[hbursk]

Here’s my current issue trying to use MoltenGL. This is printed in my console. Any help would be appreciated.

[mgl-info] Converting GLSL:
#version 100

attribute  vec4    vertex;        
attribute  vec4    color;         
uniform  mat4      matrix;        
varying  vec4      c;             
void main()                            
{                                      
    gl_Position = matrix * vertex;     
    c = color;                         
}

End GLSL

[mgl-info] Converted MSL:
#include <metal_stdlib>
using namespace metal;
struct xlatMtlShaderInput {
  float4 vertex [[attribute(0)]];
  float4 color [[attribute(1)]];
};
struct xlatMtlShaderOutput {
  float4 gl_Position [[position]];
  float4 c;
};
struct xlatMtlShaderUniform {
  float4x4 matrix;
};
vertex xlatMtlShaderOutput VertexShader5 (xlatMtlShaderInput _mtl_i [[stage_in]], constant xlatMtlShaderUniform& _mtl_u [[buffer(0)]])
{
  xlatMtlShaderOutput _mtl_o;
  _mtl_o.gl_Position = (_mtl_u.matrix * _mtl_i.vertex);
  _mtl_o.c = _mtl_i.color;
  _mtl_o.gl_Position.z = (_mtl_o.gl_Position.z + _mtl_o.gl_Position.w) / 2.0f;
  return _mtl_o;
}

End MSL

Compilation failed: 

program_source:4:3: warning: declaration does not declare anything
  float4 vertex [[attribute(0)]];
  ^~~~~~
program_source:17:48: error: expected unqualified-id
  _mtl_o.gl_Position = (_mtl_u.matrix * _mtl_i.vertex);
                                               ^
 (code 3) (null)

Shader 5 could not be compiled.

[hbursk]

Looks like vertex was being treated as a special keyword in Metal, so I changed it to position. App is up and running now.

[hbursk]

Seem to be getting EXC_BAD_ACCESS crashes when calling glDrawElements(). This is using the shader I modified. Still some work to do there. Not sure why it’s crashing, and I don’t get much of a trace.

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