/*
    This file is part of Magnum.

    Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
              Vladimír Vondruš <mosra@centrum.cz>

    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included
    in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.
*/

namespace Magnum {

/** @page platforms-gl OpenGL and OpenGL ES platforms
@brief Information common for all platforms that support OpenGL and OpenGL ES

@tableofcontents
@m_footernavigation

@todoc desktop gles

@section platforms-gl-best-practices OpenGL best practices

Various links gathered around the web:

-   [Performance tuning applications for Intel Graphics for Linux and Chrome OS](http://software.intel.com/sites/default/files/Performance-tuning-applications-for-Intel-GEN-Graphics-for-Linux-and-Google-Chrome-OS.pdf) [PDF]
-   [PowerVR Performance Recommendations](https://github.com/burningsun/pecker_framework/blob/master/参考资料/PowerVR.Performance%20Recommendations.pdf?raw=true) [PDF]
-   [ATI Radeon HD 2000 programming guide](http://developer.amd.com/wordpress/media/2012/10/ATI_Radeon_HD_2000_programming_guide.pdf) [PDF]

@section platforms-gl-es OpenGL ES

@subsection platforms-gl-es-best-practices OpenGL ES best practices

Various links gathered around the web:

-   [Writing Portable OpenGL ES 2.0](https://www.khronos.org/assets/uploads/developers/library/2011-siggraph-mobile/Writing-Portable-OpenGL-ES-2.0_Aug-11.pdf) [PDF]
-   [Optimize OpenGL ES 2.0 Performance for Tegra](http://docs.nvidia.com/tegra/index.html#GLES2_Perf_Main.html)

@subsection platforms-gl-es-differences Differences to desktop GL

-   Rendering to RGB textures doesn't work on many platforms, either due to
    alignment issues or other factors. For example it is not possible to render
    to @ref GL::TextureFormat::RGB8 on iOS (but it works elsewhere); rendering
    to @ref GL::TextureFormat::RGB32F is not possible even on NVidia. Use RGBA
    formats instead.
-   While on desktop GL it's often permitted to upload a RGB image to a texture
    with RGBA internal format, on mobile devices usually nothing happens. Be
    sure to match the component count.
-   Rendering to 16- and 32-bit float textures is only possible with OpenGL ES
    3.2 or with the @gl_extension{EXT,color_buffer_half_float} and
    @gl_extension{EXT,color_buffer_float} extensions. You can work around that
    issue by rendering to 32-bit unsigned integer textures and using the
    @glsl floatBitsToUInt() @ce GLSL function instead.
-   Linear filtering on 32-bit float textures is only possible with
    @gl_extension{OES,texture_float_linear} (it's not even on ES 3.2 yet). You can
    work around that issue by using half-float texture formats or doing the
    interpolation manually in a shader.

@subsection platforms-gl-es-angle ANGLE

[ANGLE](https://github.com/google/angle) is a layer that translates OpenGL ES
code to D3D, desktop GL or Vulkan, originally created for web browsers to
provide better WebGL experience without relying on buggy OpenGL drivers on
Windows.

Related links:

-   [WebGL Insights --- ANGLE](https://books.google.cz/books?id=6crECQAAQBAJ&lpg=PP1&pg=PA3&redir_esc=y#v=onepage&q&f=true)

*/

}