From 843308f07547b969c97efc23848f4e81b50a5b24 Mon Sep 17 00:00:00 2001 From: Matt Strapp Date: Wed, 24 Nov 2021 09:18:24 -0600 Subject: Do a5 --- dev/a5-artrender/shaders/artsy.frag | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) (limited to 'dev/a5-artrender/shaders/artsy.frag') diff --git a/dev/a5-artrender/shaders/artsy.frag b/dev/a5-artrender/shaders/artsy.frag index a148eaa..ea5b334 100644 --- a/dev/a5-artrender/shaders/artsy.frag +++ b/dev/a5-artrender/shaders/artsy.frag @@ -20,5 +20,26 @@ uniform sampler2D specular_ramp; void main() { - color = vec4(0,0,0,1); + // normalized normal + vec3 n = normalize(normal_in_eye_space); + + // unit vector from the vertex to the light + vec3 l = normalize(light_in_eye_space - position_in_eye_space); + + // unit vector from the vertex to the eye point, which is at 0,0,0 in "eye space" + vec3 e = normalize(-position_in_eye_space); + + // halfway vector + vec3 h = normalize(l + e); + + // calculate color using the light intensity equation + vec4 ambient = Ia * ka; + float diff_intensity = max(dot(n, l), 0.0); + vec2 diffuse_texture = vec2(diff_intensity, 0.0); + vec4 diffuse = Id * kd * texture(diffuse_ramp, diffuse_texture); + float spec_intensity = pow(max(dot(n, h), 0.0), s); + vec2 specular_texture = vec2(spec_intensity, 0.0); + vec4 specular = Is * ks * texture(specular_ramp, specular_texture); + + color = diffuse + specular; } -- cgit v1.2.3