bgfx/examples/40-svt/svt.cpp

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/*
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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
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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
* - Mars texture
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* 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()
{
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ms_layout
.begin()
.add(bgfx::Attrib::Position, 3, bgfx::AttribType::Float)
.add(bgfx::Attrib::TexCoord0, 2, bgfx::AttribType::Float)
.end();
};
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static bgfx::VertexLayout ms_layout;
};
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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:
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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))
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, 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);
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// 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
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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)))
{
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// 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, ImGui::MouseOverArea() );
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;
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bx::DefaultAllocator m_vtAllocator;
vt::VirtualTextureInfo* m_vti;
vt::VirtualTexture* m_vt;
vt::FeedbackBuffer* m_feedbackBuffer;
};
} // namespace
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ENTRY_IMPLEMENT_MAIN(
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ExampleSVT
, "40-svt"
, "Sparse Virtual Textures."
, "https://bkaradzic.github.io/bgfx/examples.html#svt"
);