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[vulkan] Early out from lights that are too distant

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Gives a 43% speed boost to bigass1 timedemo (366 -> 525 fps).
This commit is contained in:
Bill Currie 2021-03-22 20:33:42 +09:00
parent 4eecbe867d
commit de581501fb
1 changed files with 6 additions and 1 deletions
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7
libs/video/renderer/vulkan/shader/lighting.frag
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@ -28,12 +28,17 @@ layout (location = 0) out vec4 frag_color;
vec3
calc_light (LightData light, vec3 position, vec3 normal)
{
float r = light.radius;
vec3 dist = light.position - position;
float d = sqrt (dot (dist, dist));
if (d > r) {
// the light is too far away
return vec3 (0);
}
vec3 incoming = dist / d;
float spotdot = dot (incoming, light.direction);
float lightdot = dot (incoming, normal);
float r = light.radius;
int style = light.data & 0x7f;
// deliberate array index error: access intensity2 as well