mesh.glsl

 
#version 460 
#extension GL_EXT_mesh_shader : require
 
#ifdef MESH_SHADER
uniform mat4 mvpMatrix;
 
layout(local_size_x= 4) in;
layout(triangles, max_vertices = 4, max_primitives = 2) out;
void main()
{
    SetMeshOutputsEXT(4, 2);
    
    vec2 positions[4]= vec2[4]( vec2(-1, -1), vec2(1, -1), vec2(1, 1), vec2(-1, 1) );
    
    if(gl_LocalInvocationIndex < 4)
        gl_MeshVerticesEXT[gl_LocalInvocationIndex].gl_Position= mvpMatrix * vec4( positions[gl_LocalInvocationIndex], 0, 1);
    
    if(gl_LocalInvocationIndex == 0)
        gl_PrimitiveTriangleIndicesEXT[0] =  uvec3(0, 1, 2);
    if(gl_LocalInvocationIndex == 1)    
        gl_PrimitiveTriangleIndicesEXT[1] =  uvec3(2, 3, 0);
}
#endif
 
#ifdef FRAGMENT_SHADER
uniform vec4 color;
 
out vec4 fragment_color;
void main()
{
    fragment_color= color;
}
#endif