Mercurial > hg > Members > kono > Cerium
annotate Renderer/Engine/texture.cc @ 927:651251d56f36
remove garbage codes from viewerGL
| author | koba <koba@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Fri, 30 Jul 2010 17:57:49 +0900 |
| parents | 735f76483bb2 |
| children |
| rev | line source |
|---|---|
| 507 | 1 #include <iostream> |
| 2 #include <SDL.h> | |
| 3 #include <SDL_opengl.h> | |
| 4 #include <SDL_image.h> | |
| 5 #include <libxml/parser.h> | |
| 6 using namespace std; | |
| 7 | |
| 8 int power_of_two(int input) | |
| 9 { | |
| 10 int value = 1; | |
| 11 | |
| 12 while ( value < input ) | |
| 13 { | |
| 14 value <<= 1; | |
| 15 } | |
| 16 return value; | |
| 17 } | |
| 18 | |
|
927
651251d56f36
remove garbage codes from viewerGL
koba <koba@cr.ie.u-ryukyu.ac.jp>
parents:
507
diff
changeset
|
19 GLuint SDL_GL_LoadTexture(SDL_Surface *surface) |
| 507 | 20 { |
| 21 GLuint texture; | |
|
927
651251d56f36
remove garbage codes from viewerGL
koba <koba@cr.ie.u-ryukyu.ac.jp>
parents:
507
diff
changeset
|
22 GLfloat texcoord[4]; |
| 507 | 23 int w, h; |
| 24 SDL_Surface *image; | |
| 25 SDL_Rect area; | |
| 26 Uint32 saved_flags; | |
| 27 Uint8 saved_alpha; | |
| 28 | |
| 29 /* Use the surface width and height expanded to powers of 2 */ | |
| 30 w = power_of_two(surface->w); | |
| 31 h = power_of_two(surface->h); | |
| 32 texcoord[0] = 0.0f; /* Min X */ | |
| 33 texcoord[1] = 0.0f; /* Min Y */ | |
| 34 texcoord[2] = (GLfloat)surface->w / w; /* Max X */ | |
| 35 texcoord[3] = (GLfloat)surface->h / h; /* Max Y */ | |
| 36 | |
| 37 image = SDL_CreateRGBSurface( | |
| 38 SDL_SWSURFACE, | |
| 39 w, h, | |
| 40 32, | |
| 41 #if SDL_BYTEORDER == SDL_LIL_ENDIAN /* OpenGL RGBA masks */ | |
| 42 0x000000FF, | |
| 43 0x0000FF00, | |
| 44 0x00FF0000, | |
| 45 0xFF000000 | |
| 46 #else | |
| 47 0xFF000000, | |
| 48 0x00FF0000, | |
| 49 0x0000FF00, | |
| 50 0x000000FF | |
| 51 #endif | |
| 52 ); | |
| 53 if ( image == NULL ) | |
| 54 { | |
| 55 return 0; | |
| 56 } | |
| 57 | |
| 58 /* Save the alpha blending attributes */ | |
| 59 saved_flags = surface->flags&(SDL_SRCALPHA|SDL_RLEACCELOK); | |
| 60 saved_alpha = surface->format->alpha; | |
| 61 if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) | |
| 62 { | |
| 63 SDL_SetAlpha(surface, 0, 0); | |
| 64 } | |
| 65 /* Copy the surface into the GL texture image */ | |
| 66 area.x = 0; | |
| 67 area.y = 0; | |
| 68 area.w = surface->w; | |
| 69 area.h = surface->h; | |
| 70 SDL_BlitSurface(surface, &area, image, &area); | |
| 71 | |
| 72 /* Restore the alpha blending attributes */ | |
| 73 if ( (saved_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) | |
| 74 { | |
| 75 SDL_SetAlpha(surface, saved_flags, saved_alpha); | |
| 76 } | |
| 77 | |
| 78 /* Create an OpenGL texture for the image */ | |
| 79 glGenTextures(1, &texture); | |
| 80 glBindTexture(GL_TEXTURE_2D, texture); | |
| 81 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); | |
| 82 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); | |
| 83 glTexImage2D(GL_TEXTURE_2D, | |
| 84 0, | |
| 85 GL_RGBA, | |
| 86 w, h, | |
| 87 0, | |
| 88 GL_RGBA, | |
| 89 GL_UNSIGNED_BYTE, | |
| 90 image->pixels); | |
| 91 SDL_FreeSurface(image); /* No longer needed */ | |
| 92 | |
| 93 return texture; | |
| 94 } |