+++ /dev/null
-/*
- * Test texture compression.
- */
-
-
-#include <assert.h>
-#include <stdio.h>
-#include <GL/glew.h>
-#include <GL/glut.h>
-#include "readtex.c"
-
-#define IMAGE_FILE "../images/arch.rgb"
-
-static int ImgWidth, ImgHeight;
-static GLenum ImgFormat;
-static GLenum CompFormat;
-static GLfloat EyeDist = 5.0;
-static GLfloat Rot = 0.0;
-const GLenum Target = GL_TEXTURE_2D;
-
-
-static void
-CheckError(int line)
-{
- GLenum err = glGetError();
- if (err) {
- printf("GL Error %d at line %d\n", (int) err, line);
- }
-}
-
-
-static const char *
-LookupFormat(GLenum format)
-{
- switch (format) {
- 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";
- default:
- return "other";
- }
-}
-
-
-static void
-TestSubTex(void)
-{
- GLboolean all = 0*GL_TRUE;
- GLubyte *buffer;
- GLint size, fmt;
-
- glGetTexLevelParameteriv(Target, 0,
- GL_TEXTURE_COMPRESSED_IMAGE_SIZE_ARB, &size);
- glGetTexLevelParameteriv(Target, 0, GL_TEXTURE_INTERNAL_FORMAT, &fmt);
-
- buffer = (GLubyte *) malloc(size);
- glGetCompressedTexImageARB(Target, 0, buffer);
-
- printf("Testing sub-texture replacement\n");
- if (all)
- glCompressedTexImage2DARB(Target, 0,
- fmt, ImgWidth, ImgHeight, 0,
- size, buffer);
- else {
- /* bottom half */
- glCompressedTexSubImage2DARB(Target, 0,
- 0, 0, /* pos */
- ImgWidth, ImgHeight / 2,
- fmt, size/2, buffer);
- /* top half */
- glCompressedTexSubImage2DARB(Target, 0,
- 0, ImgHeight / 2, /* pos */
- ImgWidth, ImgHeight / 2,
- fmt, size/2, buffer + size / 2);
- }
-
- free(buffer);
-}
-
-
-static void
-TestGetTex(void)
-{
- GLubyte *buffer;
-
- buffer = (GLubyte *) malloc(3 * ImgWidth * ImgHeight);
-
- glGetTexImage(GL_TEXTURE_2D,
- 0,
- GL_RGB,
- GL_UNSIGNED_BYTE,
- buffer);
-
- free(buffer);
-}
-
-
-static void
-LoadCompressedImage(const char *file)
-{
- const GLenum filter = GL_LINEAR;
- GLubyte *image;
- GLint p;
-
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
- glPixelStorei(GL_PACK_ALIGNMENT, 1);
-
- /*
- * Load image and scale if needed.
- */
- image = LoadRGBImage( file, &ImgWidth, &ImgHeight, &ImgFormat );
- if (!image) {
- printf("Couldn't read %s\n", IMAGE_FILE);
- exit(0);
- }
- printf("Image is %d x %d\n", ImgWidth, ImgHeight);
-
- /* power of two */
- assert(ImgWidth == 128 || ImgWidth == 256 || ImgWidth == 512);
- assert(ImgWidth == 128 || ImgHeight == 256 || ImgHeight == 512);
-
- if (ImgFormat == GL_RGB)
- CompFormat = GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
- else
- CompFormat = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
-
- if (ImgFormat == GL_RGBA) {
- int i, numAlpha = 0;
- for (i = 0; i < ImgWidth * ImgHeight; i++) {
- if (image[i*4+3] != 0 && image[i*4+3] != 0xff) {
- numAlpha++;
- }
- if (image[i*4+3] == 0)
- image[i*4+3] = 4 * i / ImgWidth;
- }
- printf("Num Alpha !=0,255: %d\n", numAlpha);
- }
-
- CompFormat = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
-
-
- /*
- * Give image to OpenGL and have it compress it.
- */
- glTexImage2D(Target, 0, CompFormat, ImgWidth, ImgHeight, 0,
- ImgFormat, GL_UNSIGNED_BYTE, image);
- CheckError(__LINE__);
-
- free(image);
-
- glGetTexLevelParameteriv(Target, 0, GL_TEXTURE_INTERNAL_FORMAT, &p);
- printf("Compressed Internal Format: %s (0x%x)\n", LookupFormat(p), p);
- assert(p == CompFormat);
-
- printf("Original size: %d bytes\n", ImgWidth * ImgHeight * 3);
- glGetTexLevelParameteriv(Target, 0, GL_TEXTURE_COMPRESSED_IMAGE_SIZE_ARB, &p);
- printf("Compressed size: %d bytes\n", p);
-
- glTexParameteri(Target, GL_TEXTURE_MIN_FILTER, filter);
- glTexParameteri(Target, GL_TEXTURE_MAG_FILTER, filter);
-
- if (0)
- TestSubTex();
- else
- TestGetTex();
-
-}
-
-
-static void
-Init(const char *file)
-{
- GLint numFormats, formats[100];
- GLint p;
-
- if (!glutExtensionSupported("GL_ARB_texture_compression")) {
- printf("Sorry, GL_ARB_texture_compression is required.\n");
- exit(1);
- }
- if (!glutExtensionSupported("GL_EXT_texture_compression_s3tc")) {
- printf("Sorry, GL_EXT_texture_compression_s3tc is required.\n");
- exit(1);
- }
-
- printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
- printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
-
- glGetIntegerv(GL_NUM_COMPRESSED_TEXTURE_FORMATS_ARB, &numFormats);
- glGetIntegerv(GL_COMPRESSED_TEXTURE_FORMATS_ARB, formats);
- printf("%d supported compression formats: ", numFormats);
- for (p = 0; p < numFormats; p++)
- printf("0x%x ", formats[p]);
- printf("\n");
-
- LoadCompressedImage(file);
-
- glEnable(GL_TEXTURE_2D);
-
- if (ImgFormat == GL_RGBA) {
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- glEnable(GL_BLEND);
- }
-}
-
-
-static void
-Reshape( int width, int height )
-{
- glViewport( 0, 0, width, height );
- glMatrixMode( GL_PROJECTION );
- glLoadIdentity();
- glFrustum(-1, 1, -1, 1, 4, 100);
- glMatrixMode( GL_MODELVIEW );
- glLoadIdentity();
-}
-
-
-static void
-Key( unsigned char key, int x, int y )
-{
- (void) x;
- (void) y;
- switch (key) {
- case 'd':
- EyeDist -= 1.0;
- if (EyeDist < 4.0)
- EyeDist = 4.0;
- break;
- case 'D':
- EyeDist += 1.0;
- break;
- case 'z':
- Rot += 5.0;
- break;
- case 'Z':
- Rot -= 5.0;
- break;
- case 27:
- exit(0);
- break;
- }
- glutPostRedisplay();
-}
-
-
-static void
-Draw( void )
-{
- glClearColor(0.3, 0.3, .8, 0);
- glClear(GL_COLOR_BUFFER_BIT);
-
- glPushMatrix();
- glTranslatef(0, 0, -(EyeDist+0.01));
- glRotatef(Rot, 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();
-}
-
-
-int
-main( int argc, char *argv[] )
-{
- glutInit( &argc, argv );
- glutInitWindowSize( 600, 600 );
-
- glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE);
-
- glutCreateWindow(argv[0]);
- glewInit();
-
- glutReshapeFunc( Reshape );
- glutKeyboardFunc( Key );
- glutDisplayFunc( Draw );
-
- if (argc > 1)
- Init(argv[1]);
- else
- Init(IMAGE_FILE);
-
- glutMainLoop();
- return 0;
-}
projects / mesa.git / blobdiff