Eevee: Move cube shadows to octahedron shadowmaps.

We render linear distance to the light in a R32 texture and store it into an octahedron projection inside a 2D texture array.

This render the sampling function much more simpler and without edge artifacts.

1 files changed, 9 insertions, 0 deletions

diff --git a/source/blender/draw/engines/eevee/shaders/shadow_vert.glsl b/source/blender/draw/engines/eevee/shaders/shadow_vert.glsl
index ffb99f1b35c..323cf4d2a99 100644
--- a/source/blender/draw/engines/eevee/shaders/shadow_vert.glsl
+++ b/source/blender/draw/engines/eevee/shaders/shadow_vert.glsl
@@ -1,12 +1,21 @@
 
+layout(std140) uniform shadow_render_block {
+	mat4 ShadowMatrix[6];
+	vec4 lampPosition;
+	int layer;
+};
+
 uniform mat4 ShadowModelMatrix;
 
 in vec3 pos;
 
 out vec4 vPos;
+out float lDist;
+
 flat out int face;
 
 void main() {
 	vPos = ShadowModelMatrix * vec4(pos, 1.0);
+	lDist = distance(lampPosition.xyz, vPos.xyz);
 	face = gl_InstanceID;
 }
\ No newline at end of file