175 lines
4.4 KiB
C
175 lines
4.4 KiB
C
|
/*
|
||
|
* 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;
|
||
|
}
|