intravenous

annotate src/tex.c @ 3:94d4c60af435

find changesets by author, revision, files, or words in the commit message
some progress
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 22 Apr 2012 03:35:18 +0300
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nuclear@3 1 #include <imago2.h>
nuclear@3 2 #include "opengl.h"
nuclear@3 3
nuclear@3 4 static void bind_common(GLenum type, unsigned int tex, int tex_unit);
nuclear@3 5
nuclear@3 6 unsigned int load_texture(const char *fname)
nuclear@3 7 {
nuclear@3 8 unsigned int tex;
nuclear@3 9 struct img_pixmap img;
nuclear@3 10 int intfmt, fmt, type;
nuclear@3 11
nuclear@3 12 img_init(&img);
nuclear@3 13 if(img_load(&img, fname) == -1) {
nuclear@3 14 fprintf(stderr, "failed to load texture: %s\n", fname);
nuclear@3 15 return 0;
nuclear@3 16 }
nuclear@3 17 intfmt = img_glintfmt(&img);
nuclear@3 18 fmt = img_glfmt(&img);
nuclear@3 19 type = img_gltype(&img);
nuclear@3 20
nuclear@3 21 glGenTextures(1, &tex);
nuclear@3 22 glBindTexture(GL_TEXTURE_2D, tex);
nuclear@3 23 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@3 24 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@3 25 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
nuclear@3 26 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
nuclear@3 27 glTexImage2D(GL_TEXTURE_2D, 0, intfmt, img.width, img.height, 0, fmt, type, img.pixels);
nuclear@3 28 img_destroy(&img);
nuclear@3 29 return tex;
nuclear@3 30 }
nuclear@3 31
nuclear@3 32 unsigned int load_texture_cube(const char *fname)
nuclear@3 33 {
nuclear@3 34 /* TODO implement */
nuclear@3 35 return 0;
nuclear@3 36 }
nuclear@3 37
nuclear@3 38 void free_texture(unsigned int tex)
nuclear@3 39 {
nuclear@3 40 if(tex && glIsTexture(tex)) {
nuclear@3 41 glDeleteTextures(1, &tex);
nuclear@3 42 }
nuclear@3 43 }
nuclear@3 44
nuclear@3 45 void bind_texture(unsigned int tex, int tex_unit)
nuclear@3 46 {
nuclear@3 47 bind_common(GL_TEXTURE_2D, tex, tex_unit);
nuclear@3 48 }
nuclear@3 49
nuclear@3 50 void bind_texture_cube(unsigned int tex, int tex_unit)
nuclear@3 51 {
nuclear@3 52 bind_common(GL_TEXTURE_CUBE_MAP, tex, tex_unit);
nuclear@3 53 }
nuclear@3 54
nuclear@3 55 static void bind_common(GLenum type, unsigned int tex, int tex_unit)
nuclear@3 56 {
nuclear@3 57 glActiveTextureARB(GL_TEXTURE0 + (GLenum)tex_unit);
nuclear@3 58 if(tex) {
nuclear@3 59 glBindTexture(type, tex);
nuclear@3 60 glEnable(type);
nuclear@3 61 } else {
nuclear@3 62 glDisable(type);
nuclear@3 63 }
nuclear@3 64 glActiveTextureARB(GL_TEXTURE0);
nuclear@3 65 }