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Diffstat (limited to 'progs/demos/lodbias.c')
-rw-r--r-- | progs/demos/lodbias.c | 298 |
1 files changed, 0 insertions, 298 deletions
diff --git a/progs/demos/lodbias.c b/progs/demos/lodbias.c deleted file mode 100644 index 23488b1616..0000000000 --- a/progs/demos/lodbias.c +++ /dev/null @@ -1,298 +0,0 @@ -/* - * GL_EXT_texture_lod_bias demo - * - * Thanks to Michael Vance for implementing this extension in Mesa. - * - * Brian Paul - * 20 March 2000 - * - * Copyright (C) 2000 Brian Paul 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 - * the rights to use, copy, modify, merge, publish, distribute, sublicense, - * 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 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 NONINFRINGEMENT. IN NO EVENT SHALL - * BRIAN PAUL 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 <assert.h> -#include <stdlib.h> -#include <stdio.h> -#include <math.h> -#include <GL/glut.h> -#include <GL/glext.h> - -#include "readtex.h" - -#define TEXTURE_FILE "../images/girl.rgb" - -static GLfloat Xrot = 0, Yrot = -30, Zrot = 0; -static GLboolean Anim = GL_TRUE; -static GLint Bias = 0, BiasStepSign = +1; /* ints avoid fp precision problem */ -static GLint BiasMin = -400, BiasMax = 400; -static int win = 0; -static GLuint TexObj = 0; - - -static void -PrintString(const char *s) -{ - while (*s) { - glutBitmapCharacter(GLUT_BITMAP_8_BY_13, (int) *s); - s++; - } -} - -static void Idle( void ) -{ - static int lastTime = 0; - int time = glutGet(GLUT_ELAPSED_TIME); - int step; - - if (lastTime == 0) - lastTime = time; - else if (time - lastTime < 10) - return; - - step = (time - lastTime) / 10 * BiasStepSign; - lastTime = time; - - Bias += step; - if (Bias < BiasMin) { - Bias = BiasMin; - BiasStepSign = +1; - } - else if (Bias > BiasMax) { - Bias = BiasMax; - BiasStepSign = -1; - } - - glutPostRedisplay(); -} - - -static void Display( void ) -{ - char str[100]; - - glClear( GL_COLOR_BUFFER_BIT ); - - glMatrixMode( GL_PROJECTION ); - glLoadIdentity(); - glOrtho(-1, 1, -1, 1, -1, 1); - glMatrixMode( GL_MODELVIEW ); - glLoadIdentity(); - - glDisable(GL_TEXTURE_2D); - glColor3f(1,1,1); - glRasterPos3f(-0.9, -0.9, 0.0); - sprintf(str, "Texture LOD Bias = %4.1f", Bias * 0.01); - PrintString(str); - - 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, -8.0 ); - - glPushMatrix(); - glRotatef(Xrot, 1, 0, 0); - glRotatef(Yrot, 0, 1, 0); - glRotatef(Zrot, 0, 0, 1); - - glEnable(GL_TEXTURE_2D); - glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, 0.01 * Bias); - - glBegin(GL_POLYGON); - glTexCoord2f(0, 0); glVertex2f(-1, -1); - glTexCoord2f(2, 0); glVertex2f( 1, -1); - glTexCoord2f(2, 2); glVertex2f( 1, 1); - glTexCoord2f(0, 2); glVertex2f(-1, 1); - glEnd(); - - glPopMatrix(); - - glutSwapBuffers(); -} - - -static void Reshape( int width, int height ) -{ - glViewport( 0, 0, width, height ); -} - - -static void Key( unsigned char key, int x, int y ) -{ - const GLfloat step = 3.0; - (void) x; - (void) y; - switch (key) { - case 'a': - Anim = !Anim; - if (Anim) - glutIdleFunc(Idle); - else - glutIdleFunc(NULL); - break; - case 'z': - Zrot -= step; - break; - case 'Z': - Zrot += step; - break; - case 'b': - Bias -= 10; - break; - case 'B': - Bias += 10; - break; - case '0': - case '1': - case '2': - case '3': - case '4': - case '5': - case '6': - case '7': - case '8': - case '9': - Bias = 100.0 * (key - '0'); - break; - case 27: - glutDestroyWindow(win); - exit(0); - break; - } - glutPostRedisplay(); -} - - -static void SpecialKey( int key, int x, int y ) -{ - const GLfloat step = 3.0; - (void) x; - (void) y; - switch (key) { - case GLUT_KEY_UP: - Xrot -= step; - break; - case GLUT_KEY_DOWN: - Xrot += step; - break; - case GLUT_KEY_LEFT: - Yrot -= step; - break; - case GLUT_KEY_RIGHT: - Yrot += step; - break; - } - glutPostRedisplay(); -} - - -static void Init( void ) -{ - GLfloat maxBias; - - if (!glutExtensionSupported("GL_EXT_texture_lod_bias")) { - printf("Sorry, GL_EXT_texture_lod_bias not supported by this renderer.\n"); - exit(1); - } - - glPixelStorei(GL_UNPACK_ALIGNMENT, 1); - - glGenTextures(1, &TexObj); - glBindTexture(GL_TEXTURE_2D, TexObj); - - if (glutExtensionSupported("GL_SGIS_generate_mipmap")) { - /* test auto mipmap generation */ - GLint width, height, i; - GLenum format; - GLubyte *image = LoadRGBImage(TEXTURE_FILE, &width, &height, &format); - if (!image) { - printf("Error: could not load texture image %s\n", TEXTURE_FILE); - exit(1); - } - /* resize to 256 x 256 */ - if (width != 256 || height != 256) { - GLubyte *newImage = malloc(256 * 256 * 4); - gluScaleImage(format, width, height, GL_UNSIGNED_BYTE, image, - 256, 256, GL_UNSIGNED_BYTE, newImage); - free(image); - image = newImage; - } - printf("Using GL_SGIS_generate_mipmap\n"); - glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE); - glTexImage2D(GL_TEXTURE_2D, 0, format, 256, 256, 0, - format, GL_UNSIGNED_BYTE, image); - free(image); - - /* make sure mipmap was really generated correctly */ - width = height = 256; - for (i = 0; i < 9; i++) { - GLint w, h; - glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_WIDTH, &w); - glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_HEIGHT, &h); - printf("Level %d size: %d x %d\n", i, w, h); - assert(w == width); - assert(h == height); - width /= 2; - height /= 2; - } - - } - else if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) { - printf("Error: could not load texture image %s\n", TEXTURE_FILE); - exit(1); - } - - /* mipmapping required for this extension */ - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); - glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); - - glGetFloatv(GL_MAX_TEXTURE_LOD_BIAS_EXT, &maxBias); - printf("LOD bias range: [%g, %g]\n", -maxBias, maxBias); - BiasMin = -100 * maxBias; - BiasMax = 100 * maxBias; - - /* Since we have (about) 8 mipmap levels, no need to bias beyond - * the range [-1, +8]. - */ - if (BiasMin < -100) - BiasMin = -100; - if (BiasMax > 800) - BiasMax = 800; -} - - -int main( int argc, char *argv[] ) -{ - glutInitWindowSize( 350, 350 ); - glutInit( &argc, argv ); - glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE ); - win = glutCreateWindow(argv[0]); - glutReshapeFunc( Reshape ); - glutKeyboardFunc( Key ); - glutSpecialFunc( SpecialKey ); - glutDisplayFunc( Display ); - if (Anim) - glutIdleFunc(Idle); - Init(); - glutMainLoop(); - return 0; -} |