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// Copyright (c) 2021-2025 The Khronos Group Inc.
// Copyright (c) 2021-2025 Valve Corporation
// Copyright (c) 2021-2025 LunarG, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#version 450
#extension GL_GOOGLE_include_directive : enable
#include "gpuav_shaders_constants.h"
#include "push_data.h"
layout(push_constant) uniform UniformInfo {
DrawIndexedIndirectIndexBufferPushData pc;
};
// CountBuffer won't be bound for non-count draws
layout(set = kValPipeDescSet, binding = kPreDrawBinding_CountBuffer)
readonly buffer CountBuffer {
uint count_buffer[];
};
layout(set = kValPipeDescSet, binding = kPreDrawBinding_DispatchIndirectBuffer)
buffer DipatchIndirectBuffer {
uint dispatch_indirect_x;
uint dispatch_indirect_y;
uint dispatch_indirect_z;
};
layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
void main() {
uint draw_count = 0;
if ((pc.flags & kIndexedIndirectDrawFlags_DrawCountFromBuffer) == 0) {
draw_count = pc.api_draw_count;
} else {
// Need to clamp draw count value stored in count buffer to the maxDrawCount
// that was specified at vkCmdDrawIndexedIndirect time.
// pc.api_draw_count is used to store maxDrawCount
draw_count = min(count_buffer[pc.api_count_buffer_offset_dwords], pc.api_draw_count);
}
dispatch_indirect_x =
(draw_count / DrawIndexedIndirect_LocalWorkGroupSizeX) +
uint((draw_count % DrawIndexedIndirect_LocalWorkGroupSizeX) > 0);
dispatch_indirect_y = 1;
dispatch_indirect_z = 1;
}
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