diff options
Diffstat (limited to 'progs/demos')
| -rw-r--r-- | progs/demos/textures.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/progs/demos/textures.c b/progs/demos/textures.c index 1415ef1c43..b668995aac 100644 --- a/progs/demos/textures.c +++ b/progs/demos/textures.c @@ -6,11 +6,13 @@ #include <stdio.h> #include <stdlib.h> #include <math.h> +#include <GL/glew.h> #include <GL/glut.h> #include "readtex.h" #define TEST_CLAMP 0 #define TEST_MIPMAPS 0 +#define TEST_GEN_COMPRESSED_MIPMAPS 0 #define MAX_TEXTURES 8 @@ -304,6 +306,69 @@ LoadTextures(GLuint n, const char *files[]) GL_RGBA, GL_UNSIGNED_BYTE, image); } } +#elif TEST_GEN_COMPRESSED_MIPMAPS + { + GLenum intFormat = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT; + int f; + GLenum format; + GLubyte *img = LoadRGBImage(files[i], &w, &h, &format); + GLboolean write_compressed = GL_FALSE; + GLboolean read_compressed = GL_FALSE; + + glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE); + glTexImage2D(GL_TEXTURE_2D, 0, intFormat, w, h, 0, + format, GL_UNSIGNED_BYTE, img); + glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_FALSE); + free(img); + + glGetTexLevelParameteriv(GL_TEXTURE_2D, i, + GL_TEXTURE_INTERNAL_FORMAT, &f); + printf("actual internal format 0x%x\n", f); + + if (write_compressed) { + GLint i, sz, w, h; + int num_levels = 8; + for (i = 0; i < num_levels; i++) { + char name[20], *buf; + FILE *f; + glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_WIDTH, &w); + glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_HEIGHT, &h); + glGetTexLevelParameteriv(GL_TEXTURE_2D, i, + GL_TEXTURE_COMPRESSED_IMAGE_SIZE, &sz); + printf("Writing level %d: %d x %d bytes: %d\n", i, w, h, sz); + buf = malloc(sz); + glGetCompressedTexImageARB(GL_TEXTURE_2D, i, buf); + sprintf(name, "comp%d", i); + f = fopen(name, "w"); + fwrite(buf, 1, sz, f); + fclose(f); + free(buf); + } + } + + if (read_compressed) { + GLint i, sz, w, h; + int num_levels = 8; + for (i = 01; i < num_levels; i++) { + char name[20], *buf; + FILE *f; + glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_WIDTH, &w); + glGetTexLevelParameteriv(GL_TEXTURE_2D, i, GL_TEXTURE_HEIGHT, &h); + glGetTexLevelParameteriv(GL_TEXTURE_2D, i, + GL_TEXTURE_COMPRESSED_IMAGE_SIZE, &sz); + buf = malloc(sz); + sprintf(name, "comp%d", i); + printf("Reading level %d: %d x %d bytes: %d from %s\n", + i, w, h, sz, name); + f = fopen(name, "r"); + fread(buf, 1, sz, f); + fclose(f); + glCompressedTexImage2DARB(GL_TEXTURE_2D, i, intFormat, + w, h, 0, sz, buf); + free(buf); + } + } + } #else if (!LoadRGBMipmaps2(files[i], GL_TEXTURE_2D, GL_RGB, &w, &h)) { printf("Error: couldn't load %s\n", files[i]); @@ -360,6 +425,7 @@ main(int argc, char *argv[]) glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); Win = glutCreateWindow(argv[0]); + glewInit(); glutReshapeFunc(Reshape); glutKeyboardFunc(Key); glutSpecialFunc(SpecialKey); |