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