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float3 light_position;
float4 diffuse_color;
float alpha;
/* Ported from ex_prim_shader_pixel.glsl. See that file for the comments. */
#define AMBIENT_COLOR float4(1, 1, 1, 1)
#define AMBIENT_INTENSITY 0.01
#define SPECULAR_COLOR float4(1, 1, 1, 1)
float4 ps_main(VS_OUTPUT Input) : COLOR0
{
float3 light_vector = light_position - Input.PixelPosition;
float3 light_dir = normalize(light_vector);
float3 normal_vector = normalize(Input.Normal);
float reflectance = dot(light_dir, normal_vector);
reflectance = max(reflectance, 0.0f);
float specular_intensity = dot((2 * reflectance * normal_vector - light_dir), float3(0, 0, 1));
specular_intensity = max(0, specular_intensity);
specular_intensity = pow(specular_intensity, alpha);
float diffuse_intensity = reflectance * 10000.0 / dot(light_vector, light_vector);
return AMBIENT_COLOR * AMBIENT_INTENSITY + diffuse_color * diffuse_intensity + SPECULAR_COLOR * specular_intensity;
}
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