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Use gl_VertexID for OpenGL #156

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Use gl_VertexID for OpenGL #156

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4 changes: 4 additions & 0 deletions Shaders/VertexShader.glsl
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,11 @@ layout(location = 1) out flat vec3 o_Normal;
layout(location = 2) out flat vec3 o_Color;
void main() {
gl_Position = modelViewProj * a_Positions;
#ifdef VULKAN
int face = gl_VertexIndex / 6;
#else
int face = gl_VertexID / 6;
#endif
o_TexCoord = uvec2(face, 0);
o_Normal = (model * normals[face]).xyz;
o_Color = color.rgb;
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