Rev 5 | Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4 | tom | 1 | #include "SDL/SDL_image.h" |
| 2 | #include "SDL/SDL_opengl.h" |
||
| 3 | |||
| 4 | #include <iostream> |
||
| 5 | |||
| 6 | using namespace std; |
||
| 7 | |||
| 8 | #include "texture.hpp" |
||
| 9 | |||
| 10 | Texture::Texture(string filename) |
||
| 11 | { |
||
| 12 | loaded = false; |
||
| 13 | |||
| 14 | GLenum textureFormat = GL_RGB; |
||
| 15 | |||
| 16 | SDL_Surface *surface = IMG_Load(filename.c_str()); |
||
| 17 | if (surface) |
||
| 18 | { |
||
| 19 | GLint noOfColours = surface->format->BytesPerPixel; |
||
| 20 | if (noOfColours == 4) |
||
| 21 | { |
||
| 22 | if (surface->format->Rmask == 0x000000ff) |
||
| 23 | { |
||
| 24 | textureFormat = GL_RGBA; |
||
| 25 | } |
||
| 26 | else |
||
| 27 | { |
||
| 28 | textureFormat = GL_BGRA; |
||
| 29 | } |
||
| 30 | } |
||
| 31 | else if (noOfColours == 3) |
||
| 32 | { |
||
| 33 | if (surface->format->Rmask == 0x000000ff) |
||
| 34 | { |
||
| 35 | textureFormat = GL_RGB; |
||
| 36 | } |
||
| 37 | else |
||
| 38 | { |
||
| 39 | textureFormat = GL_BGR; |
||
| 40 | } |
||
| 41 | } |
||
| 42 | else |
||
| 43 | { |
||
| 44 | // Big Problem! |
||
| 45 | } |
||
| 46 | |||
| 47 | glGenTextures(1, &texture); |
||
| 48 | |||
| 49 | glBindTexture(GL_TEXTURE_2D, texture); |
||
| 50 | |||
| 51 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
||
| 52 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
||
| 53 | |||
| 54 | width = surface->w; |
||
| 55 | height = surface->h; |
||
| 56 | halfWidth = width * 0.5; |
||
| 57 | halfHeight = height * 0.5; |
||
| 58 | |||
| 59 | glTexImage2D(GL_TEXTURE_2D, 0, noOfColours, width, height, 0, textureFormat, GL_UNSIGNED_BYTE, surface->pixels); |
||
| 60 | |||
| 61 | SDL_FreeSurface(surface); |
||
| 62 | |||
| 63 | loaded = true; |
||
| 64 | } |
||
| 65 | } |
||
| 66 | |||
| 67 | Texture::~Texture() |
||
| 68 | { |
||
| 69 | if (loaded) |
||
| 70 | { |
||
| 71 | glDeleteTextures(1, &texture); |
||
| 72 | } |
||
| 73 | } |
||
| 74 | |||
| 75 | void Texture::draw(int x, int y) |
||
| 76 | { |
||
| 77 | if (loaded) |
||
| 78 | { |
||
| 79 | glBindTexture(GL_TEXTURE_2D, texture); |
||
| 80 | |||
| 81 | int x1 = x - halfWidth; |
||
| 82 | int x2 = x + halfWidth; |
||
| 83 | int y1 = y - halfHeight; |
||
| 84 | int y2 = y + halfHeight; |
||
| 85 | |||
| 86 | glBegin(GL_QUADS); |
||
| 87 | //Bottom-left vertex (corner) |
||
| 88 | glTexCoord2i(0, 0); |
||
| 89 | glVertex3f(x1, y2, 0.0f); |
||
| 90 | |||
| 91 | //Bottom-right vertex (corner) |
||
| 92 | glTexCoord2i(1, 0); |
||
| 93 | glVertex3f(x2, y2, 0.f); |
||
| 94 | |||
| 95 | //Top-right vertex (corner) |
||
| 96 | glTexCoord2i(1, 1); |
||
| 97 | glVertex3f(x2, y1, 0.f); |
||
| 98 | |||
| 99 | //Top-left vertex (corner) |
||
| 100 | glTexCoord2i(0, 1); |
||
| 101 | glVertex3f(x1, y1, 0.f); |
||
| 102 | glEnd(); |
||
| 103 | } |
||
| 104 | } |