| '''OpenGL extension EXT.sRGB |
| |
| This module customises the behaviour of the |
| OpenGL.raw.GLES1.EXT.sRGB to provide a more |
| Python-friendly API |
| |
| Overview (from the spec) |
| |
| The sRGB color space is based on typical (non-linear) response of the human |
| eye. It has been standardized by the International Electrotechnical |
| Commission (IEC) as IEC 61966-2-1. The transfer function of sRGB roughly |
| corresponds to a power function with a gamma of 2.2. |
| |
| FRAMEBUFFERS |
| |
| OpenGL assumes framebuffer color components are stored in a linear color |
| space. In particular, framebuffer blending is a linear operation. |
| |
| This extension adds a framebuffer capability for sRGB framebuffer update |
| and blending. When blending is disabled but the new sRGB updated mode is |
| enabled (assume the framebuffer supports the capability), high-precision |
| linear color component values for red, green, and blue generated by |
| fragment coloring are encoded for sRGB prior to being written into the |
| framebuffer. When blending is enabled along with the new sRGB update mode, |
| red, green, and blue framebuffer color components are treated as sRGB |
| values that are converted to linear color values, blended with the high- |
| precision color values generated by fragment coloring, and then the blend |
| result is encoded for sRGB just prior to being written into the |
| framebuffer. |
| |
| TEXTURES |
| |
| Conventional texture formats assume a linear color space. So for a |
| conventional internal texture format such as GL_RGB8, the 256 discrete |
| values for each 8-bit color component map linearly and uniformly to the |
| [0,1] range. |
| |
| The official definition of this extension is available here: |
| http://www.opengl.org/registry/specs/EXT/sRGB.txt |
| ''' |
| from OpenGL import platform, constant, arrays |
| from OpenGL import extensions, wrapper |
| import ctypes |
| from OpenGL.raw.GLES1 import _types, _glgets |
| from OpenGL.raw.GLES1.EXT.sRGB import * |
| from OpenGL.raw.GLES1.EXT.sRGB import _EXTENSION_NAME |
|
|
| def glInitSrgbEXT(): |
| '''Return boolean indicating whether this extension is available''' |
| from OpenGL import extensions |
| return extensions.hasGLExtension( _EXTENSION_NAME ) |
|
|
|
|
| |
