112 lines
2.9 KiB
C++
112 lines
2.9 KiB
C++
/* -*- tab-width: 4; -*- */
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/* vi: set sw=2 ts=4 expandtab: */
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/*
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* Copyright 2017-2020 Mark Callow.
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @internal
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* @class Texture3d
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* @~English
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*
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* @brief Definition of test sample for loading and displaying the slices of a 3d texture.
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*
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* @author Mark Callow, github.com/MarkCallow.
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*
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* @par Acknowledgement
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* Thanks to Sascha Willems' - www.saschawillems.de - for the concept,
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* the VulkanTextOverlay class and the shaders used by this test.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <algorithm>
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#include <time.h>
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#include <vector>
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#include "Texture3d.h"
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#include "ltexceptions.h"
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VulkanLoadTestSample*
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Texture3d::create(VulkanContext& vkctx,
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uint32_t width, uint32_t height,
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const char* const szArgs, const std::string sBasePath)
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{
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return new Texture3d(vkctx, width, height, szArgs, sBasePath);
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}
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#define INSTANCE_COUNT_CONST_ID 1
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#define INSTANCES_DECLARED_IN_SHADER 30
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Texture3d::Texture3d(VulkanContext& vkctx,
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uint32_t width, uint32_t height,
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const char* const szArgs, const std::string sBasePath)
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: InstancedSampleBase(vkctx, width, height, szArgs, sBasePath)
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{
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zoom = -15.0f;
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if (texture.depth == 1) {
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std::stringstream message;
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message << "Texture3d requires a 3d texture.";
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throw std::runtime_error(message.str());
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}
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try {
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prepare("instancing3d.frag.spv", "instancing3d.vert.spv",
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INSTANCE_COUNT_CONST_ID, texture.depth,
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INSTANCES_DECLARED_IN_SHADER);
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} catch (std::exception& e) {
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(void)e; // To quiet unused variable warnings from some compilers.
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//cleanup(); // See explanation in TextureMipmap.cpp
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throw;
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}
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}
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#if 0
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// Addition of extra uniform buffer for the instance count is to work around
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// MoltenVK issue #issue 1421:
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// https://github.com/KhronosGroup/MoltenVK/issues/1421.
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void
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Texture3d::addSubclassDescriptors(DescriptorBindings& descriptorBindings)
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{
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descriptorBindings.push_back(vk::DescriptorSetLayoutBinding(
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2, // Binding 2 : uniform buffer for instanceCount value.
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vk::DescriptorType::eUniformBuffer,
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1,
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vk::ShaderStageFlagBits::eVertex
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));
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}
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#endif
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// Providing instanceCount via a push constant is a workaround for
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// MoltenVK issue #1421:
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// https://github.com/KhronosGroup/MoltenVK/issues/1421.
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void
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Texture3d::addSubclassPushConstantRanges(PushConstantRanges& ranges)
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{
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ranges.push_back(vk::PushConstantRange(
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vk::ShaderStageFlagBits::eVertex,
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0, // offset
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sizeof(instanceCount)
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));
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}
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void
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Texture3d::setSubclassPushConstants(uint32_t bufferIndex)
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{
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vkCmdPushConstants(
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vkctx.drawCmdBuffers[bufferIndex],
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pipelineLayout,
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VK_SHADER_STAGE_VERTEX_BIT,
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0,
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sizeof(instanceCount),
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&instanceCount
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);
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}
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