dd
--- /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;
+}