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author | Dan Goodliffe <dan@randomdan.homeip.net> | 2024-10-26 12:48:45 +0100 |
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committer | Dan Goodliffe <dan@randomdan.homeip.net> | 2024-10-26 12:48:45 +0100 |
commit | 75c36fe3aa875f6377f9adec8ffedf112d6335cb (patch) | |
tree | 88e5647b2f4152d7c7a5885a86c0ec171a27b86f /gfx/gl/shaders/directionalLight.fs | |
parent | Improve sun illumination based on angular size and astronomical twilight (diff) | |
download | ilt-main.tar.bz2 ilt-main.tar.xz ilt-main.zip |
Diffstat (limited to 'gfx/gl/shaders/directionalLight.fs')
-rw-r--r-- | gfx/gl/shaders/directionalLight.fs | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/gfx/gl/shaders/directionalLight.fs b/gfx/gl/shaders/directionalLight.fs index 86447ec..cdf0389 100644 --- a/gfx/gl/shaders/directionalLight.fs +++ b/gfx/gl/shaders/directionalLight.fs @@ -17,24 +17,35 @@ uniform ivec3 lightPoint; uniform mat4 lightViewProjection[MAX_MAPS]; uniform uint lightViewProjectionCount; -const vec3 e1 = vec3(0, 0, 0), e2 = vec3(1, 1, 1); +float +getShadow(vec3 positionInLightSpace, float m, vec2 texelSize) +{ + float shadow = 0.0; + for (float x = -texelSize.x; x <= texelSize.x; x += texelSize.x) { + for (float y = -texelSize.y; y <= texelSize.y; y += texelSize.y) { + const float lightSpaceDepth = texture(shadowMap, vec3(positionInLightSpace.xy + vec2(x, y), m)).r; + shadow += step(positionInLightSpace.z, lightSpaceDepth + 0.001); + } + } + return shadow / 9.0; +} float -insideShadowCube(vec3 v) +insideShadowCube(vec3 v, vec2 texelSize) { - const vec3 s = step(e1, v) - step(e2, v); + const vec3 s = step(vec3(texelSize, 0), v) - step(vec3(1 - texelSize, 1), v); return s.x * s.y * s.z; } float isShaded(vec4 Position) { + const vec2 texelSize = 1.0 / textureSize(shadowMap, 0).xy; for (uint m = 0u; m < lightViewProjectionCount; m++) { - const vec3 PositionInLightSpace = (lightViewProjection[m] * Position).xyz; - const float inside = insideShadowCube(PositionInLightSpace); + const vec3 positionInLightSpace = (lightViewProjection[m] * Position).xyz; + const float inside = insideShadowCube(positionInLightSpace, texelSize); if (inside > 0) { - const float lightSpaceDepth = texture(shadowMap, vec3(PositionInLightSpace.xy, m)).r; - return step(PositionInLightSpace.z, lightSpaceDepth + 0.001); + return getShadow(positionInLightSpace, m, texelSize); } } return 1; |