vg/vg_tex.h

   1 // Copyright (C) 2021 Harry Godden (hgn) - All Rights Reserved
   2
   3 static inline void vg_tex2d_mipmap(void)
   4 {
   5         glGenerateMipmap( GL_TEXTURE_2D );
   6 }
   7
   8 static inline void vg_tex2d_linear(void)
   9 {
  10         glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
  11         glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
  12 }
  13
  14 static inline void vg_tex2d_nearest(void)
  15 {
  16         glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
  17         glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
  18 }
  19
  20 static inline void vg_tex2d_linear_mipmap(void)
  21 {
  22         glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );
  23         glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
  24 }
  25
  26 static inline void vg_tex2d_repeat(void)
  27 {
  28         glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
  29         glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
  30 }
  31
  32 static inline void vg_tex2d_clamp(void)
  33 {
  34         glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
  35         glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
  36 }
  37
  38 static GLuint vg_tex2d_rgba( const char *path )
  39 {
  40         int x,y,nc;
  41         stbi_set_flip_vertically_on_load( 0 );
  42
  43         i64 length;
  44         u8 *src_data = vg_asset_read_s( path, &length );
  45
  46         GLuint texture_name;
  47         glGenTextures( 1, &texture_name );
  48         glBindTexture( GL_TEXTURE_2D, texture_name );
  49
  50         if( src_data )
  51         {
  52                 u8 *tex_buffer = stbi_load_from_memory( src_data, length, &x, &y, &nc, 4 );
  53                 glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, tex_buffer );
  54
  55                 free( tex_buffer );
  56                 free( src_data );
  57         }
  58         else
  59         {
  60                 u32 tex_err[4] =
  61                 {
  62                         0xffff00ff,
  63                         0xff000000,
  64                         0xff000000,
  65                         0xffff00ff
  66                 };
  67
  68                 vg_error( "Loading texture failed (%s)\n", path );
  69                 glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, tex_err );
  70         }
  71
  72         return texture_name;
  73 }