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// Per-vertex phong shader
uniform mat4 worldViewProjection;
uniform vec3 lightWorldPos;
uniform vec4 lightColor;
uniform mat4 world;
uniform mat4 viewInverse;
uniform mat4 worldInverseTranspose;
uniform vec4 emissiveColor;
uniform vec4 ambientColor;
uniform vec4 diffuseColor;
uniform vec4 specularColor;
uniform float shininess;
uniform float specularFactor;
attribute vec3 g_Position;
attribute vec3 g_Normal;
varying vec4 v_color;
vec4 lit(float n_dot_l, float n_dot_h, float m) {
return vec4(1.,
clamp(n_dot_l, 0., 1.),
// FIXME: approximation to
// (n_dot_l < 0) || (n_dot_h < 0)
pow(clamp(n_dot_h, 0., 1.), m),
1.);
}
void main() {
vec4 position = vec4(g_Position, 1.);
vec4 worldPosition = world * position;
vec3 normal = normalize((worldInverseTranspose *
vec4(g_Normal, 0.)).xyz);
vec3 surfaceToLight = normalize(lightWorldPos - worldPosition.xyz);
vec3 surfaceToView = normalize((viewInverse[3] - worldPosition).xyz);
vec3 halfVector = normalize(surfaceToLight + surfaceToView);
vec4 litR = lit(dot(normal, surfaceToLight),
dot(normal, halfVector), shininess);
v_color =
vec4((emissiveColor +
lightColor * (ambientColor * litR.x +
diffuseColor * litR.y +
specularColor * litR.z * specularFactor)).rgb,
diffuseColor.a);
gl_Position = worldViewProjection * position;
}
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