| '''OpenGL extension EXT.protected_textures |
| |
| This module customises the behaviour of the |
| OpenGL.raw.GLES2.EXT.protected_textures to provide a more |
| Python-friendly API |
| |
| Overview (from the spec) |
| |
| This extension requires another extension like EGL_EXT_protected_content to |
| have created a protected context. A protected context enables the |
| driver to put the GPU into a protected mode where it is able to operate on |
| protected surfaces. |
| |
| This extension enables allocating standard GL textures as protected |
| surfaces. Previously these textures would have had to have been created as |
| special EGL surfaces. This allows use-cases such as depth, stencil, or |
| mipmapped textures to be supported as destinations for rendering within |
| a protected context. |
| |
| An explanation of undefined behavior in this extension: Several places |
| in this extension mention undefined behavior can result, which can |
| include program termination. The reason for this is because one way |
| to handle protected content is by using a protected virtual to physical |
| memory translation layer. With this sort of solution a system may generate |
| read or write faults when a non-protected context tries to access the |
| buffer. Depending on the system these faults might be ignored or they might |
| cause process termination. This undefined behavior should not include |
| actually allowing copying any protected content to a non-protected surface. |
| |
| This extension does not guarantee that the implementation abides by a |
| system's digital rights management requirements. It must be verified beyond |
| the existence of this extension that the implementation of this extension is |
| trustworthy according to the requirements of a content protection system. |
| |
| The official definition of this extension is available here: |
| http://www.opengl.org/registry/specs/EXT/protected_textures.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.EXT.protected_textures import * |
| from OpenGL.raw.GLES2.EXT.protected_textures import _EXTENSION_NAME |
|
|
| def glInitProtectedTexturesEXT(): |
| '''Return boolean indicating whether this extension is available''' |
| from OpenGL import extensions |
| return extensions.hasGLExtension( _EXTENSION_NAME ) |
|
|
|
|
| |
