463 lines
18 KiB
C++
463 lines
18 KiB
C++
/*
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* Vulkan Example - Font rendering using signed distance fields
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*
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* This sample compares rendering resolution independent fonts using signed distance fields to traditional bitmap fonts
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*
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* Font generated using https://github.com/libgdx/libgdx/wiki/Hiero
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*
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* Copyright (C) 2016-2023 by Sascha Willems - www.saschawillems.de
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*
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* This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
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*/
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#include "vulkanexamplebase.h"
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// Vertex layout for this example
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struct Vertex {
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float pos[3];
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float uv[2];
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};
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// AngelCode .fnt format structs and classes
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struct bmchar {
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uint32_t x, y;
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uint32_t width;
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uint32_t height;
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int32_t xoffset;
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int32_t yoffset;
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int32_t xadvance;
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uint32_t page;
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};
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// Quick and dirty : We store complete ASCII table
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// Only chars present in the .fnt are filled with data, so not a complete, production ready solution!
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std::array<bmchar, 255> fontChars;
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int32_t nextValuePair(std::stringstream *stream)
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{
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std::string pair;
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*stream >> pair;
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size_t spos = pair.find("=");
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std::string value = pair.substr(spos + 1);
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int32_t val = std::stoi(value);
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return val;
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}
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class VulkanExample : public VulkanExampleBase
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{
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public:
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bool splitScreen = true;
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struct Textures {
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vks::Texture2D fontSDF;
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vks::Texture2D fontBitmap;
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} textures;
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vks::Buffer vertexBuffer;
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vks::Buffer indexBuffer;
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uint32_t indexCount{ 0 };
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struct UniformData {
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// Scene matrices
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glm::mat4 projection;
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glm::mat4 modelView;
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// Font display options
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glm::vec4 outlineColor{ 1.0f, 0.0f, 0.0f, 0.0f };
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float outlineWidth{ 0.6f };
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float outline{ true };
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} uniformData;
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vks::Buffer uniformBuffer;
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struct Pipelines {
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VkPipeline sdf{ VK_NULL_HANDLE };
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VkPipeline bitmap{ VK_NULL_HANDLE };
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} pipelines;
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struct DescriptorSets {
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VkDescriptorSet sdf{ VK_NULL_HANDLE };
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VkDescriptorSet bitmap{ VK_NULL_HANDLE };
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} descriptorSets;
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VkPipelineLayout pipelineLayout{ VK_NULL_HANDLE };
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VkDescriptorSetLayout descriptorSetLayout{ VK_NULL_HANDLE };
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VulkanExample() : VulkanExampleBase()
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{
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title = "Distance field font rendering";
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camera.type = Camera::CameraType::lookat;
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camera.setPosition(glm::vec3(0.0f, 0.0f, -2.0f));
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camera.setRotation(glm::vec3(0.0f));
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camera.setPerspective(splitScreen ? 30.0f : 45.0f, (float)width / (float)(height * ((splitScreen) ? 0.5f : 1.0f)), 1.0f, 256.0f);
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}
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~VulkanExample()
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{
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if (device) {
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textures.fontSDF.destroy();
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textures.fontBitmap.destroy();
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vkDestroyPipeline(device, pipelines.sdf, nullptr);
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vkDestroyPipeline(device, pipelines.bitmap, nullptr);
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vkDestroyPipelineLayout(device, pipelineLayout, nullptr);
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vkDestroyDescriptorSetLayout(device, descriptorSetLayout, nullptr);
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vertexBuffer.destroy();
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indexBuffer.destroy();
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uniformBuffer.destroy();
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}
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}
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// Basic parser for AngelCode bitmap font format files
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// See http://www.angelcode.com/products/bmfont/doc/file_format.html for details
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void parsebmFont()
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{
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std::string fileName = getAssetPath() + "font.fnt";
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#if defined(__ANDROID__)
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// Font description file is stored inside the apk
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// So we need to load it using the asset manager
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AAsset* asset = AAssetManager_open(androidApp->activity->assetManager, fileName.c_str(), AASSET_MODE_STREAMING);
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assert(asset);
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size_t size = AAsset_getLength(asset);
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assert(size > 0);
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void *fileData = malloc(size);
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AAsset_read(asset, fileData, size);
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AAsset_close(asset);
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std::stringbuf sbuf((const char*)fileData);
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std::istream istream(&sbuf);
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#else
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std::filebuf fileBuffer;
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fileBuffer.open(fileName, std::ios::in);
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std::istream istream(&fileBuffer);
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#endif
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assert(istream.good());
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while (!istream.eof())
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{
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std::string line;
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std::stringstream lineStream;
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std::getline(istream, line);
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lineStream << line;
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std::string info;
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lineStream >> info;
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if (info == "char")
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{
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// char id
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uint32_t charid = nextValuePair(&lineStream);
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// Char properties
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fontChars[charid].x = nextValuePair(&lineStream);
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fontChars[charid].y = nextValuePair(&lineStream);
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fontChars[charid].width = nextValuePair(&lineStream);
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fontChars[charid].height = nextValuePair(&lineStream);
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fontChars[charid].xoffset = nextValuePair(&lineStream);
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fontChars[charid].yoffset = nextValuePair(&lineStream);
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fontChars[charid].xadvance = nextValuePair(&lineStream);
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fontChars[charid].page = nextValuePair(&lineStream);
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}
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}
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}
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void loadAssets()
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{
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textures.fontSDF.loadFromFile(getAssetPath() + "textures/font_sdf_rgba.ktx", VK_FORMAT_R8G8B8A8_UNORM, vulkanDevice, queue);
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textures.fontBitmap.loadFromFile(getAssetPath() + "textures/font_bitmap_rgba.ktx", VK_FORMAT_R8G8B8A8_UNORM, vulkanDevice, queue);
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}
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void buildCommandBuffers()
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{
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VkCommandBufferBeginInfo cmdBufInfo = vks::initializers::commandBufferBeginInfo();
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VkClearValue clearValues[2];
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clearValues[0].color = defaultClearColor;
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clearValues[1].depthStencil = { 1.0f, 0 };
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VkRenderPassBeginInfo renderPassBeginInfo = vks::initializers::renderPassBeginInfo();
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renderPassBeginInfo.renderPass = renderPass;
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renderPassBeginInfo.renderArea.offset.x = 0;
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renderPassBeginInfo.renderArea.offset.y = 0;
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renderPassBeginInfo.renderArea.extent.width = width;
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renderPassBeginInfo.renderArea.extent.height = height;
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renderPassBeginInfo.clearValueCount = 2;
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renderPassBeginInfo.pClearValues = clearValues;
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for (int32_t i = 0; i < drawCmdBuffers.size(); ++i)
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{
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renderPassBeginInfo.framebuffer = frameBuffers[i];
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VK_CHECK_RESULT(vkBeginCommandBuffer(drawCmdBuffers[i], &cmdBufInfo));
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vkCmdBeginRenderPass(drawCmdBuffers[i], &renderPassBeginInfo, VK_SUBPASS_CONTENTS_INLINE);
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VkViewport viewport = vks::initializers::viewport((float)width, (splitScreen) ? (float)height / 2.0f : (float)height, 0.0f, 1.0f);
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vkCmdSetViewport(drawCmdBuffers[i], 0, 1, &viewport);
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VkRect2D scissor = vks::initializers::rect2D(width, height, 0, 0);
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vkCmdSetScissor(drawCmdBuffers[i], 0, 1, &scissor);
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VkDeviceSize offsets[1] = { 0 };
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// Signed distance field font
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vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayout, 0, 1, &descriptorSets.sdf, 0, NULL);
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vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.sdf);
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vkCmdBindVertexBuffers(drawCmdBuffers[i], 0, 1, &vertexBuffer.buffer, offsets);
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vkCmdBindIndexBuffer(drawCmdBuffers[i], indexBuffer.buffer, 0, VK_INDEX_TYPE_UINT32);
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vkCmdDrawIndexed(drawCmdBuffers[i], indexCount, 1, 0, 0, 0);
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// Linear filtered bitmap font
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if (splitScreen)
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{
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viewport.y = (float)height / 2.0f;
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vkCmdSetViewport(drawCmdBuffers[i], 0, 1, &viewport);
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vkCmdBindDescriptorSets(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelineLayout, 0, 1, &descriptorSets.bitmap, 0, NULL);
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vkCmdBindPipeline(drawCmdBuffers[i], VK_PIPELINE_BIND_POINT_GRAPHICS, pipelines.bitmap);
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vkCmdDrawIndexed(drawCmdBuffers[i], indexCount, 1, 0, 0, 0);
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}
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drawUI(drawCmdBuffers[i]);
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vkCmdEndRenderPass(drawCmdBuffers[i]);
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VK_CHECK_RESULT(vkEndCommandBuffer(drawCmdBuffers[i]));
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}
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}
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// Creates a vertex and index buffer with triangle data containing the chars of the given text
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void generateText(std:: string text)
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{
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std::vector<Vertex> vertices;
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std::vector<uint32_t> indices;
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uint32_t indexOffset = 0;
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float w = static_cast<float>(textures.fontSDF.width);
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float posx = 0.0f;
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float posy = 0.0f;
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for (uint32_t i = 0; i < text.size(); i++)
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{
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bmchar *charInfo = &fontChars[(int)text[i]];
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if (charInfo->width == 0)
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charInfo->width = 36;
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float charw = ((float)(charInfo->width) / 36.0f);
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float dimx = 1.0f * charw;
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float charh = ((float)(charInfo->height) / 36.0f);
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float dimy = 1.0f * charh;
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float us = charInfo->x / w;
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float ue = (charInfo->x + charInfo->width) / w;
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float ts = charInfo->y / w;
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float te = (charInfo->y + charInfo->height) / w;
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float xo = charInfo->xoffset / 36.0f;
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float yo = charInfo->yoffset / 36.0f;
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posy = yo;
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vertices.push_back({ { posx + dimx + xo, posy + dimy, 0.0f }, { ue, te } });
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vertices.push_back({ { posx + xo, posy + dimy, 0.0f }, { us, te } });
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vertices.push_back({ { posx + xo, posy, 0.0f }, { us, ts } });
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vertices.push_back({ { posx + dimx + xo, posy, 0.0f }, { ue, ts } });
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std::array<uint32_t, 6> letterIndices = { 0,1,2, 2,3,0 };
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for (auto& index : letterIndices)
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{
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indices.push_back(indexOffset + index);
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}
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indexOffset += 4;
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float advance = ((float)(charInfo->xadvance) / 36.0f);
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posx += advance;
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}
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indexCount = static_cast<uint32_t>(indices.size());
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// Center
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for (auto& v : vertices)
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{
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v.pos[0] -= posx / 2.0f;
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v.pos[1] -= 0.5f;
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}
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// Generate host accessible buffers for the text vertices and indices and upload the data
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VK_CHECK_RESULT(vulkanDevice->createBuffer(VK_BUFFER_USAGE_VERTEX_BUFFER_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, &vertexBuffer, vertices.size() * sizeof(Vertex), vertices.data()));
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VK_CHECK_RESULT(vulkanDevice->createBuffer(VK_BUFFER_USAGE_INDEX_BUFFER_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, &indexBuffer, indices.size() * sizeof(uint32_t), indices.data()));
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}
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void setupDescriptors()
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{
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// Pool
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std::vector<VkDescriptorPoolSize> poolSizes = {
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vks::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 2),
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vks::initializers::descriptorPoolSize(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 2)
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};
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VkDescriptorPoolCreateInfo descriptorPoolInfo = vks::initializers::descriptorPoolCreateInfo(poolSizes, 2);
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VK_CHECK_RESULT(vkCreateDescriptorPool(device, &descriptorPoolInfo, nullptr, &descriptorPool));
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// Layout
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// The pipeline uses one set and three bindings
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// Binding 0 : Shader uniform buffer
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// Binding 1 : Fragment shader image sampler
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std::vector<VkDescriptorSetLayoutBinding> setLayoutBindings = {
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vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, VK_SHADER_STAGE_VERTEX_BIT | VK_SHADER_STAGE_FRAGMENT_BIT, 0),
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vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, VK_SHADER_STAGE_FRAGMENT_BIT, 1),
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};
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VkDescriptorSetLayoutCreateInfo descriptorLayout = vks::initializers::descriptorSetLayoutCreateInfo(setLayoutBindings);
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VK_CHECK_RESULT(vkCreateDescriptorSetLayout(device, &descriptorLayout, nullptr, &descriptorSetLayout));
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// Sets
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VkDescriptorSetAllocateInfo allocInfo = vks::initializers::descriptorSetAllocateInfo(descriptorPool, &descriptorSetLayout, 1);
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// Signed distance font descriptor set
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VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorSets.sdf));
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std::vector<VkWriteDescriptorSet> writeDescriptorSets = {
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vks::initializers::writeDescriptorSet(descriptorSets.sdf, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 0, &uniformBuffer.descriptor),
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vks::initializers::writeDescriptorSet(descriptorSets.sdf, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 1, &textures.fontSDF.descriptor),
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};
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vkUpdateDescriptorSets(device, static_cast<uint32_t>(writeDescriptorSets.size()), writeDescriptorSets.data(), 0, nullptr);
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// Bitmap font descriptor set
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VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorSets.bitmap));
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writeDescriptorSets = {
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vks::initializers::writeDescriptorSet(descriptorSets.bitmap, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 0, &uniformBuffer.descriptor),
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vks::initializers::writeDescriptorSet(descriptorSets.bitmap, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 1, &textures.fontBitmap.descriptor)
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};
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vkUpdateDescriptorSets(device, static_cast<uint32_t>(writeDescriptorSets.size()), writeDescriptorSets.data(), 0, nullptr);
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}
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void preparePipelines()
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{
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// Layout
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VkPipelineLayoutCreateInfo pipelineLayoutCreateInfo = vks::initializers::pipelineLayoutCreateInfo(&descriptorSetLayout, 1);
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VK_CHECK_RESULT(vkCreatePipelineLayout(device, &pipelineLayoutCreateInfo, nullptr, &pipelineLayout));
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// Pipelines
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VkPipelineInputAssemblyStateCreateInfo inputAssemblyState = vks::initializers::pipelineInputAssemblyStateCreateInfo(VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST, 0, VK_FALSE);
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VkPipelineRasterizationStateCreateInfo rasterizationState = vks::initializers::pipelineRasterizationStateCreateInfo(VK_POLYGON_MODE_FILL, VK_CULL_MODE_NONE, VK_FRONT_FACE_COUNTER_CLOCKWISE, 0);
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VkPipelineColorBlendAttachmentState blendAttachmentState = vks::initializers::pipelineColorBlendAttachmentState(0xf, VK_TRUE);
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VkPipelineColorBlendStateCreateInfo colorBlendState = vks::initializers::pipelineColorBlendStateCreateInfo(1, &blendAttachmentState);
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VkPipelineDepthStencilStateCreateInfo depthStencilState = vks::initializers::pipelineDepthStencilStateCreateInfo(VK_FALSE, VK_TRUE, VK_COMPARE_OP_LESS_OR_EQUAL);
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VkPipelineViewportStateCreateInfo viewportState = vks::initializers::pipelineViewportStateCreateInfo(1, 1, 0);
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VkPipelineMultisampleStateCreateInfo multisampleState = vks::initializers::pipelineMultisampleStateCreateInfo(VK_SAMPLE_COUNT_1_BIT, 0);
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std::vector<VkDynamicState> dynamicStateEnables = { VK_DYNAMIC_STATE_VIEWPORT, VK_DYNAMIC_STATE_SCISSOR };
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VkPipelineDynamicStateCreateInfo dynamicState = vks::initializers::pipelineDynamicStateCreateInfo(dynamicStateEnables);
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std::array<VkPipelineShaderStageCreateInfo,2> shaderStages;
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// Enabled blending (With the background)
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blendAttachmentState.blendEnable = VK_TRUE;
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blendAttachmentState.srcColorBlendFactor = VK_BLEND_FACTOR_ONE;
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blendAttachmentState.dstColorBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
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blendAttachmentState.colorBlendOp = VK_BLEND_OP_ADD;
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blendAttachmentState.srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE;
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blendAttachmentState.dstAlphaBlendFactor = VK_BLEND_FACTOR_ZERO;
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blendAttachmentState.alphaBlendOp = VK_BLEND_OP_ADD;
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blendAttachmentState.colorWriteMask = VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT | VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT;
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// Vertex input state
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std::vector<VkVertexInputBindingDescription> vertexInputBindings = {
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vks::initializers::vertexInputBindingDescription(0, sizeof(Vertex), VK_VERTEX_INPUT_RATE_VERTEX)
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};
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std::vector<VkVertexInputAttributeDescription> vertexInputAttributes = {
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vks::initializers::vertexInputAttributeDescription(0, 0, VK_FORMAT_R32G32B32_SFLOAT, offsetof(Vertex, pos)),
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vks::initializers::vertexInputAttributeDescription(0, 1, VK_FORMAT_R32G32_SFLOAT, offsetof(Vertex, uv)),
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};
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VkPipelineVertexInputStateCreateInfo vertexInputState = vks::initializers::pipelineVertexInputStateCreateInfo();
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vertexInputState.vertexBindingDescriptionCount = static_cast<uint32_t>(vertexInputBindings.size());
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vertexInputState.pVertexBindingDescriptions = vertexInputBindings.data();
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vertexInputState.vertexAttributeDescriptionCount = static_cast<uint32_t>(vertexInputAttributes.size());
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vertexInputState.pVertexAttributeDescriptions = vertexInputAttributes.data();
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VkGraphicsPipelineCreateInfo pipelineCreateInfo = vks::initializers::pipelineCreateInfo(pipelineLayout, renderPass, 0);
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pipelineCreateInfo.pVertexInputState = &vertexInputState;
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pipelineCreateInfo.pInputAssemblyState = &inputAssemblyState;
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pipelineCreateInfo.pRasterizationState = &rasterizationState;
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pipelineCreateInfo.pColorBlendState = &colorBlendState;
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pipelineCreateInfo.pMultisampleState = &multisampleState;
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pipelineCreateInfo.pViewportState = &viewportState;
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pipelineCreateInfo.pDepthStencilState = &depthStencilState;
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pipelineCreateInfo.pDynamicState = &dynamicState;
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pipelineCreateInfo.stageCount = static_cast<uint32_t>(shaderStages.size());
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pipelineCreateInfo.pStages = shaderStages.data();
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// Signed distance font rendering pipeline
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shaderStages[0] = loadShader(getShadersPath() + "distancefieldfonts/sdf.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
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shaderStages[1] = loadShader(getShadersPath() + "distancefieldfonts/sdf.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
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VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &pipelines.sdf));
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// Bitmap font rendering pipeline
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shaderStages[0] = loadShader(getShadersPath() + "distancefieldfonts/bitmap.vert.spv", VK_SHADER_STAGE_VERTEX_BIT);
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shaderStages[1] = loadShader(getShadersPath() + "distancefieldfonts/bitmap.frag.spv", VK_SHADER_STAGE_FRAGMENT_BIT);
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VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCreateInfo, nullptr, &pipelines.bitmap));
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}
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// Prepare and initialize uniform buffer containing shader uniforms
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void prepareUniformBuffers()
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{
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// Vertex shader uniform buffer block
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VK_CHECK_RESULT(vulkanDevice->createBuffer(VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, &uniformBuffer, sizeof(UniformData)));
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VK_CHECK_RESULT(uniformBuffer.map());
|
|
updateUniformBuffers();
|
|
}
|
|
|
|
void updateUniformBuffers()
|
|
{
|
|
// Adjust camera perspective as we render two viewports
|
|
camera.setPerspective(splitScreen ? 30.0f : 45.0f, (float)width / (float)(height * ((splitScreen) ? 0.5f : 1.0f)), 1.0f, 256.0f);
|
|
uniformData.projection = camera.matrices.perspective;
|
|
uniformData.modelView = camera.matrices.view;
|
|
memcpy(uniformBuffer.mapped, &uniformData, sizeof(UniformData));
|
|
}
|
|
|
|
void prepare()
|
|
{
|
|
VulkanExampleBase::prepare();
|
|
parsebmFont();
|
|
loadAssets();
|
|
generateText("Vulkan");
|
|
prepareUniformBuffers();
|
|
setupDescriptors();
|
|
preparePipelines();
|
|
buildCommandBuffers();
|
|
prepared = true;
|
|
}
|
|
|
|
void draw()
|
|
{
|
|
VulkanExampleBase::prepareFrame();
|
|
submitInfo.commandBufferCount = 1;
|
|
submitInfo.pCommandBuffers = &drawCmdBuffers[currentBuffer];
|
|
VK_CHECK_RESULT(vkQueueSubmit(queue, 1, &submitInfo, VK_NULL_HANDLE));
|
|
VulkanExampleBase::submitFrame();
|
|
}
|
|
|
|
virtual void render()
|
|
{
|
|
if (!prepared)
|
|
return;
|
|
updateUniformBuffers();
|
|
draw();
|
|
}
|
|
|
|
virtual void OnUpdateUIOverlay(vks::UIOverlay *overlay)
|
|
{
|
|
if (overlay->header("Settings")) {
|
|
bool outline = (uniformData.outline == 1.0f);
|
|
if (overlay->checkBox("Outline", &outline)) {
|
|
uniformData.outline = outline ? 1.0f : 0.0f;
|
|
}
|
|
if (overlay->checkBox("Splitscreen", &splitScreen)) {
|
|
camera.setPerspective(splitScreen ? 30.0f : 45.0f, (float)width / (float)(height * ((splitScreen) ? 0.5f : 1.0f)), 1.0f, 256.0f);
|
|
buildCommandBuffers();
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
VULKAN_EXAMPLE_MAIN()
|