+++ /dev/null
-/*
- * 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;
-}
projects / mesa.git / blobdiff