bgfx/3rdparty/glsl-optimizer/tests/vertex/opt-negsub-in.txt

uniform mat4 mvp;
uniform mat3 m3a, m3b, m3c;
uniform vec4 v3a, v3b, v3c;

void main() {
	gl_Position = mvp * gl_Vertex;

	vec3 ta = -(v3a.xyz - gl_Vertex.xyz);
	vec3 ra = m3a * ta;

	vec3 tb = -((mvp * v3b).xyz - gl_Vertex.xyz);
	vec3 rb = m3b * tb;

	vec3 rc = m3c * (-(v3c.xyz - gl_Vertex.xyz));

	gl_FrontColor = vec4(ra+rb+rc,1.0);
}