git.mutantstargoat.com Git - demo/blob - src/opengl/texture-gl.cc

   1 #include <GL/glew.h>
   2
   3 #include "texture.h"
   4 #include "opengl/texture-gl.h"
   5
   6 TextureGL::TextureGL()
   7 {
   8         tex = 0;
   9         target = GL_TEXTURE_2D;
  10 }
  11
  12 TextureGL::~TextureGL()
  13 {
  14         glDeleteTextures(1, &tex);
  15 }
  16
  17 void TextureGL::update()
  18 {
  19         if(images.empty())
  20                 return;
  21
  22         if(!tex) {
  23                 target = is_cubemap() ? GL_TEXTURE_CUBE_MAP : GL_TEXTURE_2D;
  24
  25                 glGenTextures(1, &tex);
  26                 glBindTexture(target, tex);
  27                 glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
  28                 glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  29         }
  30         else {
  31                 glBindTexture(target, tex);
  32         }
  33
  34         static const unsigned int faces[] = {
  35                 GL_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_POSITIVE_Y, GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
  36                 GL_TEXTURE_CUBE_MAP_NEGATIVE_X, GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z
  37         };
  38
  39         for(size_t i=0; i<images.size(); i++) {
  40                 int w = images[i].w;
  41                 int h = images[i].h;
  42
  43                 unsigned char *pixels = images[i].pixels;
  44                 unsigned int t = is_cubemap() ? faces[i] : GL_TEXTURE_2D;
  45                 glTexImage2D(t, 0, GL_SRGB_ALPHA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
  46         }
  47
  48         glGenerateMipmap(target);
  49 }
  50
  51 void TextureGL::bind()
  52 {
  53         glBindTexture(GL_TEXTURE_2D, tex);
  54 }