Difference between revisions of "GLES Shader Testing in Desktop"

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Writing shaders to support mobile devices might be not trivial. You may wondering is there a way to test shader in mobile devices without really using mobile device.
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Writing shaders to support mobile devices might be not trivial. You may be wondering if there is a way to test shaders on mobile devices without really using mobile device.
  
 
The answer is yes, there's a way.
 
The answer is yes, there's a way.
  
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Desktop GPU nowadays (even integrated one) should supports creating OpenGLES context, which means all shaders must be GLSLES/ESSL compatible. We can make LOVE to use OpenGLES context by using environment variable <code>LOVE_GRAPHICS_USE_OPENGLES=1</code>.
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GPUs nowadays (even integrated ones) should support creating OpenGL ES context, which means all shaders must be GLSL ES/ESSL compatible. We can make LOVE use OpenGL ES context by using the environment variable <code>LOVE_GRAPHICS_USE_OPENGLES=1</code>.
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Note that this guide is mostly Windows oriented. For other desktop platforms, please adapt accordingly!
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== love.graphics.validateShader ==
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Since [[11.0]], there's [[love.graphics.validateShader]] which can be used to validate both GLSL and ESSL shader code. Note that it only validates, it doesn't run your shader code. If you really want to run your game under GLES context, proceed below!
  
 
== Requirements ==
 
== Requirements ==
  
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You need GPU which supports OpenGLES context. As previously written, todays desktop GPU should support this.
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You need a GPU which supports OpenGL ES context or ANGLE. As previously written, today's GPUs should support this, thus ANGLE is normally unnecessary.
  
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If your GPU doesn't supports it, you might can use [https://chromium.googlesource.com/angle/angle ANGLE]. If you're under Windows, you can actually run LOVE using only DirectX 9 capable GPU by using ANGLE (you can grab the DLLs from your Google Chrome installation, named <code>libegl.dll</code> and <code>libopenglesv2.dll</code>. Just make sure it's 32-bit DLLs if you're using 32-bit version of LOVE (same also for 64-bit)).
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== Tell LOVE to use OpenGL ES context ==
  
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== Tell LOVE to use OpenGLES context ==
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FIXME: AMD drivers expose OpenGL ES context under EGL (and it's very hidden) which is not compatible with LOVE SDL build. For AMD GPUs in Windows, proceed below on using ANGLE directly.
  
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Now, we need to tell LOVE to use OpenGLES context. You need to set this environment variable before starting LOVE. It can be set using Command Prompt/Terminal and launching LOVE from same Terminal, or from Windows, from Advanced System Settings.
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Now, we need to tell LOVE to use OpenGL ES context. You need to set this environment variable before starting LOVE. It can be set using Command Prompt/Terminal and launching LOVE from same Terminal, or from Windows, from Advanced System Settings.
  
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* Windows: <code>set LOVE_GRAPHICS_USE_OPENGLES=1</code> then <code>lovec ...</code> (this assume [[0.10.2]] used)
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* Windows: <code>set LOVE_GRAPHICS_USE_OPENGLES=1</code> then <code>lovec ...</code>. [[0.10.2]] or later is assumed.
  
 
* Linux/macOS: <code>LOVE_GRAPHICS_USE_OPENGLES=1 love ...</code>
 
* Linux/macOS: <code>LOVE_GRAPHICS_USE_OPENGLES=1 love ...</code>
  
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Verify if LOVE uses OpenGLES context by calling [[love.graphics.getRendererInfo]] and check if the 1st return value is "OpenGL ES".
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Verify if LOVE uses OpenGL ES context by checking the 1st return value of [[love.graphics.getRendererInfo]] which should be "OpenGL ES".
 +
 
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Once you've got OpenGL ES context, you can test if your shader code works on mobile devices. Otherwise, if you're on Windows, proceed below.
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== Using ANGLE in Windows ==
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{{notice|Using ANGLE with AMD GPU in Windows requires LÖVE [[11.5]] or later.}}
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[https://chromium.googlesource.com/angle/angle ANGLE] is an implementation of OpenGL ES 2.0 and 3.0 on top of other rendering backends. In Windows, it will run OpenGL ES using Direct3D 11 or Direct3D 9. If your GPU doesn't support OpenGL ES context or if you want to force ANGLE, you can copy '''libEGL.dll''' and '''libGLESv2.dll''' from [https://github.com/MikuAuahDark/angle-winbuild here], or on one of these applications:
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* Google Chrome
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* Microsoft Edge Chromium
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 +
* Visual Studio Code
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 +
* osu! stable (32-bit DLL)
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 +
Note: Using Firefox's DLLs doesn't work because it links with Firefox-specific DLLs and copying all the dependent DLLs can be troublesome.
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 +
One thing for sure is '''make sure the bit count of the DLL matches''', i.e. 64-bit Chrome has 64-bit DLLs and can only be used on 64-bit LOVE.
  
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Once you got OpenGLES context, you can test your shader code if it works under mobile devices.
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Next, set the environment <code>LOVE_GRAPHICS_USE_OPENGLES=1</code> and <code>SDL_OPENGL_ES_DRIVER=1</code> then launch LOVE. To confirm you're using ANGLE backend, check the 2nd return value of [[love.graphics.getRendererInfo]] which should contain "ANGLE" (all uppercase).
  
 
{{#set:LOVE Version=0.10.0}}
 
{{#set:LOVE Version=0.10.0}}
 
[[Category:Tutorials]]
 
[[Category:Tutorials]]

Latest revision as of 03:13, 16 February 2024

Writing shaders to support mobile devices might be not trivial. You may be wondering if there is a way to test shaders on mobile devices without really using mobile device.

The answer is yes, there's a way.

GPUs nowadays (even integrated ones) should support creating OpenGL ES context, which means all shaders must be GLSL ES/ESSL compatible. We can make LOVE use OpenGL ES context by using the environment variable LOVE_GRAPHICS_USE_OPENGLES=1.

Note that this guide is mostly Windows oriented. For other desktop platforms, please adapt accordingly!

love.graphics.validateShader

Since 11.0, there's love.graphics.validateShader which can be used to validate both GLSL and ESSL shader code. Note that it only validates, it doesn't run your shader code. If you really want to run your game under GLES context, proceed below!

Requirements

You need a GPU which supports OpenGL ES context or ANGLE. As previously written, today's GPUs should support this, thus ANGLE is normally unnecessary.

Tell LOVE to use OpenGL ES context

FIXME: AMD drivers expose OpenGL ES context under EGL (and it's very hidden) which is not compatible with LOVE SDL build. For AMD GPUs in Windows, proceed below on using ANGLE directly.

Now, we need to tell LOVE to use OpenGL ES context. You need to set this environment variable before starting LOVE. It can be set using Command Prompt/Terminal and launching LOVE from same Terminal, or from Windows, from Advanced System Settings.

  • Windows: set LOVE_GRAPHICS_USE_OPENGLES=1 then lovec .... 0.10.2 or later is assumed.
  • Linux/macOS: LOVE_GRAPHICS_USE_OPENGLES=1 love ...

Verify if LOVE uses OpenGL ES context by checking the 1st return value of love.graphics.getRendererInfo which should be "OpenGL ES".

Once you've got OpenGL ES context, you can test if your shader code works on mobile devices. Otherwise, if you're on Windows, proceed below.

Using ANGLE in Windows

O.png Using ANGLE with AMD GPU in Windows requires LÖVE 11.5 or later.  


ANGLE is an implementation of OpenGL ES 2.0 and 3.0 on top of other rendering backends. In Windows, it will run OpenGL ES using Direct3D 11 or Direct3D 9. If your GPU doesn't support OpenGL ES context or if you want to force ANGLE, you can copy libEGL.dll and libGLESv2.dll from here, or on one of these applications:

  • Google Chrome
  • Microsoft Edge Chromium
  • Visual Studio Code
  • osu! stable (32-bit DLL)

Note: Using Firefox's DLLs doesn't work because it links with Firefox-specific DLLs and copying all the dependent DLLs can be troublesome.

One thing for sure is make sure the bit count of the DLL matches, i.e. 64-bit Chrome has 64-bit DLLs and can only be used on 64-bit LOVE.

Next, set the environment LOVE_GRAPHICS_USE_OPENGLES=1 and SDL_OPENGL_ES_DRIVER=1 then launch LOVE. To confirm you're using ANGLE backend, check the 2nd return value of love.graphics.getRendererInfo which should contain "ANGLE" (all uppercase).

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