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/**
* Debug Shader outputing a gradient of orange - white - blue to mark culling hotspots.
* Green pixels are error pixels that are missing lights from the culling pass (i.e: when culling
* pass is not conservative enough). This shader will only work on the last light batch so remove
* some lights from the scene you are debugging to have below CULLING_ITEM_BATCH lights.
*/
#pragma BLENDER_REQUIRE(common_view_lib.glsl)
#pragma BLENDER_REQUIRE(common_math_lib.glsl)
#pragma BLENDER_REQUIRE(eevee_culling_iter_lib.glsl)
layout(std140) uniform lights_block
{
LightData lights[CULLING_ITEM_BATCH];
};
layout(std140) uniform lights_culling_block
{
CullingData culling;
};
uniform usampler2D item_culling_tx;
uniform sampler2D depth_tx;
in vec4 uvcoordsvar;
layout(location = 0) out vec4 out_debug_color;
void main(void)
{
float depth = textureLod(depth_tx, uvcoordsvar.xy, 0.0).r;
float vP_z = get_view_z_from_depth(depth);
vec3 P = get_world_space_from_depth(uvcoordsvar.xy, depth);
float lights_count = 0.0;
uint lights_cull = 0u;
ITEM_FOREACH_BEGIN (culling, item_culling_tx, vP_z, l_idx) {
LightData light = lights[l_idx];
lights_cull |= 1u << l_idx;
lights_count += 1.0;
}
ITEM_FOREACH_END
uint lights_nocull = 0u;
ITEM_FOREACH_BEGIN_NO_CULL (culling, l_idx) {
LightData light = lights[l_idx];
if (distance(light._position, P) < light.influence_radius_max) {
lights_nocull |= 1u << l_idx;
}
}
ITEM_FOREACH_END
if ((lights_cull & lights_nocull) != lights_nocull) {
/* ERROR. Some lights were culled incorrectly. */
out_debug_color = vec4(0.0, 1.0, 0.0, 1.0);
}
else {
out_debug_color = vec4(heatmap_gradient(lights_count / 16.0), 1.0);
}
}
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