Shader language version in ARM GLES3.1 Emulator ver 2.2?

Thanks Adam and Peter for quick reply. Sorry but issue seems to be little different. It is writing following log whether shader compilation fails or succeeds i.e shader with #version 310 es as first line. So for me too it succeeds for basic shaders but is failing for some complex ones.

Error: 0:1: P0007: Language version '310' unknown, this compiler only supports up to version '300 es'

Error: 0:1: P0007: Unexpected text found after #version directive

Error: 0:8: L0001: Typename expected, found 'layout'

Error: 0:8: L0001: Expected identifier, found '('

My shader code starts with something like

----------------------------------------------------------------------------------------------

#version 310 es

#define SHADER_PROFILE 310

#ifdef GL_FRAGMENT_PRECISION_HIGH

    precision highp float;

#else

    precision mediump float;

#endif

layout(row_major) uniform;

-------------------------------------------------------------------------------------------

So if compilation fails I can not locate real issue because only glGetShaderInfoLog returns only first 4 lines of compilation

Below information might help you in sorting out the issue.

GL_RENDERER - "Mali OpenGL ES Emulator 2.2"

OS - Windows 7

glGetError succeeds at glCompileShader()

My system has only one emulator installation i.e. Mali OpenGL ES Emulator 2.2.

Please find below graphics card detail

Renderer: Quadro 5000/PCIe/SSE2

Vendor: NVIDIA Corporation

Memory: 2560 MB

Version: 4.4.0 NVIDIA 353.06

Shading language version: 4.40 NVIDIA via Cg compiler

Regards

Sunil

Thanks Adam and Peter for quick reply. Sorry but issue seems to be little different. It is writing following log whether shader compilation fails or succeeds i.e shader with #version 310 es as first line. So for me too it succeeds for basic shaders but is failing for some complex ones.

Error: 0:1: P0007: Language version '310' unknown, this compiler only supports up to version '300 es'

Error: 0:1: P0007: Unexpected text found after #version directive

Error: 0:8: L0001: Typename expected, found 'layout'

Error: 0:8: L0001: Expected identifier, found '('

My shader code starts with something like

----------------------------------------------------------------------------------------------

#version 310 es

#define SHADER_PROFILE 310

#ifdef GL_FRAGMENT_PRECISION_HIGH

    precision highp float;

#else

    precision mediump float;

#endif

layout(row_major) uniform;

-------------------------------------------------------------------------------------------

So if compilation fails I can not locate real issue because only glGetShaderInfoLog returns only first 4 lines of compilation

Below information might help you in sorting out the issue.

GL_RENDERER - "Mali OpenGL ES Emulator 2.2"

OS - Windows 7

glGetError succeeds at glCompileShader()

My system has only one emulator installation i.e. Mali OpenGL ES Emulator 2.2.

Please find below graphics card detail

Renderer: Quadro 5000/PCIe/SSE2

Vendor: NVIDIA Corporation

Memory: 2560 MB

Version: 4.4.0 NVIDIA 353.06

Shading language version: 4.40 NVIDIA via Cg compiler

Regards

Sunil

Hi Sunil,

thanks for details, it helped a lot in finding the actual issue.

The #version 310 es is supported and your shaders should be correctly compiled (means - not error flag set), linked and can be used to run GL ES 3.1 programs on the Emulator.

However, there is misleading log message for this case only (version 310 es), which you've observed.

We've captured this one issue and there will be a fix for it making next release free from the inconvenience.

As a work-around, please take GL_NO_ERROR returned from glGetError() in the first place as indication whether shader compilation succeeded, and a bit less rely on text log analysis, if possible for the time being.

If you have ES 3.1 shader that set an error code on compilation attempt, then please have a look to the log to see whether the reason of it is indicated there. Don't hesitate to share your concerns if any expected language feature seems to be unsupported.

These two lines you can ignore for now:

Error: 0:1: P0007: Language version '310' unknown, this compiler only supports up to version '300 es'

Error: 0:1: P0007: Unexpected text found after #version directive

The shader compilation results and the support for ES 3.1 language features in the Emulator have been tested with official conformance tests suite therefore I'm convinced you should be able to use the Emulator productively. However, the exact compilation log content, as vendor specific - was not part of the that detailed check

So, well spotted!

Thanks,

Adam

Hi Adam,

Thanks for quick update, Actually GLSL built in function 'mix' is causing problem. Linking log hints at this. 

error C1115: unable to find compatible overloaded function "mix(float, float, float)"

error C1115: unable to find compatible overloaded function "mix(vec3, vec3, float)"

Removing 'mix' from fragment shader compiles/links successfully. Please suggest if there is any workaround.

Hi Sunil,

Let's see. We are aware about some issues with 'mix' using uvec types.

As 'mix' comes with overloaded versions, can you point which particular one is troublesome in your case?

Is it possible you share the whole shader source that causes the problem?

cheers,

Adam

Hi Adam,

Built in function 'mix' is not working even for very basic example of mixing colors from two textures., it works if I remove outColor = mix(texture(tex1, texOut),texture(tex2,texOut),0.5f); by outColor = texture(tex1, texOut); It means problem lies with 'mix' function only.

----------------------------------------------

#version 310 es

precision highp float;

in vec3 vv3colour;

in vec2 texOut;

out vec4 outColor;

uniform sampler2D tex1;

uniform sampler2D tex2;

void main() {

  outColor = mix(texture(tex1, texOut),texture(tex2,texOut),0.5f);

}

----------------------------------------

In another case where I can not share other share shader codes, I created sample fragment shader to reproduce. It seems mix(vec4,vec4,float) is not working and gives following error while linking

error C1115: unable to find compatible overloaded function "mix(vec3, vec3, float)" as shared in my above post.

-------------------------------------------------

#version 310 es

precision highp float;

in vec3 vv3colour;

out vec4 outColor;

void main() {

  outColor = mix(vec4(vv3colour,1.0),vec4(0.0,0.0,0.0,1.0),1.0);

}

--------------------------------------------------

Please let me know if it helps, and you can run above shaders successfully.

Hi Sunil,

it was helpful indeed, and we have reproduction for the problem.

I confirm this is a valid issue for the Emulator and we'll prepare a fix for it.

The not-so-convenient and temporary workaround for the moment would be dropping the built-in and switching to custom mix(vec4,vec4,float) function in your shader, by declaring it:

-------------------

vec4 mix(vec4 x, vec4 y, float a) { return (1-a)*x + a*y; }

-------------------

You can expect announcement on this thread when this issue gets resolution and the workaround is no longer necessary.

Thanks for your report,

Adam