mirror of https://github.com/bkaradzic/bgfx
382 lines
9.8 KiB
C++
382 lines
9.8 KiB
C++
/*
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* Copyright 2018 Ales Mlakar. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx/blob/master/LICENSE
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*/
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/*
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* Reference(s):
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* - Sparse Virtual Textures by Sean Barrett
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* http://web.archive.org/web/20190103162611/http://silverspaceship.com/src/svt/
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* - Based on Virtual Texture Demo by Brad Blanchard
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* http://web.archive.org/web/20190103162638/http://linedef.com/virtual-texture-demo.html
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* - Mars texture
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* http://web.archive.org/web/20190103162730/http://www.celestiamotherlode.net/catalog/mars.php
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*/
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#include "common.h"
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#include "bgfx_utils.h"
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#include "imgui/imgui.h"
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#include "camera.h"
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#include "vt.h"
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namespace
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{
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struct PosTexcoordVertex
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{
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float m_x;
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float m_y;
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float m_z;
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float m_u;
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float m_v;
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static void init()
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{
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ms_layout
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.begin()
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.add(bgfx::Attrib::Position, 3, bgfx::AttribType::Float)
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.add(bgfx::Attrib::TexCoord0, 2, bgfx::AttribType::Float)
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.end();
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};
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static bgfx::VertexLayout ms_layout;
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};
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bgfx::VertexLayout PosTexcoordVertex::ms_layout;
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static const float s_planeScale = 50.0f;
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static PosTexcoordVertex s_vplaneVertices[] =
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{
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{ -s_planeScale, 0.0f, s_planeScale, 1.0f, 1.0f },
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{ s_planeScale, 0.0f, s_planeScale, 1.0f, 0.0f },
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{ -s_planeScale, 0.0f, -s_planeScale, 0.0f, 1.0f },
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{ s_planeScale, 0.0f, -s_planeScale, 0.0f, 0.0f },
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};
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static const uint16_t s_planeIndices[] =
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{
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0, 1, 2,
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1, 3, 2,
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};
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class ExampleSVT : public entry::AppI
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{
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public:
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ExampleSVT(const char* _name, const char* _description, const char* _url)
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: entry::AppI(_name, _description, _url)
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{
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}
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void init(int32_t _argc, const char* const* _argv, uint32_t _width, uint32_t _height) override
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{
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Args args(_argc, _argv);
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m_width = _width;
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m_height = _height;
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m_debug = BGFX_DEBUG_TEXT;
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m_reset = BGFX_RESET_VSYNC;
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bgfx::Init init;
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init.type = args.m_type;
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init.vendorId = args.m_pciId;
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init.platformData.nwh = entry::getNativeWindowHandle(entry::kDefaultWindowHandle);
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init.platformData.ndt = entry::getNativeDisplayHandle();
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init.platformData.type = entry::getNativeWindowHandleType();
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init.resolution.width = m_width;
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init.resolution.height = m_height;
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init.resolution.reset = m_reset;
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bgfx::init(init);
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// Enable m_debug text.
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bgfx::setDebug(m_debug);
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// Set views clear state (first pass to 0, second pass to some background color)
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for (uint16_t i = 0; i < 2; ++i)
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{
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bgfx::setViewClear(i
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, BGFX_CLEAR_COLOR | BGFX_CLEAR_DEPTH
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, i == 0 ? 0 : 0x101050ff
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, 1.0f
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, 0
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);
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}
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// Create vertex stream declaration.
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PosTexcoordVertex::init();
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// Create static vertex buffer.
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m_vbh = bgfx::createVertexBuffer(
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bgfx::makeRef(s_vplaneVertices, sizeof(s_vplaneVertices))
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, PosTexcoordVertex::ms_layout
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);
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m_ibh = bgfx::createIndexBuffer(
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bgfx::makeRef(s_planeIndices, sizeof(s_planeIndices))
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);
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// Create program from shaders.
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m_vt_unlit = loadProgram("vs_vt_generic", "fs_vt_unlit");
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m_vt_mip = loadProgram("vs_vt_generic", "fs_vt_mip");
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// Imgui.
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imguiCreate();
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m_timeOffset = bx::getHPCounter();
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// Get renderer capabilities info.
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m_caps = bgfx::getCaps();
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m_scrollArea = 0;
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// Create and setup camera
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cameraCreate();
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cameraSetPosition({ 0.0f, 5.0f, 0.0f });
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cameraSetVerticalAngle(0.0f);
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// Set VirtualTexture system allocator
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vt::VirtualTexture::setAllocator(&m_vtAllocator);
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// Create Virtual texture info
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m_vti = new vt::VirtualTextureInfo();
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m_vti->m_virtualTextureSize = 8192; // The actual size will be read from the tile data file
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m_vti->m_tileSize = 128;
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m_vti->m_borderSize = 1;
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// Generate tile data file (if not yet created)
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{
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vt::TileGenerator tileGenerator(m_vti);
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tileGenerator.generate("textures/8k_mars.jpg");
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}
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// Load tile data file
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auto tileDataFile = new vt::TileDataFile("temp/8k_mars.vt", m_vti);
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tileDataFile->readInfo();
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// Create virtual texture and feedback buffer
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m_vt = new vt::VirtualTexture(tileDataFile, m_vti, 2048, 1);
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m_feedbackBuffer = new vt::FeedbackBuffer(m_vti, 64, 64);
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}
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virtual int shutdown() override
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{
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// Cleanup.
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bgfx::frame();
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cameraDestroy();
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imguiDestroy();
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bgfx::destroy(m_ibh);
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bgfx::destroy(m_vbh);
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bgfx::destroy(m_vt_unlit);
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bgfx::destroy(m_vt_mip);
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delete m_vti;
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delete m_vt;
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delete m_feedbackBuffer;
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// Shutdown bgfx.
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bgfx::shutdown();
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return 0;
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}
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bool update() override
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{
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if (!entry::processEvents(m_width, m_height, m_debug, m_reset, &m_mouseState))
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{
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imguiBeginFrame(
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m_mouseState.m_mx
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, m_mouseState.m_my
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, (m_mouseState.m_buttons[entry::MouseButton::Left] ? IMGUI_MBUT_LEFT : 0)
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| (m_mouseState.m_buttons[entry::MouseButton::Right] ? IMGUI_MBUT_RIGHT : 0)
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| (m_mouseState.m_buttons[entry::MouseButton::Middle] ? IMGUI_MBUT_MIDDLE : 0)
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, m_mouseState.m_mz
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, uint16_t(m_width)
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, uint16_t(m_height)
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);
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showExampleDialog(this);
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int64_t now = bx::getHPCounter();
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static int64_t last = now;
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const int64_t frameTime = now - last;
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last = now;
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const double freq = double(bx::getHPFrequency());
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const float deltaTime = float(frameTime / freq);
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float time = (float)((now - m_timeOffset) / freq);
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if ((BGFX_CAPS_TEXTURE_BLIT | BGFX_CAPS_TEXTURE_READ_BACK) != (bgfx::getCaps()->supported & (BGFX_CAPS_TEXTURE_BLIT | BGFX_CAPS_TEXTURE_READ_BACK)))
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{
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// When texture read-back or blit is not supported by GPU blink!
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bool blink = uint32_t(time*3.0f) & 1;
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bgfx::dbgTextPrintf(0, 0, blink ? 0x4f : 0x04, " Texture read-back and/or blit not supported by GPU. ");
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// Set view 0 default viewport.
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bgfx::setViewRect(0, 0, 0, uint16_t(m_width), uint16_t(m_height));
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// This dummy draw call is here to make sure that view 0 is cleared
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// if no other draw calls are submitted to view 0.
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bgfx::touch(0);
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}
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else
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{
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ImGui::SetNextWindowPos(
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ImVec2(m_width - m_width / 5.0f - 10.0f, 10.0f)
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, ImGuiCond_FirstUseEver
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);
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ImGui::SetNextWindowSize(
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ImVec2(m_width / 5.0f, m_height - 10.0f)
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, ImGuiCond_FirstUseEver
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);
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ImGui::Begin("Settings"
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, NULL
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, 0
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);
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//ImGui::SliderFloat("intensity", &m_intensity, 0.0f, 3.0f);
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auto showBorders = m_vt->isShowBoardersEnabled();
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if (ImGui::Checkbox("Show borders", &showBorders))
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{
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m_vt->enableShowBoarders(showBorders);
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}
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auto colorMipLevels = m_vt->isColorMipLevelsEnabled();
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if (ImGui::Checkbox("Color mip levels", &colorMipLevels))
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{
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m_vt->enableColorMipLevels(colorMipLevels);
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}
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auto uploadsperframe = m_vt->getUploadsPerFrame();
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if (ImGui::InputInt("Updates per frame", &uploadsperframe, 1, 2))
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{
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uploadsperframe = bx::clamp(uploadsperframe, 1, 100);
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m_vt->setUploadsPerFrame(uploadsperframe);
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}
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ImGui::ImageButton(m_vt->getAtlastTexture(), ImVec2(m_width / 5.0f - 16.0f, m_width / 5.0f - 16.0f));
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ImGui::ImageButton(bgfx::getTexture(m_feedbackBuffer->getFrameBuffer()), ImVec2(m_width / 5.0f - 16.0f, m_width / 5.0f - 16.0f));
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ImGui::End();
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// Update camera.
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cameraUpdate(deltaTime, m_mouseState, ImGui::MouseOverArea() );
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float view[16];
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cameraGetViewMtx(view);
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float proj[16];
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bx::mtxProj(proj, 60.0f, float(m_width) / float(m_height), 0.1f, 1000.0f, m_caps->homogeneousDepth);
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// Setup views
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for (uint16_t i = 0; i < 2; ++i)
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{
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uint16_t viewWidth = 0;
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uint16_t viewHeight = 0;
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// Setup pass, first pass is into mip-map feedback buffer, second pass is on screen
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if (i == 0)
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{
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bgfx::setViewFrameBuffer(i, m_feedbackBuffer->getFrameBuffer());
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viewWidth = uint16_t(m_feedbackBuffer->getWidth());
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viewHeight = uint16_t(m_feedbackBuffer->getHeight());
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}
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else
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{
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bgfx::FrameBufferHandle invalid = BGFX_INVALID_HANDLE;
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bgfx::setViewFrameBuffer(i, invalid);
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viewWidth = uint16_t(m_width);
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viewHeight = uint16_t(m_height);
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}
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bgfx::setViewRect(i, 0, 0, viewWidth, viewHeight);
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bgfx::setViewTransform(i, view, proj);
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float mtx[16];
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bx::mtxIdentity(mtx);
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// Set identity transform for draw call.
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bgfx::setTransform(mtx);
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// Set vertex and index buffer.
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bgfx::setVertexBuffer(0, m_vbh);
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bgfx::setIndexBuffer(m_ibh);
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// Set render states.
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bgfx::setState(0
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| BGFX_STATE_WRITE_RGB
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| BGFX_STATE_WRITE_A
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| BGFX_STATE_WRITE_Z
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| BGFX_STATE_DEPTH_TEST_LESS
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);
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// Set virtual texture uniforms
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m_vt->setUniforms();
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// Submit primitive for rendering to first pass (to feedback buffer, where mip levels and tile x/y will be rendered
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if (i == 0)
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{
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bgfx::submit(i, m_vt_mip);
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// Download previous frame feedback info
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m_feedbackBuffer->download();
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// Update and upload new requests
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m_vt->update(m_feedbackBuffer->getRequests(), 4);
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// Clear feedback
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m_feedbackBuffer->clear();
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// Copy new frame feedback buffer
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m_feedbackBuffer->copy(3);
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}
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else
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{
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// Submit primitive for rendering to second pass (to back buffer, where virtual texture page table and atlas will be used)
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bgfx::submit(i, m_vt_unlit);
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}
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}
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}
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imguiEndFrame();
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// Advance to next frame. Rendering thread will be kicked to
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// process submitted rendering primitives.
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bgfx::frame();
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return true;
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}
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return false;
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}
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bgfx::VertexBufferHandle m_vbh;
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bgfx::IndexBufferHandle m_ibh;
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bgfx::ProgramHandle m_vt_unlit;
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bgfx::ProgramHandle m_vt_mip;
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uint32_t m_width;
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uint32_t m_height;
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uint32_t m_debug;
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uint32_t m_reset;
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int32_t m_scrollArea;
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entry::MouseState m_mouseState;
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const bgfx::Caps* m_caps;
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int64_t m_timeOffset;
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bx::DefaultAllocator m_vtAllocator;
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vt::VirtualTextureInfo* m_vti;
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vt::VirtualTexture* m_vt;
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vt::FeedbackBuffer* m_feedbackBuffer;
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};
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} // namespace
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ENTRY_IMPLEMENT_MAIN(
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ExampleSVT
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, "40-svt"
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, "Sparse Virtual Textures."
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, "https://bkaradzic.github.io/bgfx/examples.html#svt"
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);
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