GL_ARB_texture_non_power_of_two test program

progs/tests/arbnpot.c

@@ -0,0 +1,174 @@
+/*
+ * Test NPOT textures with the GL_ARB_texture_non_power_of_two extension.
+ * Brian Paul
+ * 2 July 2003
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+#include "../util/readtex.c"
+
+#define IMAGE_FILE "../images/girl.rgb"
+
+static GLfloat Zrot = 0;
+
+static void Display( void )
+{
+   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+
+   glPushMatrix();
+   glRotatef(Zrot, 0, 0, 1);
+   glBegin(GL_POLYGON);
+   glTexCoord2f(0, 0);
+   glVertex2f(-1, -1);
+   glTexCoord2f(1, 0);
+   glVertex2f(1, -1);
+   glTexCoord2f(1, 1);
+   glVertex2f(1, 1);
+   glTexCoord2f(0, 1);
+   glVertex2f(-1, 1);
+   glEnd();
+   glPopMatrix();
+
+   glutSwapBuffers();
+}
+
+
+static void Reshape( int width, int height )
+{
+   glViewport( 0, 0, width, height );
+   glMatrixMode( GL_PROJECTION );
+   glLoadIdentity();
+   glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
+   glMatrixMode( GL_MODELVIEW );
+   glLoadIdentity();
+   glTranslatef( 0.0, 0.0, -7.0 );
+}
+
+
+static void Key( unsigned char key, int x, int y )
+{
+   (void) x;
+   (void) y;
+   switch (key) {
+      case 'z':
+         Zrot -= 1.0;
+         break;
+      case 'Z':
+         Zrot += 1.0;
+         break;
+      case 27:
+         exit(0);
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void Init( void )
+{
+   GLubyte *image;
+   int imgWidth, imgHeight, minDim, w;
+   GLenum imgFormat;
+
+   if (!glutExtensionSupported("GL_ARB_texture_non_power_of_two")) {
+      printf("Sorry, this program requires GL_ARB_texture_non_power_of_two\n");
+      exit(1);
+   }
+
+#if 1
+   image = LoadRGBImage( IMAGE_FILE, &imgWidth, &imgHeight, &imgFormat );
+   if (!image) {
+      printf("Couldn't read %s\n", IMAGE_FILE);
+      exit(0);
+   }
+#else
+   int i, j;
+   imgFormat = GL_RGB;
+   imgWidth = 3;
+   imgHeight = 3;
+   image = malloc(imgWidth * imgHeight * 3);
+   for (i = 0; i < imgHeight; i++) {
+      for (j = 0; j < imgWidth; j++) {
+         int k = (i * imgWidth + j) * 3;
+         if ((i + j) & 1) {
+            image[k+0] = 255;
+            image[k+1] = 0;
+            image[k+2] = 0;
+         }
+         else {
+            image[k+0] = 0;
+            image[k+1] = 255;
+            image[k+2] = 0;
+         }
+      }
+   }
+#endif
+
+   printf("Read %d x %d\n", imgWidth, imgHeight);
+
+   minDim = imgWidth < imgHeight ? imgWidth : imgHeight;
+
+   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+   glTexImage1D(GL_TEXTURE_1D, 0, GL_RGB, imgWidth, 0,
+                imgFormat, GL_UNSIGNED_BYTE, image);
+   assert(glGetError() == GL_NO_ERROR);
+
+   glTexImage1D(GL_PROXY_TEXTURE_1D, 0, GL_RGB, imgWidth, 0,
+                imgFormat, GL_UNSIGNED_BYTE, image);
+   glGetTexLevelParameteriv(GL_PROXY_TEXTURE_1D, 0, GL_TEXTURE_WIDTH, &w);
+   assert(w == imgWidth);
+
+   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, imgWidth, imgHeight, 0,
+                imgFormat, GL_UNSIGNED_BYTE, image);
+   assert(glGetError() == GL_NO_ERROR);
+
+   glTexImage2D(GL_PROXY_TEXTURE_2D, 0, GL_RGB, imgWidth, imgHeight, 0,
+                imgFormat, GL_UNSIGNED_BYTE, image);
+   glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &w);
+   assert(w == imgWidth);
+
+   glTexImage3D(GL_TEXTURE_3D, 0, GL_RGB, imgWidth, imgHeight, 1, 0,
+                imgFormat, GL_UNSIGNED_BYTE, image);
+   assert(glGetError() == GL_NO_ERROR);
+
+   glTexImage3D(GL_PROXY_TEXTURE_3D, 0, GL_RGB, imgWidth, imgHeight, 1, 0,
+                imgFormat, GL_UNSIGNED_BYTE, image);
+   glGetTexLevelParameteriv(GL_PROXY_TEXTURE_3D, 0, GL_TEXTURE_WIDTH, &w);
+   assert(w == imgWidth);
+
+   glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, GL_RGB,
+                minDim, minDim, 0,
+                imgFormat, GL_UNSIGNED_BYTE, image);
+   assert(glGetError() == GL_NO_ERROR);
+
+   glTexImage2D(GL_PROXY_TEXTURE_CUBE_MAP, 0, GL_RGB,
+                minDim, minDim, 0,
+                imgFormat, GL_UNSIGNED_BYTE, image);
+   glGetTexLevelParameteriv(GL_PROXY_TEXTURE_CUBE_MAP, 0, GL_TEXTURE_WIDTH, &w);
+   assert(w == minDim);
+
+
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+   glEnable(GL_TEXTURE_2D);
+}
+
+
+int main( int argc, char *argv[] )
+{
+   glutInit( &argc, argv );
+   glutInitWindowPosition( 0, 0 );
+   glutInitWindowSize( 40, 40 );
+   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
+   glutCreateWindow(argv[0]);
+   glutReshapeFunc( Reshape );
+   glutKeyboardFunc( Key );
+   glutDisplayFunc( Display );
+   Init();
+   glutMainLoop();
+   return 0;
+}