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#version 420 core
layout(std140, binding = 0) uniform block {
uniform mat4 ModelViewProjectionMatrix;
uniform mat4 NormalMatrix;
uniform vec4 MaterialDiffuse;
};
layout(location = 0) in vec3 in_position;
layout(location = 1) in vec3 in_normal;
layout(location = 0) out vec4 out_color;
vec4 LightSourcePosition = vec4(20.0, -20.0, 10.0, 1.0);
void main(void)
{
// Transform the normal to eye coordinates
vec3 N = normalize(vec3(NormalMatrix * vec4(in_normal, 1.0)));
// The LightSourcePosition is actually its direction for directional light
vec3 L = normalize(LightSourcePosition.xyz);
// Multiply the diffuse value by the vertex color (which is fixed in this case)
// to get the actual color that we will use to draw this vertex with
float diffuse = max(dot(N, L), 0.0);
out_color = vec4(diffuse * MaterialDiffuse.rgb, MaterialDiffuse.a);
// Transform the position to clip coordinates
gl_Position = ModelViewProjectionMatrix * vec4(in_position, 1.0);
}
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