src/texture.c

   1 //
   2 // C Implementation: texture
   3 //
   4 // Description:
   5 //
   6 //
   7 // Author: Tobias Glaesser <tobi.web@gmx.de>, (C) 2004
   8 //
   9 // Copyright: See COPYING file that comes with this distribution
  10 //
  11 //
  12
  13 #include <SDL/SDL.h>
  14 #include <SDL/SDL_image.h>
  15 #include <SDL/SDL_opengl.h>
  16 #include "globals.h"
  17 #include "screen.h"
  18 #include "setup.h"
  19 #include "texture.h"
  20
  21 void texture_load(texture_type* ptexture, char * file, int use_alpha)
  22 {
  23   SDL_Surface * temp;
  24
  25   temp = IMG_Load(file);
  26
  27   if (temp == NULL)
  28     st_abort("Can't load", file);
  29
  30   ptexture->sdl_surface = SDL_DisplayFormatAlpha(temp);
  31
  32   if (ptexture->sdl_surface == NULL)
  33     st_abort("Can't covert to display format", file);
  34
  35   if (use_alpha == IGNORE_ALPHA)
  36     SDL_SetAlpha(ptexture->sdl_surface, 0, 0);
  37
  38   SDL_FreeSurface(temp);
  39
  40   ptexture->w = ptexture->sdl_surface->w;
  41   ptexture->h = ptexture->sdl_surface->h;
  42
  43   if(use_gl)
  44     {
  45       create_gl_texture(ptexture->sdl_surface,&ptexture->gl_texture);
  46     }
  47 }
  48
  49 void texture_from_sdl_surface(texture_type* ptexture, SDL_Surface* sdl_surf, int use_alpha)
  50 {
  51  /* SDL_Surface * temp;
  52
  53   temp = IMG_Load(file);
  54
  55   if (temp == NULL)
  56     st_abort("Can't load", file);*/
  57
  58   ptexture->sdl_surface = SDL_DisplayFormatAlpha(sdl_surf);
  59
  60   if (ptexture->sdl_surface == NULL)
  61     st_abort("Can't covert to display format", "SURFACE");
  62
  63   if (use_alpha == IGNORE_ALPHA)
  64     SDL_SetAlpha(ptexture->sdl_surface, 0, 0);
  65
  66   ptexture->w = ptexture->sdl_surface->w;
  67   ptexture->h = ptexture->sdl_surface->h;
  68
  69   if(use_gl)
  70     {
  71       create_gl_texture(ptexture->sdl_surface,&ptexture->gl_texture);
  72     }
  73 }
  74
  75 void texture_draw(texture_type* ptexture, float x, float y, int update)
  76 {
  77   if(use_gl)
  78     {
  79       glColor4ub(255, 255, 255,255);
  80       glBlendFunc (GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
  81       glEnable (GL_BLEND);
  82       glBindTexture(GL_TEXTURE_RECTANGLE_NV, ptexture->gl_texture);
  83
  84       glBegin(GL_QUADS);
  85       glTexCoord2f(0, 0);
  86       glVertex2f(x, y);
  87       glTexCoord2f((float)ptexture->w, 0);
  88       glVertex2f((float)ptexture->w+x, y);
  89       glTexCoord2f((float)ptexture->w, (float)ptexture->h);
  90       glVertex2f((float)ptexture->w+x, (float)ptexture->h+y);
  91       glTexCoord2f(0, (float)ptexture->h);
  92       glVertex2f(x, (float)ptexture->h+y);
  93       glEnd();
  94     }
  95   else
  96     {
  97       SDL_Rect dest;
  98
  99       dest.x = x;
 100       dest.y = y;
 101       dest.w = ptexture->w;
 102       dest.h = ptexture->h;
 103
 104       SDL_BlitSurface(ptexture->sdl_surface, NULL, screen, &dest);
 105
 106       if (update == UPDATE)
 107         SDL_UpdateRect(screen, dest.x, dest.y, dest.w, dest.h);
 108     }
 109 }
 110
 111 void texture_draw_bg(texture_type* ptexture, int update)
 112 {
 113 if(use_gl)
 114 {
 115     //glColor3ub(255, 255, 255);
 116
 117     glEnable(GL_TEXTURE_RECTANGLE_NV);
 118     glBindTexture(GL_TEXTURE_RECTANGLE_NV, ptexture->gl_texture);
 119
 120     glBegin(GL_QUADS);
 121         glTexCoord2f(0, 0);    glVertex2f(0, 0);
 122         glTexCoord2f((float)ptexture->w, 0);    glVertex2f(screen->w, 0);
 123         glTexCoord2f((float)ptexture->w, (float)ptexture->h);    glVertex2f(screen->w, screen->h);
 124         glTexCoord2f(0, (float)ptexture->h); glVertex2f(0, screen->h);
 125     glEnd();
 126
 127 }
 128 else
 129 {
 130   SDL_Rect dest;
 131
 132   dest.x = 0;
 133   dest.y = 0;
 134   dest.w = screen->w;
 135   dest.h = screen->h;
 136
 137   SDL_BlitSurface(ptexture->sdl_surface, NULL, screen, &dest);
 138
 139   if (update == UPDATE)
 140     SDL_UpdateRect(screen, dest.x, dest.y, dest.w, dest.h);
 141 }
 142 }
 143
 144 void texture_draw_part(texture_type* ptexture, float x, float y, float w, float h, int update)
 145 {
 146   if(use_gl)
 147     {
 148       glColor3ub(255, 255, 255);
 149
 150       glEnable(GL_TEXTURE_RECTANGLE_NV);
 151       glBindTexture(GL_TEXTURE_RECTANGLE_NV, ptexture->gl_texture);
 152
 153       glBegin(GL_QUADS);
 154       glTexCoord2f(x, y);
 155       glVertex2f(x, y);
 156       glTexCoord2f(x+w, y);
 157       glVertex2f(w+x, y);
 158       glTexCoord2f(x+w, y+h);
 159       glVertex2f(w+x, h+y);
 160       glTexCoord2f(x, y+h);
 161       glVertex2f(x, h+y);
 162       glEnd();
 163     }
 164   else
 165     {
 166       SDL_Rect src, dest;
 167
 168       src.x = x;
 169       src.y = y;
 170       src.w = w;
 171       src.h = h;
 172
 173       dest.x = x;
 174       dest.y = y;
 175       dest.w = w;
 176       dest.h = h;
 177
 178
 179       SDL_BlitSurface(ptexture->sdl_surface, &src, screen, &dest);
 180
 181       if (update == UPDATE)
 182         update_rect(screen, dest.x, dest.y, dest.w, dest.h);
 183     }
 184 }
 185
 186 void texture_free(texture_type* ptexture)
 187 {
 188   SDL_FreeSurface(ptexture->sdl_surface);
 189   if(use_gl)
 190     glDeleteTextures(1, &ptexture->gl_texture);
 191 }
 192