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annotate src/texture.c @ 7:b557812c45db

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generating the android (ant) project stuff from the makefile
author John Tsiombikas <nuclear@member.fsf.org>
date Mon, 04 May 2015 02:46:35 +0300
parents 8ba79034e8a6
children
rev   line source
nuclear@0 1 #include <stdio.h>
nuclear@0 2 #include "texture.h"
nuclear@0 3 #include "image.h"
nuclear@0 4 #include "opengl.h"
nuclear@0 5
nuclear@0 6 #ifndef GL_GENERATE_MIPMAP_SGIS
nuclear@0 7 #define GL_GENERATE_MIPMAP_SGIS 0x8191
nuclear@0 8 #endif
nuclear@0 9
nuclear@5 10 static unsigned int default_texture(void);
nuclear@5 11
nuclear@0 12 unsigned int load_texture(const char *fname)
nuclear@0 13 {
nuclear@0 14 unsigned int tex;
nuclear@0 15 struct image *img;
nuclear@0 16
nuclear@0 17 if(!(img = load_image(fname))) {
nuclear@0 18 fprintf(stderr, "failed to load image: %s\n", fname);
nuclear@5 19 return default_texture();
nuclear@0 20 }
nuclear@0 21
nuclear@0 22 glGenTextures(1, &tex);
nuclear@0 23 glBindTexture(GL_TEXTURE_2D, tex);
nuclear@0 24 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
nuclear@0 25 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@0 26 glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
nuclear@0 27 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img->width, img->height, 0, GL_RGB, GL_UNSIGNED_BYTE, img->pixels);
nuclear@0 28 free_image(img);
nuclear@0 29 return tex;
nuclear@0 30 }
nuclear@5 31
nuclear@5 32 #define DEF_TEX_SZ 64
nuclear@5 33
nuclear@5 34 static unsigned int default_texture(void)
nuclear@5 35 {
nuclear@5 36 static unsigned int tex;
nuclear@5 37 static unsigned char pixels[DEF_TEX_SZ * DEF_TEX_SZ * 3];
nuclear@5 38
nuclear@5 39 if(!tex) {
nuclear@5 40 /* generate it */
nuclear@5 41 int i, j;
nuclear@5 42 unsigned char *pptr = pixels;
nuclear@5 43
nuclear@5 44 for(i=0; i<DEF_TEX_SZ; i++) {
nuclear@5 45 for(j=0; j<DEF_TEX_SZ; j++) {
nuclear@5 46 int c = ((i >> 3) & 1) == ((j >> 3) & 1);
nuclear@5 47
nuclear@5 48 *pptr++ = c ? 255 : 64;
nuclear@5 49 *pptr++ = 100;
nuclear@5 50 *pptr++ = c ? 64 : 255;
nuclear@5 51 }
nuclear@5 52 }
nuclear@5 53
nuclear@5 54 glGenTextures(1, &tex);
nuclear@5 55 glBindTexture(GL_TEXTURE_2D, tex);
nuclear@5 56 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
nuclear@5 57 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@5 58 glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
nuclear@5 59 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, DEF_TEX_SZ, DEF_TEX_SZ, 0, GL_RGB, GL_UNSIGNED_BYTE, pixels);
nuclear@5 60 }
nuclear@5 61
nuclear@5 62 return tex;
nuclear@5 63 }