43 lines
785 B
Plaintext
43 lines
785 B
Plaintext
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#version 330
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layout (points) in;
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layout (triangle_strip) out;
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layout (max_vertices = 4) out;
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uniform mat4 m;
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uniform mat4 vp;
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uniform vec3 eye;
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out vec2 uv;
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void main()
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{
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vec3 pos = gl_in[0].gl_Position.xyz;
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vec3 toCamera = normalize(eye - pos);
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vec3 up = vec3(0.0, 1.0, 0.0);
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vec3 right = cross(toCamera, up);
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pos -= (right * 0.5);
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gl_Position = vp * vec4(pos, 1.0);
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uv = vec2(0.0, 0.0);
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EmitVertex();
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pos.y += 1.0;
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gl_Position = vp * vec4(pos, 1.0);
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uv = vec2(0.0, 1.0);
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EmitVertex();
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pos.y -= 1.0;
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pos += right;
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gl_Position = vp * vec4(pos, 1.0);
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uv = vec2(1.0, 0.0);
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EmitVertex();
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pos.y += 1.0;
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gl_Position = vp * vec4(pos, 1.0);
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uv = vec2(1.0, 1.0);
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EmitVertex();
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EndPrimitive();
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}
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