| '''OpenGL extension EXT.framebuffer_sRGB |
| |
| This module customises the behaviour of the |
| OpenGL.raw.WGL.EXT.framebuffer_sRGB to provide a more |
| Python-friendly API |
| |
| Overview (from the spec) |
| |
| Conventionally, OpenGL assumes framebuffer color components are stored |
| in a linear color space. In particular, framebuffer blending is a |
| linear operation. |
| |
| The sRGB color space is based on typical (non-linear) monitor |
| characteristics expected in a dimly lit office. It has been |
| standardized by the International Electrotechnical Commission (IEC) |
| as IEC 61966-2-1. The sRGB color space roughly corresponds to 2.2 |
| gamma correction. |
| |
| 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. |
| |
| The primary motivation for this extension is that it allows OpenGL |
| applications to render into a framebuffer that is scanned to a monitor |
| configured to assume framebuffer color values are sRGB encoded. |
| This assumption is roughly true of most PC monitors with default |
| gamma correction. This allows applications to achieve faithful |
| color reproduction for OpenGL rendering without adjusting the |
| monitor's gamma correction. |
| |
| The official definition of this extension is available here: |
| http://www.opengl.org/registry/specs/EXT/framebuffer_sRGB.txt |
| ''' |
| from OpenGL import platform, constant, arrays |
| from OpenGL import extensions, wrapper |
| import ctypes |
| from OpenGL.raw.WGL import _types, _glgets |
| from OpenGL.raw.WGL.EXT.framebuffer_sRGB import * |
| from OpenGL.raw.WGL.EXT.framebuffer_sRGB import _EXTENSION_NAME |
|
|
| def glInitFramebufferSrgbEXT(): |
| '''Return boolean indicating whether this extension is available''' |
| from OpenGL import extensions |
| return extensions.hasGLExtension( _EXTENSION_NAME ) |
|
|
|
|
| |
