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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4 | tom | 1 | #include "SDL/SDL_image.h" |
| 2 | #include "SDL/SDL_opengl.h" |
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| 3 | |||
| 4 | #include <iostream> |
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| 5 | |||
| 6 | using namespace std; |
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| 7 | |||
| 8 | #include "texture.hpp" |
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| 9 | |||
| 10 | Texture::Texture(string filename) |
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| 11 | { |
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| 12 | loaded = false; |
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| 13 | |||
| 14 | GLenum textureFormat = GL_RGB; |
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| 15 | |||
| 16 | SDL_Surface *surface = IMG_Load(filename.c_str()); |
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| 17 | if (surface) |
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| 18 | { |
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| 19 | GLint noOfColours = surface->format->BytesPerPixel; |
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| 20 | if (noOfColours == 4) |
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| 21 | { |
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| 22 | if (surface->format->Rmask == 0x000000ff) |
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| 23 | { |
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| 24 | textureFormat = GL_RGBA; |
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| 25 | } |
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| 26 | else |
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| 27 | { |
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| 28 | textureFormat = GL_BGRA; |
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| 29 | } |
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| 30 | } |
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| 31 | else if (noOfColours == 3) |
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| 32 | { |
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| 33 | if (surface->format->Rmask == 0x000000ff) |
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| 34 | { |
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| 35 | textureFormat = GL_RGB; |
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| 36 | } |
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| 37 | else |
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| 38 | { |
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| 39 | textureFormat = GL_BGR; |
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| 40 | } |
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| 41 | } |
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| 42 | else |
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| 43 | { |
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| 44 | // Big Problem! |
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| 45 | } |
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| 46 | |||
| 47 | glGenTextures(1, &texture); |
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| 48 | |||
| 49 | glBindTexture(GL_TEXTURE_2D, texture); |
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| 50 | |||
| 51 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
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| 52 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
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| 53 | |||
| 54 | width = surface->w; |
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| 55 | height = surface->h; |
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| 56 | halfWidth = width * 0.5; |
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| 57 | halfHeight = height * 0.5; |
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| 58 | |||
| 59 | glTexImage2D(GL_TEXTURE_2D, 0, noOfColours, width, height, 0, textureFormat, GL_UNSIGNED_BYTE, surface->pixels); |
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| 60 | |||
| 61 | SDL_FreeSurface(surface); |
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| 62 | |||
| 63 | loaded = true; |
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| 64 | } |
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| 65 | } |
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| 66 | |||
| 67 | Texture::~Texture() |
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| 68 | { |
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| 69 | if (loaded) |
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| 70 | { |
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| 71 | glDeleteTextures(1, &texture); |
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| 72 | } |
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| 73 | } |
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| 74 | |||
| 75 | void Texture::draw(int x, int y) |
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| 76 | { |
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| 77 | if (loaded) |
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| 78 | { |
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| 79 | glBindTexture(GL_TEXTURE_2D, texture); |
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| 80 | |||
| 81 | int x1 = x - halfWidth; |
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| 82 | int x2 = x + halfWidth; |
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| 83 | int y1 = y - halfHeight; |
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| 84 | int y2 = y + halfHeight; |
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| 85 | |||
| 86 | glBegin(GL_QUADS); |
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| 87 | //Bottom-left vertex (corner) |
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| 88 | glTexCoord2i(0, 0); |
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| 89 | glVertex3f(x1, y2, 0.0f); |
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| 90 | |||
| 91 | //Bottom-right vertex (corner) |
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| 92 | glTexCoord2i(1, 0); |
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| 93 | glVertex3f(x2, y2, 0.f); |
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| 94 | |||
| 95 | //Top-right vertex (corner) |
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| 96 | glTexCoord2i(1, 1); |
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| 97 | glVertex3f(x2, y1, 0.f); |
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| 98 | |||
| 99 | //Top-left vertex (corner) |
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| 100 | glTexCoord2i(0, 1); |
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| 101 | glVertex3f(x1, y1, 0.f); |
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| 102 | glEnd(); |
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| 103 | } |
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| 104 | } |
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| 5 | tom | 105 | |
| 106 | void drawTexture(Texture *texture, int x, int y) |
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| 107 | { |
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| 108 | if (texture) |
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| 109 | { |
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| 110 | texture->draw(x, y); |
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| 111 | } |
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| 112 | } |