}
/* Expected output: vertex
-uniform mat4 model_matrix;
-uniform mat4 vp_matrix;
+layout(location=0) uniform mat4 model_matrix;
+layout(location=4) uniform mat4 vp_matrix;
layout(location=0) in vec4 position;
void main()
{
*/
/* Expected output: fragment
-uniform vec3 ambient;
+layout(location=8) uniform vec3 ambient;
layout(location=0) out vec4 frag_color;
void main()
{