opengl - How to make this code work on Mesa3d? -

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this glsl code compile , run warningless in ati's opengl:

void main() {   vec4 tmp = gl_modelviewmatrix * gl_vertex;   tmp.xyz = tmp.xyz / (1 - tmp.w);   tmp.w = 1;   gl_position = gl_projectionmatrix * tmp;   gl_frontcolor = gl_color; }

why fail mesa? how decrypt error message , make mesa's implementation compliant?

compilation log: 0:1(88): error: not implicitly convert operands arithmetic operator 0:1(89): error: operands arithmetic operators must numeric 0:1(97): error: type mismatch

try changing 1s 1.0s.


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