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/**
* Virtual shadowmapping: Tile copy.
*
* This pass copies the pages rendered in the render target to the page atlas.
* This might not be the fastest way to blit shadow regions but at least it is fully GPU driven.
*/
/* TODO(fclem): The goal would be to render on the atlas texture and only move pages if
* they overlap with the rendering. */
#pragma BLENDER_REQUIRE(eevee_shadow_tilemap_lib.glsl)
bool do_corner_pattern(vec2 uv, float corner_ratio)
{
uv = uv * 2.0 - 1.0;
return (any(greaterThan(abs(uv), vec2(1.0 - corner_ratio))) &&
all(greaterThan(abs(uv), vec2(1.0 - corner_ratio * 3.0))));
}
void main()
{
int page_size = textureSize(render_tx, 0).x / SHADOW_TILEMAP_RES;
for (int p = 0; p < pages_infos_buf.page_rendered; p++) {
uvec4 render_tile = unpackUvec4x8(pages_list_buf[p]);
ivec2 tile_co = ivec2(render_tile.xy);
ivec2 page_co = ivec2(render_tile.zw);
/* We dispatch enough group to cover one page. */
ivec2 page_texel = ivec2(gl_GlobalInvocationID.xy);
ivec2 in_texel = page_texel + tile_co * page_size;
ivec2 out_texel = page_texel + page_co * page_size;
float depth = texelFetch(render_tx, in_texel, 0).r;
#ifdef SHADOW_DEBUG_PAGE_CORNER
uvec2 page_size = gl_NumWorkGroups.xy * gl_WorkGroupSize.xy;
vec2 uv = vec2(gl_GlobalInvocationID.xy) / vec2(page_size);
/* Print corners to check tile layout and validity. */
if (do_corner_pattern(uv, 0.025)) {
depth = 0.0;
}
else if (do_corner_pattern(uv, 0.035)) {
depth = 1.0;
}
#endif
imageStore(out_atlas_img, out_texel, vec4(depth));
}
}
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