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[rs] Fix shadow sampling outside of the positive hemisphere

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This commit is contained in:
Dzmitry Malyshau 2019-10-24 12:27:10 -04:00
parent cdd3614b39
commit ca3d8038cf
1 changed files with 14 additions and 7 deletions
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21
wgpu/examples/shadow/forward.frag
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@ -28,6 +28,19 @@ layout(set = 1, binding = 0) uniform Entity {
vec4 u_Color;
};
float fetch_shadow(int light_id, vec4 homogeneous_coords) {
if (homogeneous_coords.w <= 0.0) {
return 1.0;
}
// compute texture coordinates for shadow lookup
vec4 light_local = vec4(
(homogeneous_coords.xy/homogeneous_coords.w + 1.0) / 2.0,
light_id,
homogeneous_coords.z / homogeneous_coords.w
);
// do the lookup, using HW PCF and comparison
return texture(sampler2DArrayShadow(t_Shadow, s_Shadow), light_local);
}
void main() {
vec3 normal = normalize(v_Normal);
@ -37,13 +50,7 @@ void main() {
for (int i=0; i<int(u_NumLights.x) && i<MAX_LIGHTS; ++i) {
Light light = u_Lights[i];
// project into the light space
vec4 light_local = light.proj * v_Position;
// compute texture coordinates for shadow lookup
light_local.xy = (light_local.xy/light_local.w + 1.0) / 2.0;
light_local.w = light_local.z / light_local.w;
light_local.z = i;
// do the lookup, using HW PCF and comparison
float shadow = texture(sampler2DArrayShadow(t_Shadow, s_Shadow), light_local);
float shadow = fetch_shadow(i, light.proj * v_Position);
// compute Lambertian diffuse term
vec3 light_dir = normalize(light.pos.xyz - v_Position.xyz);
float diffuse = max(0.0, dot(normal, light_dir));