bfb6ea898b
This implements the base needed for supporting multiple view concurently inside the same drawcall. The view used by common macros and view related functions is indexed using a global variable `drw_view_id` which can be set arbitrarly or read from the `drw_ResourceID`. This is needed for EEVEE-Next shadow but can be used for other purpose in the future. Note that a shader specialization is needed for it to work. `DRW_VIEW_LEN` needs to be defined to the amount of view the shader will access. The number of views contained in a `draw::View` is set at construction time. Note that the maximum number of object correctly drawn by the shaders using multiple views will be lower than thoses who don't.
54 lines
1.6 KiB
GLSL
54 lines
1.6 KiB
GLSL
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/**
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* Compute visibility of each resource bounds for a given view.
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*/
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/* TODO(fclem): This could be augmented by a 2 pass occlusion culling system. */
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#pragma BLENDER_REQUIRE(common_math_lib.glsl)
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#pragma BLENDER_REQUIRE(common_intersect_lib.glsl)
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shared uint shared_result;
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void mask_visibility_bit(uint view_id)
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{
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if (view_len > 1) {
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uint index = gl_GlobalInvocationID.x * uint(visibility_word_per_draw) + (view_id / 32u);
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visibility_buf[index] &= ~(1u << view_id);
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}
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else {
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atomicAnd(visibility_buf[gl_WorkGroupID.x], ~(1u << gl_LocalInvocationID.x));
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}
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}
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void main()
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{
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if (gl_GlobalInvocationID.x >= resource_len) {
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return;
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}
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ObjectBounds bounds = bounds_buf[gl_GlobalInvocationID.x];
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if (bounds.bounding_sphere.w != -1.0) {
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IsectBox box = isect_data_setup(bounds.bounding_corners[0].xyz,
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bounds.bounding_corners[1].xyz,
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bounds.bounding_corners[2].xyz,
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bounds.bounding_corners[3].xyz);
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Sphere bounding_sphere = Sphere(bounds.bounding_sphere.xyz, bounds.bounding_sphere.w);
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Sphere inscribed_sphere = Sphere(bounds.bounding_sphere.xyz, bounds._inner_sphere_radius);
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for (drw_view_id = 0; drw_view_id < view_len; drw_view_id++) {
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if (intersect_view(inscribed_sphere) == true) {
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/* Visible. */
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}
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else if (intersect_view(bounding_sphere) == false) {
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/* Not visible. */
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mask_visibility_bit(drw_view_id);
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}
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else if (intersect_view(box) == false) {
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/* Not visible. */
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mask_visibility_bit(drw_view_id);
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}
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}
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}
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}
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