+++ /dev/null
-/*
- * Compressed texture demo. Written by Daniel Borca.
- * This program is in the public domain.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-#include <string.h>
-#include <GL/glew.h>
-#include <GL/glut.h>
-
-#include "readtex.c" /* I know, this is a hack. */
-#define TEXTURE_FILE "../images/tree2.rgba"
-
-
-static float Rot = 0.0;
-static GLboolean Anim = 1;
-
-typedef struct {
- GLubyte *data;
- GLuint size;
- GLenum format;
- GLuint w, h;
-
- GLenum TC;
-
- GLubyte *cData;
- GLuint cSize;
- GLenum cFormat;
-} TEXTURE;
-
-static TEXTURE *Tx, t1, t2, t3;
-static GLboolean fxt1, dxtc, s3tc;
-
-
-static const char *TextureName (GLenum TC)
-{
- switch (TC) {
- case GL_RGB:
- return "RGB";
- case GL_RGBA:
- return "RGBA";
- case GL_COMPRESSED_RGB:
- return "COMPRESSED_RGB";
- case GL_COMPRESSED_RGBA:
- return "COMPRESSED_RGBA";
- case GL_COMPRESSED_RGB_FXT1_3DFX:
- return "GL_COMPRESSED_RGB_FXT1_3DFX";
- case GL_COMPRESSED_RGBA_FXT1_3DFX:
- return "GL_COMPRESSED_RGBA_FXT1_3DFX";
- case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
- return "GL_COMPRESSED_RGB_S3TC_DXT1_EXT";
- case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
- return "GL_COMPRESSED_RGBA_S3TC_DXT1_EXT";
- case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
- return "GL_COMPRESSED_RGBA_S3TC_DXT3_EXT";
- case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
- return "GL_COMPRESSED_RGBA_S3TC_DXT5_EXT";
- case GL_RGB_S3TC:
- return "GL_RGB_S3TC";
- case GL_RGB4_S3TC:
- return "GL_RGB4_S3TC";
- case GL_RGBA_S3TC:
- return "GL_RGBA_S3TC";
- case GL_RGBA4_S3TC:
- return "GL_RGBA4_S3TC";
- case 0:
- return "Invalid format";
- default:
- return "Unknown format";
- }
-}
-
-
-static void
-PrintString(const char *s)
-{
- while (*s) {
- glutBitmapCharacter(GLUT_BITMAP_8_BY_13, (int) *s);
- s++;
- }
-}
-
-
-static void Idle( void )
-{
- float t = glutGet(GLUT_ELAPSED_TIME) * 0.001; /* in seconds */
- Rot = t * 360 / 4; /* 1 rotation per 4 seconds */
- glutPostRedisplay();
-}
-
-
-static void Display( void )
-{
- /* draw background gradient */
- glDisable(GL_TEXTURE_2D);
- glBegin(GL_POLYGON);
- glColor3f(1.0, 0.0, 0.2); glVertex2f(-1.5, -1.0);
- glColor3f(1.0, 0.0, 0.2); glVertex2f( 1.5, -1.0);
- glColor3f(0.0, 0.0, 1.0); glVertex2f( 1.5, 1.0);
- glColor3f(0.0, 0.0, 1.0); glVertex2f(-1.5, 1.0);
- glEnd();
-
- glPushMatrix();
- glRotatef(Rot, 0, 0, 1);
-
- glEnable(GL_TEXTURE_2D);
- glEnable(GL_BLEND);
-
- glBegin(GL_POLYGON);
- glTexCoord2f(0, 1); glVertex2f(-1, -0.5);
- glTexCoord2f(1, 1); glVertex2f( 1, -0.5);
- glTexCoord2f(1, 0); glVertex2f( 1, 0.5);
- glTexCoord2f(0, 0); glVertex2f(-1, 0.5);
- glEnd();
-
- glPopMatrix();
-
- glDisable(GL_TEXTURE_2D);
-
- /* info */
- glDisable(GL_BLEND);
- glColor4f(1, 1, 1, 1);
-
- glRasterPos3f(-1.2, -0.7, 0);
- PrintString("Selected: ");
- PrintString(TextureName(Tx->TC));
- if (Tx->cData) {
- char tmp[64];
- glRasterPos3f(-1.2, -0.8, 0);
- PrintString("Internal: ");
- PrintString(TextureName(Tx->cFormat));
- glRasterPos3f(-1.2, -0.9, 0);
- PrintString("Size : ");
- sprintf(tmp, "%d (%d%% of %d)", Tx->cSize, Tx->cSize * 100 / Tx->size, Tx->size);
- PrintString(tmp);
- }
-
- glutSwapBuffers();
-}
-
-
-static void Reshape( int width, int height )
-{
- glViewport( 0, 0, width, height );
- glMatrixMode( GL_PROJECTION );
- glLoadIdentity();
- glOrtho( -1.5, 1.5, -1.0, 1.0, -1.0, 1.0 );
- glMatrixMode( GL_MODELVIEW );
- glLoadIdentity();
-}
-
-
-static void ReInit( GLenum TC, TEXTURE *Tx )
-{
- GLint rv, v;
-
- if ((Tx->TC == TC) && (Tx->cData != NULL)) {
- glCompressedTexImage2DARB(GL_TEXTURE_2D, /* target */
- 0, /* level */
- Tx->cFormat, /* real format */
- Tx->w, /* original width */
- Tx->h, /* original height */
- 0, /* border */
- Tx->cSize, /* compressed size*/
- Tx->cData); /* compressed data*/
- } else {
- glTexImage2D(GL_TEXTURE_2D, /* target */
- 0, /* level */
- TC, /* internal format */
- Tx->w, Tx->h, /* width, height */
- 0, /* border */
- Tx->format, /* texture format */
- GL_UNSIGNED_BYTE, /* texture type */
- Tx->data); /* the texture */
-
-
- v = 0;
- glGetTexLevelParameteriv(GL_TEXTURE_2D, 0,
- GL_TEXTURE_INTERNAL_FORMAT, &v);
- printf("Requested internal format = 0x%x, actual = 0x%x\n", TC, v);
-
- if (0) {
- GLint r, g, b, a, l, i;
- glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_RED_SIZE, &r);
- glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_GREEN_SIZE, &g);
- glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_BLUE_SIZE, &b);
- glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_ALPHA_SIZE, &a);
- glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_LUMINANCE_SIZE, &l);
- glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_INTENSITY_SIZE, &i);
- printf("Compressed Bits per R: %d G: %d B: %d A: %d L: %d I: %d\n",
- r, g, b, a, l, i);
- }
-
- /* okay, now cache the compressed texture */
- Tx->TC = TC;
- if (Tx->cData != NULL) {
- free(Tx->cData);
- Tx->cData = NULL;
- }
- glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_COMPRESSED_ARB, &rv);
- if (rv) {
- glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_INTERNAL_FORMAT, (GLint *)&Tx->cFormat);
- glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_COMPRESSED_IMAGE_SIZE_ARB, (GLint *)&Tx->cSize);
- if ((Tx->cData = malloc(Tx->cSize)) != NULL) {
- glGetCompressedTexImageARB(GL_TEXTURE_2D, 0, Tx->cData);
- }
- }
- }
-}
-
-
-static void Init( void )
-{
- /* HEIGHT * WIDTH + 1 (for trailing '\0') */
- static char pattern[8 * 32 + 1] = {"\
- \
- MMM EEEE SSS AAA \
- M M M E S S A A \
- M M M EEEE SS A A \
- M M M E SS AAAAA \
- M M E S S A A \
- M M EEEE SSS A A \
- "
- };
-
- GLuint i, j;
-
- GLubyte (*texture1)[8 * 32][4];
- GLubyte (*texture2)[256][256][4];
-
- t1.w = 32;
- t1.h = 8;
- t1.size = t1.w * t1.h * 4;
- t1.data = malloc(t1.size);
- t1.format = GL_RGBA;
- t1.TC = GL_RGBA;
-
- texture1 = (GLubyte (*)[8 * 32][4])t1.data;
- for (i = 0; i < sizeof(pattern) - 1; i++) {
- switch (pattern[i]) {
- default:
- case ' ':
- (*texture1)[i][0] = 255;
- (*texture1)[i][1] = 255;
- (*texture1)[i][2] = 255;
- (*texture1)[i][3] = 64;
- break;
- case 'M':
- (*texture1)[i][0] = 255;
- (*texture1)[i][1] = 0;
- (*texture1)[i][2] = 0;
- (*texture1)[i][3] = 255;
- break;
- case 'E':
- (*texture1)[i][0] = 0;
- (*texture1)[i][1] = 255;
- (*texture1)[i][2] = 0;
- (*texture1)[i][3] = 255;
- break;
- case 'S':
- (*texture1)[i][0] = 0;
- (*texture1)[i][1] = 0;
- (*texture1)[i][2] = 255;
- (*texture1)[i][3] = 255;
- break;
- case 'A':
- (*texture1)[i][0] = 255;
- (*texture1)[i][1] = 255;
- (*texture1)[i][2] = 0;
- (*texture1)[i][3] = 255;
- break;
- }
- }
-
- t2.w = 256;
- t2.h = 256;
- t2.size = t2.w * t2.h * 4;
- t2.data = malloc(t2.size);
- t2.format = GL_RGBA;
- t2.TC = GL_RGBA;
-
- texture2 = (GLubyte (*)[256][256][4])t2.data;
- for (j = 0; j < t2.h; j++) {
- for (i = 0; i < t2.w; i++) {
- (*texture2)[j][i][0] = sqrt(i * j * 255 * 255 / (t2.w * t2.h));
- (*texture2)[j][i][1] = 0;
- (*texture2)[j][i][2] = 0;
- (*texture2)[j][i][3] = 255;
- }
- }
-
- t3.data = LoadRGBImage(TEXTURE_FILE, (GLint *)&t3.w, (GLint *)&t3.h, &t3.format);
- t3.size = t3.w * t3.h * ((t3.format == GL_RGB) ? 3 : 4);
- t3.TC = GL_RGBA;
-
- ReInit(GL_RGBA, Tx = &t1);
-
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
- glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
- glEnable(GL_TEXTURE_2D);
-
- glEnable(GL_BLEND);
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-}
-
-
-static void Key( unsigned char key, int x, int y )
-{
- (void) x;
- (void) y;
- switch (key) {
- case 27:
- exit(0);
- break;
- case ' ':
- Anim = !Anim;
- if (Anim)
- glutIdleFunc( Idle );
- else
- glutIdleFunc( NULL );
- break;
- case 't':
- if (Tx == &t1) {
- Tx = &t2;
- } else if (Tx == &t2) {
- Tx = &t3;
- } else {
- Tx = &t1;
- }
- ReInit(Tx->TC, Tx);
- break;
- case '9':
- ReInit(GL_RGB, Tx);
- break;
- case '0':
- ReInit(GL_RGBA, Tx);
- break;
- case '1':
- ReInit(GL_COMPRESSED_RGB, Tx);
- break;
- case '2':
- ReInit(GL_COMPRESSED_RGBA, Tx);
- break;
- case '3':
- if (fxt1) ReInit(GL_COMPRESSED_RGB_FXT1_3DFX, Tx);
- break;
- case '4':
- if (fxt1) ReInit(GL_COMPRESSED_RGBA_FXT1_3DFX, Tx);
- break;
- case '5':
- if (dxtc) ReInit(GL_COMPRESSED_RGB_S3TC_DXT1_EXT, Tx);
- break;
- case '6':
- if (dxtc) ReInit(GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, Tx);
- break;
- case '7':
- if (dxtc) ReInit(GL_COMPRESSED_RGBA_S3TC_DXT3_EXT, Tx);
- break;
- case '8':
- if (dxtc) ReInit(GL_COMPRESSED_RGBA_S3TC_DXT5_EXT, Tx);
- break;
- case 'a':
- if (s3tc) ReInit(GL_RGB_S3TC, Tx);
- break;
- case 's':
- if (s3tc) ReInit(GL_RGB4_S3TC, Tx);
- break;
- case 'd':
- if (s3tc) ReInit(GL_RGBA_S3TC, Tx);
- break;
- case 'f':
- if (s3tc) ReInit(GL_RGBA4_S3TC, Tx);
- break;
- }
- glutPostRedisplay();
-}
-
-
-int main( int argc, char *argv[] )
-{
- float gl_version;
- GLint num_formats;
- GLint i;
- GLint formats[64];
-
-
- glutInit( &argc, argv );
- glutInitWindowPosition( 0, 0 );
- glutInitWindowSize( 400, 300 );
-
- glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
-
- if (glutCreateWindow(argv[0]) <= 0) {
- printf("Couldn't create window\n");
- exit(0);
- }
-
- glewInit();
- gl_version = atof( (const char *) glGetString( GL_VERSION ) );
- if ( (gl_version < 1.3)
- && !glutExtensionSupported("GL_ARB_texture_compression") ) {
- printf("Sorry, GL_ARB_texture_compression not supported\n");
- exit(0);
- }
- if (glutExtensionSupported("GL_3DFX_texture_compression_FXT1")) {
- fxt1 = GL_TRUE;
- }
- if (glutExtensionSupported("GL_EXT_texture_compression_s3tc")) {
- dxtc = GL_TRUE;
- }
- if (glutExtensionSupported("GL_S3_s3tc")) {
- s3tc = GL_TRUE;
- }
-
- glGetIntegerv( GL_NUM_COMPRESSED_TEXTURE_FORMATS_ARB, & num_formats );
-
- (void) memset( formats, 0, sizeof( formats ) );
- glGetIntegerv( GL_COMPRESSED_TEXTURE_FORMATS_ARB, formats );
-
- printf( "The following texture formats are supported:\n" );
- for ( i = 0 ; i < num_formats ; i++ ) {
- printf( "\t%s\n", TextureName( formats[i] ) );
- }
-
- Init();
-
- glutReshapeFunc( Reshape );
- glutKeyboardFunc( Key );
- glutDisplayFunc( Display );
- if (Anim)
- glutIdleFunc( Idle );
-
- glutMainLoop();
- return 0;
-}
projects / mesa.git / blobdiff