| /* |
| * 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/glew.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); |
| |
| /* |
| * 1D Texture. Test proxy first, if that works, test non-proxy target. |
| */ |
| 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 || w == 0); |
| |
| if (w) { |
| glTexImage1D(GL_TEXTURE_1D, 0, GL_RGB, imgWidth, 0, |
| imgFormat, GL_UNSIGNED_BYTE, image); |
| assert(glGetError() == GL_NO_ERROR); |
| } |
| |
| |
| /* |
| * 2D Texture |
| */ |
| 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 || w == 0); |
| |
| if (w) { |
| glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, imgWidth, imgHeight, 0, |
| imgFormat, GL_UNSIGNED_BYTE, image); |
| assert(glGetError() == GL_NO_ERROR); |
| } |
| |
| |
| /* |
| * 3D Texture |
| */ |
| 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 || w == 0); |
| |
| if (w) { |
| glTexImage3D(GL_TEXTURE_3D, 0, GL_RGB, imgWidth, imgHeight, 1, 0, |
| imgFormat, GL_UNSIGNED_BYTE, image); |
| assert(glGetError() == GL_NO_ERROR); |
| } |
| |
| |
| /* |
| * Cube Texture |
| */ |
| 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 || w == 0); |
| |
| if (w) { |
| glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, GL_RGB, |
| minDim, minDim, 0, |
| imgFormat, GL_UNSIGNED_BYTE, image); |
| assert(glGetError() == GL_NO_ERROR); |
| } |
| |
| 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( 400, 400 ); |
| glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH ); |
| glutCreateWindow(argv[0]); |
| glewInit(); |
| glutReshapeFunc( Reshape ); |
| glutKeyboardFunc( Key ); |
| glutDisplayFunc( Display ); |
| Init(); |
| glutMainLoop(); |
| return 0; |
| } |