layers/gpu/shaders/cmd_validation/count_buffer.comp

// Copyright (c) 2021-2024 The Khronos Group Inc.
// Copyright (c) 2021-2024 Valve Corporation
// Copyright (c) 2021-2024 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 "common.h"
#include "draw_push_data.h"

layout(push_constant)
uniform PushConstants {
    CountBufferPushData pc;
};

layout(set = kDiagPerCmdDescriptorSet, binding = kPreDrawBinding_CountBuffer) 
readonly buffer CountBuffer {
    uint count_buffer[];
};

layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
void main() {
    const uint draw_count = count_buffer[ pc.count_buffer_dwords_offset ];
    if (draw_count == 0) return;

    const uint64_t draw_buffer_max_read_offset = pc.draw_cmds_byte_stride * (draw_count - 1) + pc.draw_buffer_offset + pc.draw_cmd_byte_size;
    if (draw_buffer_max_read_offset > pc.draw_buffer_size) {
        GpuavLogError2(kErrorGroupGpuPreDraw, kErrorSubCodePreDraw_DrawBufferSize, draw_count, 0);
    } else if (draw_count > pc.device_limit_max_draw_indirect_count) {
        GpuavLogError2(kErrorGroupGpuPreDraw, kErrorSubCodePreDraw_DrawCountLimit, draw_count, 0);
    }
}