+++ /dev/null
-/*
- * (C) Copyright IBM Corporation 2005
- * All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * on the rights to use, copy, modify, merge, publish, distribute, sub
- * license, and/or sell copies of the Software, and to permit persons to whom
- * the Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice (including the next
- * paragraph) shall be included in all copies or substantial portions of the
- * Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
- * IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
- * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
- * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
- * USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-#include <GL/glew.h>
-#include <GL/glut.h>
-
-const GLenum filter_modes[] = {
- GL_NEAREST,
- GL_LINEAR,
- GL_NEAREST_MIPMAP_NEAREST,
- GL_NEAREST_MIPMAP_LINEAR,
- GL_LINEAR_MIPMAP_NEAREST,
- GL_LINEAR_MIPMAP_LINEAR,
-};
-
-static GLenum min_filter = GL_LINEAR_MIPMAP_LINEAR;
-static GLenum mag_filter = GL_LINEAR;
-
-static unsigned segments = 64;
-static GLfloat * position_data = NULL;
-static GLfloat * texcoord_data = NULL;
-static GLfloat max_anisotropy = 0.0;
-static GLfloat anisotropy = 1.0;
-
-static void generate_tunnel( unsigned num_segs, GLfloat ** pos_data,
- GLfloat ** tex_data );
-static void generate_textures( unsigned mode );
-
-#define min(a,b) ( (a) < (b) ) ? (a) : (b)
-#define max(a,b) ( (a) > (b) ) ? (a) : (b)
-
-
-static void Display( void )
-{
- glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, min_filter );
- glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag_filter );
-
- if ( max_anisotropy > 0.0 ) {
- glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT,
- anisotropy );
- }
-
- glClear( GL_COLOR_BUFFER_BIT );
- glLoadIdentity();
- glTranslatef( 0.0f, 0.0f, -19.0f );
-
- glVertexPointer( 4, GL_FLOAT, 0, position_data );
- glTexCoordPointer( 2, GL_FLOAT, 0, texcoord_data );
- glEnableClientState( GL_VERTEX_ARRAY );
- glEnableClientState( GL_TEXTURE_COORD_ARRAY );
- glDrawArrays( GL_QUADS, 0, 4 * segments );
- glutSwapBuffers();
-}
-
-
-static void Reshape( int width, int height )
-{
- glViewport(0, 0, width, height);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluPerspective(45.0f, (GLfloat)(width)/(GLfloat)(height), 0.1f, 100.0f);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
-}
-
-
-static void Key( unsigned char key, int x, int y )
-{
- GLfloat new_anisotropy = anisotropy;
-
- (void) x;
- (void) y;
-
-
- switch( key ) {
- case 'a': {
- new_anisotropy = anisotropy - 1.0;
- break;
- }
-
- case 'A': {
- new_anisotropy = anisotropy + 1.0;
- break;
- }
-
- case 's': {
- segments--;
- if ( segments < 3 ) {
- segments = 3;
- }
- generate_tunnel( segments, & position_data, & texcoord_data );
- break;
- }
-
- case 'S': {
- segments++;
- if ( segments > 128 ) {
- segments = 128;
- }
- generate_tunnel( segments, & position_data, & texcoord_data );
- break;
- }
- case 'q':
- case 'Q':
- case 27:
- exit(0);
- break;
- }
-
- new_anisotropy = max( new_anisotropy, 1.0 );
- new_anisotropy = min( new_anisotropy, max_anisotropy );
- if ( new_anisotropy != anisotropy ) {
- anisotropy = new_anisotropy;
- printf( "Texture anisotropy: %f%s\n", anisotropy,
- (anisotropy == 1.0) ? " (disabled)" : "" );
- }
-
- glutPostRedisplay();
-}
-
-
-static void SpecialKey( int key, int x, int y )
-{
- (void) x;
- (void) y;
- (void) key;
- glutPostRedisplay();
-}
-
-
-static void menu_handler( int selection )
-{
- switch( selection >> 3 ) {
- case 0:
- glBindTexture( GL_TEXTURE_2D, selection );
- break;
-
- case 1:
- min_filter = filter_modes[ selection & 7 ];
- break;
-
- case 2:
- mag_filter = filter_modes[ selection & 7 ];
- break;
- }
-
- glutPostRedisplay();
-}
-
-
-static void Init( void )
-{
- glDisable(GL_CULL_FACE);
- glEnable(GL_TEXTURE_2D);
- glClearColor(0.0f, 0.0f, 0.4f, 0.0f);
- glShadeModel(GL_SMOOTH);
- glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
-
- generate_tunnel( segments, & position_data, & texcoord_data );
-
- glBindTexture( GL_TEXTURE_2D, 1 );
- generate_textures(1);
-
- glBindTexture( GL_TEXTURE_2D, 2 );
- generate_textures(2);
-
- glBindTexture( GL_TEXTURE_2D, 3 );
- generate_textures(3);
-
- if ( glutExtensionSupported( "GL_EXT_texture_filter_anisotropic" ) ) {
- glGetFloatv( GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, & max_anisotropy );
- }
-
- printf("Maximum texture anisotropy: %f\n", max_anisotropy );
-
- /* Create the menus. */
-
- glutCreateMenu( menu_handler );
- glutAddMenuEntry( "Min filter: GL_NEAREST", 8 + 0 );
- glutAddMenuEntry( "Min filter: GL_LINEAR", 8 + 1 );
- glutAddMenuEntry( "Min filter: GL_NEAREST_MIMMAP_NEAREST", 8 + 2 );
- glutAddMenuEntry( "Min filter: GL_NEAREST_MIMMAP_LINEAR", 8 + 3 );
- glutAddMenuEntry( "Min filter: GL_LINEAR_MIMMAP_NEAREST", 8 + 4 );
- glutAddMenuEntry( "Min filter: GL_LINEAR_MIMMAP_LINEAR", 8 + 5 );
- glutAddMenuEntry( "Mag filter: GL_NEAREST", 16 + 0 );
- glutAddMenuEntry( "Mag filter: GL_LINEAR", 16 + 1 );
- glutAddMenuEntry( "Texture: regular mipmaps", 1 );
- glutAddMenuEntry( "Texture: blended mipmaps", 2 );
- glutAddMenuEntry( "Texture: color mipmaps", 3 );
- glutAttachMenu( GLUT_RIGHT_BUTTON );
-}
-
-
-static void generate_tunnel( unsigned num_segs, GLfloat ** pos_data,
- GLfloat ** tex_data )
-{
- const GLfloat far_distance = 20.0f;
- const GLfloat near_distance = -90.0f;
- const GLfloat far_tex = 30.0f;
- const GLfloat near_tex = 0.0f;
- const GLfloat angle_step = (2 * M_PI) / num_segs;
- const GLfloat tex_coord_step = 2.0 / num_segs;
- GLfloat angle = 0.0f;
- GLfloat tex_coord = 0.0f;
- unsigned i;
- GLfloat * position;
- GLfloat * texture;
-
-
- position = realloc( *pos_data, sizeof( GLfloat ) * num_segs * 4 * 4 );
- texture = realloc( *tex_data, sizeof( GLfloat ) * num_segs * 4 * 2 );
-
- *pos_data = position;
- *tex_data = texture;
-
- for ( i = 0 ; i < num_segs ; i++ ) {
- position[0] = 2.5 * sinf( angle );
- position[1] = 2.5 * cosf( angle );
- position[2] = (i & 1) ? far_distance : near_distance;
- position[3] = 1.0f;
-
- position[4] = position[0];
- position[5] = position[1];
- position[6] = (i & 1) ? near_distance : far_distance;
- position[7] = 1.0f;
-
- position += 8;
-
- texture[0] = tex_coord;
- texture[1] = (i & 1) ? far_tex : near_tex;
- texture += 2;
-
- texture[0] = tex_coord;
- texture[1] = (i & 1) ? near_tex : far_tex;
- texture += 2;
-
- angle += angle_step;
- tex_coord += tex_coord_step;
-
- position[0] = 2.5 * sinf( angle );
- position[1] = 2.5 * cosf( angle );
- position[2] = (i & 1) ? near_distance : far_distance;
- position[3] = 1.0f;
-
- position[4] = position[0];
- position[5] = position[1];
- position[6] = (i & 1) ? far_distance : near_distance;
- position[7] = 1.0f;
-
- position += 8;
-
- texture[0] = tex_coord;
- texture[1] = (i & 1) ? near_tex : far_tex;
- texture += 2;
-
- texture[0] = tex_coord;
- texture[1] = (i & 1) ? far_tex : near_tex;
- texture += 2;
- }
-}
-
-
-static void generate_textures( unsigned mode )
-{
-#define LEVEL_COLORS 6
- const GLfloat colors[LEVEL_COLORS][3] = {
- { 1.0, 0.0, 0.0 }, /* 32 x 32 */
- { 0.0, 1.0, 0.0 }, /* 16 x 16 */
- { 0.0, 0.0, 1.0 }, /* 8 x 8 */
- { 1.0, 0.0, 1.0 }, /* 4 x 4 */
- { 1.0, 1.0, 1.0 }, /* 2 x 2 */
- { 1.0, 1.0, 0.0 } /* 1 x 1 */
- };
- const unsigned checkers_per_level = 2;
- GLfloat * tex;
- unsigned level;
- unsigned size;
- GLint max_size;
-
-
- glGetIntegerv( GL_MAX_TEXTURE_SIZE, & max_size );
- if ( max_size > 512 ) {
- max_size = 512;
- }
-
- tex = malloc( sizeof( GLfloat ) * 3 * max_size * max_size );
-
- level = 0;
- for ( size = max_size ; size > 0 ; size >>= 1 ) {
- unsigned divisor = size / checkers_per_level;
- unsigned i;
- unsigned j;
- GLfloat checkers[2][3];
-
-
- if ((level == 0) || (mode == 1)) {
- checkers[0][0] = 1.0;
- checkers[0][1] = 1.0;
- checkers[0][2] = 1.0;
- checkers[1][0] = 0.0;
- checkers[1][1] = 0.0;
- checkers[1][2] = 0.0;
- }
- else if (mode == 2) {
- checkers[0][0] = colors[level % LEVEL_COLORS][0];
- checkers[0][1] = colors[level % LEVEL_COLORS][1];
- checkers[0][2] = colors[level % LEVEL_COLORS][2];
- checkers[1][0] = colors[level % LEVEL_COLORS][0] * 0.5;
- checkers[1][1] = colors[level % LEVEL_COLORS][1] * 0.5;
- checkers[1][2] = colors[level % LEVEL_COLORS][2] * 0.5;
- }
- else {
- checkers[0][0] = colors[level % LEVEL_COLORS][0];
- checkers[0][1] = colors[level % LEVEL_COLORS][1];
- checkers[0][2] = colors[level % LEVEL_COLORS][2];
- checkers[1][0] = colors[level % LEVEL_COLORS][0];
- checkers[1][1] = colors[level % LEVEL_COLORS][1];
- checkers[1][2] = colors[level % LEVEL_COLORS][2];
- }
-
- if ( divisor == 0 ) {
- divisor = 1;
-
- checkers[0][0] = (checkers[0][0] + checkers[1][0]) / 2;
- checkers[0][1] = (checkers[0][0] + checkers[1][0]) / 2;
- checkers[0][2] = (checkers[0][0] + checkers[1][0]) / 2;
- checkers[1][0] = checkers[0][0];
- checkers[1][1] = checkers[0][1];
- checkers[1][2] = checkers[0][2];
- }
-
-
- for ( i = 0 ; i < size ; i++ ) {
- for ( j = 0 ; j < size ; j++ ) {
- const unsigned idx = ((i ^ j) / divisor) & 1;
-
- tex[ ((i * size) + j) * 3 + 0] = checkers[ idx ][0];
- tex[ ((i * size) + j) * 3 + 1] = checkers[ idx ][1];
- tex[ ((i * size) + j) * 3 + 2] = checkers[ idx ][2];
- }
- }
-
- glTexImage2D( GL_TEXTURE_2D, level, GL_RGB, size, size, 0,
- GL_RGB, GL_FLOAT, tex );
- level++;
- }
-
- free( tex );
-}
-
-
-int main( int argc, char ** argv )
-{
- glutInit( &argc, argv );
- glutInitWindowPosition( 0, 0 );
- glutInitWindowSize( 800, 600 );
- glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
- glutCreateWindow( "Texture Filter Test" );
- glewInit();
- glutReshapeFunc( Reshape );
- glutKeyboardFunc( Key );
- glutSpecialFunc( SpecialKey );
- glutDisplayFunc( Display );
-
- Init();
-
- printf("\nUse the right-button menu to select the texture and filter mode.\n");
- printf("Use 'A' and 'a' to increase and decrease the aniotropy.\n");
- printf("Use 'S' and 's' to increase and decrease the number of cylinder segments.\n");
- printf("Use 'q' to exit.\n\n");
-
- glutMainLoop();
- return 0;
-}
projects / mesa.git / blobdiff