| 46 | } |
| 47 | |
| 48 | int numberOfComponents(const GLenum format) |
| 49 | { |
| 50 | switch (format) |
| 51 | { |
| 52 | case GL_RED: |
| 53 | case GL_GREEN: |
| 54 | case GL_BLUE: |
| 55 | case GL_RED_INTEGER: |
| 56 | case GL_GREEN_INTEGER: |
| 57 | case GL_BLUE_INTEGER: |
| 58 | |
| 59 | case GL_ALPHA: |
| 60 | case GL_LUMINANCE: |
| 61 | case GL_LUMINANCE_ALPHA: |
| 62 | |
| 63 | case GL_STENCIL_INDEX: |
| 64 | case GL_COLOR_INDEX: |
| 65 | case GL_DEPTH_COMPONENT: |
| 66 | case GL_DEPTH_STENCIL: |
| 67 | return 1; |
| 68 | |
| 69 | case GL_RG: |
| 70 | case GL_RG_INTEGER: |
| 71 | return 2; |
| 72 | |
| 73 | case GL_RGB: |
| 74 | case GL_BGR: |
| 75 | case GL_RGB_INTEGER: |
| 76 | case GL_BGR_INTEGER: |
| 77 | return 3; |
| 78 | |
| 79 | case GL_RGBA: |
| 80 | case GL_BGRA: |
| 81 | case GL_RGBA_INTEGER: |
| 82 | case GL_BGRA_INTEGER: |
| 83 | return 4; |
| 84 | default: |
| 85 | return 1; |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | int bytesPerPixel(const GLenum format, const GLenum type) |
| 90 | { |