guicast/bctexture.C

   1 #define GL_GLEXT_PROTOTYPES
   2
   3 #include "bcsynchronous.h"
   4 #include "bctexture.h"
   5 #include "bcwindowbase.h"
   6 #include "colormodels.h"
   7
   8
   9 BC_Texture::BC_Texture(int w, int h, int colormodel)
  10 {
  11         this->w = w;
  12         this->h = h;
  13         this->colormodel = colormodel;
  14         texture_id = -1;
  15         texture_id = -1;
  16         texture_w = 0;
  17         texture_h = 0;
  18         texture_components = 0;
  19         window_id = -1;
  20         create_texture(w, h, colormodel);
  21 }
  22
  23
  24 BC_Texture::~BC_Texture()
  25 {
  26         clear_objects();
  27 }
  28
  29 void BC_Texture::clear_objects()
  30 {
  31         if(get_texture_id() >= 0)
  32         {
  33 // printf("VFrame::clear_objects %p window_id=%d texture_id=%d w=%d h=%d\n",
  34 // this, window_id, texture_id, texture_w, texture_h);
  35                 BC_WindowBase::get_synchronous()->release_texture(
  36                         window_id,
  37                         texture_id);
  38                 texture_id = -1;
  39         }
  40 }
  41
  42 void BC_Texture::new_texture(BC_Texture **texture,
  43         int w,
  44         int h,
  45         int colormodel)
  46 {
  47         if(!(*texture))
  48         {
  49                 (*texture) = new BC_Texture(w, h, colormodel);
  50         }
  51         else
  52         {
  53                 (*texture)->create_texture(w, h, colormodel);
  54         }
  55 }
  56
  57 void BC_Texture::create_texture(int w, int h, int colormodel)
  58 {
  59 #ifdef HAVE_GL
  60
  61 // Get max texture size from the server.
  62 // Maximum size was 4096 on the earliest cards that could do video.
  63         int max_texture_size = 0;
  64         glGetIntegerv(GL_MAX_TEXTURE_SIZE, &max_texture_size);
  65
  66 // Calculate dimensions of texture
  67         int new_w = calculate_texture_size(w, &max_texture_size);
  68         int new_h = calculate_texture_size(h, &max_texture_size);
  69         int new_components = cmodel_components(colormodel);
  70
  71
  72         if(new_w < w || new_h < h)
  73         {
  74                 printf("BC_Texture::create_texture frame size %dx%d bigger than maximum texture %dx%d.\n",
  75                         w,
  76                         h,
  77                         max_texture_size,
  78                         max_texture_size);
  79         }
  80
  81 // Delete existing texture
  82         if(texture_id >= 0 &&
  83                 (new_h != texture_h ||
  84                 new_w != texture_w ||
  85                 new_components != texture_components ||
  86                 BC_WindowBase::get_synchronous()->current_window->get_id() != window_id))
  87         {
  88 // printf("BC_Texture::create_texture released window_id=%d texture_id=%d\n",
  89 // BC_WindowBase::get_synchronous()->current_window->get_id(),
  90 // texture_id);
  91                 BC_WindowBase::get_synchronous()->release_texture(
  92                         window_id,
  93                         texture_id);
  94             texture_id = -1;
  95             window_id = -1;
  96         }
  97
  98
  99         texture_w = new_w;
 100         texture_h = new_h;
 101         texture_components = new_components;
 102
 103 // Get matching texture
 104         if(texture_id < 0)
 105         {
 106                 texture_id = BC_WindowBase::get_synchronous()->get_texture(
 107                         texture_w,
 108                         texture_h,
 109                         texture_components);
 110 // A new VFrame has no window_id, so it must read it from the matching texture.
 111                 if(texture_id >= 0)
 112                         window_id = BC_WindowBase::get_synchronous()->current_window->get_id();
 113         }
 114
 115
 116 // No matching texture exists.
 117 // Create new texture with the proper dimensions
 118         if(texture_id < 0)
 119         {
 120                 glGenTextures(1, (GLuint*)&texture_id);
 121                 glBindTexture(GL_TEXTURE_2D, (GLuint)texture_id);
 122                 glEnable(GL_TEXTURE_2D);
 123                 if(texture_components == 4)
 124                         glTexImage2D(GL_TEXTURE_2D,
 125                                 0,
 126                                 4,
 127                                 texture_w,
 128                         texture_h,
 129                                 0,
 130                                 GL_RGBA,
 131                                 GL_UNSIGNED_BYTE,
 132                         0);
 133                 else
 134                         glTexImage2D(GL_TEXTURE_2D,
 135                                 0,
 136                                 3,
 137                                 texture_w,
 138                         texture_h,
 139                                 0,
 140                                 GL_RGB,
 141                                 GL_UNSIGNED_BYTE,
 142                         0);
 143
 144                 window_id = BC_WindowBase::get_synchronous()->current_window->get_id();
 145                 BC_WindowBase::get_synchronous()->put_texture(texture_id,
 146                         texture_w,
 147                         texture_h,
 148                         texture_components);
 149 // printf("VFrame::new_texture created texture_id=%d window_id=%d\n",
 150 // *texture_id,
 151 // *window_id);
 152         }
 153         else
 154         {
 155                 glBindTexture(GL_TEXTURE_2D, (GLuint)texture_id);
 156                 glEnable(GL_TEXTURE_2D);
 157         }
 158 #endif
 159 }
 160
 161 int BC_Texture::calculate_texture_size(int w, int *max)
 162 {
 163         int i;
 164         for(i = 2; (max && i <= *max) || (!max && i < w); i *= 2)
 165         {
 166                 if(i >= w)
 167                 {
 168                         return i;
 169                         break;
 170                 }
 171         }
 172         if(max && i > *max) return 16;
 173         return i;
 174 }
 175
 176 int BC_Texture::get_texture_id()
 177 {
 178         return texture_id;
 179 }
 180
 181 int BC_Texture::get_texture_w()
 182 {
 183         return texture_w;
 184 }
 185
 186 int BC_Texture::get_texture_h()
 187 {
 188         return texture_h;
 189 }
 190
 191 int BC_Texture::get_texture_components()
 192 {
 193         return texture_components;
 194 }
 195
 196 int BC_Texture::get_window_id()
 197 {
 198         return window_id;
 199 }
 200
 201
 202 void BC_Texture::bind(int texture_unit)
 203 {
 204 #ifdef HAVE_GL
 205 // Bind the texture
 206         if(texture_id >= 0)
 207         {
 208                 if(texture_unit >= 0) glActiveTexture(GL_TEXTURE0 + texture_unit);
 209                 glBindTexture(GL_TEXTURE_2D, texture_id);
 210                 glEnable(GL_TEXTURE_2D);
 211                 if(texture_unit >= 0)
 212                 {
 213                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 214                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 215
 216 // GL_REPEAT in this case causes the upper left corners of the masks
 217 // to blur.
 218                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
 219                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
 220
 221 // Get the texture to alpha blend
 222                         glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
 223                 }
 224         }
 225 #endif
 226 }
 227