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AppGameKit Classic Chat / Tier2: Is there a way to pass a OpenGl "mat4" to a shader uniform?

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Sandwich
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Posted: 31st Mar 2018 13:27
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Hi and a happy easter-weekend to all

I was wondering if there is no way to set a mat4 as shader uniform...
At first I assumed I could achieve this by handling the mat4 as an array[4][4] and pass the values with "SetShaderConstantArrayByName(...)".

In this case I get an error message that a mat4 can't be handled as an array...

So at the current state, I need to do the transform from array[4][4] to mat4 inside the vertex-shader, what is very unsatisfying:



Thanks again and a nice long weekend!
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Preben
AGK Studio Developer
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Posted: 6th Apr 2018 22:25 Edited at: 6th Apr 2018 22:34
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Yes we got what we got, but perhaps this will help



Each myUniform is a vec4 so no need for the looping.

Edit: Tier1
SetShaderConstantArrayByName(myshader,"myUniform",0,x1,y1,z1,w1)
SetShaderConstantArrayByName(myshader,"myUniform",1,x2,y2,z2,w2)
SetShaderConstantArrayByName(myshader,"myUniform",2,x3,y3,z3,w3)
SetShaderConstantArrayByName(myshader,"myUniform",3,x4,y4,z4,w4)
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best regards Preben Eriksen,
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Golelorn
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Posted: 7th Apr 2018 01:55 Edited at: 7th Apr 2018 01:55
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FYI,

You can not reference an array with a variable in GLES. It has to be an integer, as in Preben's example.
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Sandwich
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Posted: 10th Apr 2018 08:57
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Thank you both!

@Golelorn: You're right. I didn't recognize because currently I'm testing on Desktop and there it is possible. I just read that it isn't for pure GLES-Devices.
@Preben: This is the (more) platform independent way, thanks.
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