| '''OpenGL extension QCOM.framebuffer_foveated |
| |
| This module customises the behaviour of the |
| OpenGL.raw.GLES2.QCOM.framebuffer_foveated to provide a more |
| Python-friendly API |
| |
| Overview (from the spec) |
| |
| Foveated rendering is a technique that aims to reduce fragment processing |
| workload and bandwidth by reducing the average resolution of a framebuffer. |
| Perceived image quality is kept high by leaving the focal point of |
| rendering at full resolution. |
| |
| It exists in two major forms: |
| |
| - Static foveated(lens matched) rendering: where the gaze point is |
| fixed with a large fovea region and designed to match up with the lens |
| characteristics. |
| - Eye-tracked foveated rendering: where the gaze point is continuously |
| tracked by a sensor to allow a smaller fovea region (further reducing |
| average resolution) |
| |
| Traditionally foveated rendering involves breaking a framebuffer's area |
| into smaller regions such as bins, tiles, viewports, or layers which are |
| rendered to individually. Each of these regions has the geometry projected |
| or scaled differently so that the net resolution of these layers is less |
| than the original framebuffer's resolution. When these regions are mapped |
| back to the original framebuffer, they create a rendered result with |
| decreased quality as pixels get further from the focal point. |
| |
| Foveated rendering is currently achieved by large modifications to an |
| applications render pipelines to manually implement the required geometry |
| amplifications, blits, and projection changes. This presents a large |
| implementation cost to an application developer and is generally |
| inefficient as it can not make use of a platforms unique hardware features |
| or optimized software paths. This extension aims to address these problems |
| by exposing foveated rendering in an explicit and vendor neutral way, and by |
| providing an interface with minimal changes to how an application specifies |
| its framebuffer. |
| |
| The official definition of this extension is available here: |
| http://www.opengl.org/registry/specs/QCOM/framebuffer_foveated.txt |
| ''' |
| from OpenGL import platform, constant, arrays |
| from OpenGL import extensions, wrapper |
| import ctypes |
| from OpenGL.raw.GLES2 import _types, _glgets |
| from OpenGL.raw.GLES2.QCOM.framebuffer_foveated import * |
| from OpenGL.raw.GLES2.QCOM.framebuffer_foveated import _EXTENSION_NAME |
|
|
| def glInitFramebufferFoveatedQCOM(): |
| '''Return boolean indicating whether this extension is available''' |
| from OpenGL import extensions |
| return extensions.hasGLExtension( _EXTENSION_NAME ) |
|
|
| glFramebufferFoveationConfigQCOM=wrapper.wrapper(glFramebufferFoveationConfigQCOM).setInputArraySize( |
| 'providedFeatures', 1 |
| ) |
| |
