fe213f80a4
This is the first step of moving the create infos back inside shader sources. All info files are now treated as source files. However, they are not considered in the include tree yet. This will come in another following PR. Each shader source file now generate a `.info` file containing only the create info declarations. This renames all info files so that they do not conflict with their previous versions that were copied (non-generated). Pull Request: https://projects.blender.org/blender/blender/pulls/146676
86 lines
2.3 KiB
GLSL
86 lines
2.3 KiB
GLSL
/* SPDX-FileCopyrightText: 2025 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/**
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* GPU generated indirection buffer. Updated on topology change.
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* One thread processes one curve.
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*/
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#include "draw_curves_infos.hh"
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COMPUTE_SHADER_CREATE_INFO(draw_curves_topology)
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#include "gpu_shader_attribute_load_lib.glsl"
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#include "gpu_shader_offset_indices_lib.glsl"
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#include "gpu_shader_utildefines_lib.glsl"
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void main()
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{
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if (gl_GlobalInvocationID.x >= uint(curves_count)) {
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return;
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}
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uint curve_id = gl_GlobalInvocationID.x + uint(curves_start);
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bool is_curve_cyclic = false;
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if (use_cyclic) {
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is_curve_cyclic = gpu_attr_load_bool(curves_cyclic_buf, curve_id);
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}
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IndexRange points = offset_indices::load_range_from_buffer(evaluated_offsets_buf, curve_id);
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int index_start = points.start();
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int num_segment = points.size();
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if (use_cyclic) {
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index_start += int(curve_id);
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num_segment += 1;
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}
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constexpr int cyclic_endpoint_pivot = INT_MAX / 2;
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constexpr int end_of_curve = INT_MAX;
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int indirection_index_count = num_segment + (is_ribbon_topology ? 1 : -1);
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index_start += int(is_ribbon_topology ? curve_id : -curve_id);
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for (int i = 0; i < indirection_index_count; i++) {
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int value = int((i == 0) ? curve_id : -i);
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bool is_restart = false;
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bool is_cyclic_last_segment = false;
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if (use_cyclic) {
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if (is_ribbon_topology) {
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is_cyclic_last_segment = i == indirection_index_count - 2;
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if (is_curve_cyclic) {
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is_restart = i == indirection_index_count - 1;
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}
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else {
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is_restart = i >= indirection_index_count - 2;
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}
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}
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else {
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is_cyclic_last_segment = i == indirection_index_count - 1;
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if (is_curve_cyclic) {
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is_restart = false;
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}
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else {
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is_restart = i == indirection_index_count - 1;
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}
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}
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}
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else {
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if (is_ribbon_topology) {
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is_restart = i == indirection_index_count - 1;
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}
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else {
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is_restart = false;
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}
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}
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indirection_buf[index_start + i] = is_restart ? end_of_curve :
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(is_cyclic_last_segment ?
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value - cyclic_endpoint_pivot :
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value);
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}
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}
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