bgfx/examples/11-fontsdf/fontsdf.cpp
Hugo Amnov 79321ffce2
Replace freetype with stb_truetype in font examples (#2139)
* Replace freetype with stb_truetype in font example

* Remove freetype
2020-05-10 17:44:14 -07:00

292 lines
7.9 KiB
C++

/*
* Copyright 2013 Jeremie Roy. All rights reserved.
* License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
*/
#include "common.h"
#include "bgfx_utils.h"
#include <bgfx/bgfx.h>
#include <bx/timer.h>
#include <bx/math.h>
#include "font/font_manager.h"
#include "font/text_metrics.h"
#include "font/text_buffer_manager.h"
#include "imgui/imgui.h"
namespace
{
TrueTypeHandle loadTtf(FontManager* _fm, const char* _filePath)
{
uint32_t size;
void* data = load(_filePath, &size);
if (NULL != data)
{
TrueTypeHandle handle = _fm->createTtf( (uint8_t*)data, size);
BX_FREE(entry::getAllocator(), data);
return handle;
}
TrueTypeHandle invalid = BGFX_INVALID_HANDLE;
return invalid;
}
class ExampleFontSDF : public entry::AppI
{
public:
ExampleFontSDF(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_NONE;
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 debug text.
bgfx::setDebug(m_debug);
// Set view 0 clear state.
bgfx::setViewClear(0
, BGFX_CLEAR_COLOR | BGFX_CLEAR_DEPTH
, 0x303030ff
, 1.0f
, 0
);
// Initialize Imgui
// This initializes the same allocator used by stb_truetype, so must do that before creating the font manager
imguiCreate();
uint32_t size;
m_txtFile = load("text/sherlock_holmes_a_scandal_in_bohemia_arthur_conan_doyle.txt", &size);
m_bigText = bx::StringView( (const char*)m_txtFile, size);
// Init the text rendering system.
m_fontManager = new FontManager(512);
m_textBufferManager = new TextBufferManager(m_fontManager);
m_font = loadTtf(m_fontManager, "font/special_elite.ttf");
// Create a distance field font.
m_fontSdf = m_fontManager->createFontByPixelSize(m_font, 0, 48, FONT_TYPE_DISTANCE);
// Create a scaled down version of the same font (without adding anything to the atlas).
m_fontScaled = m_fontManager->createScaledFontToPixelSize(m_fontSdf, 14);
m_metrics = TextLineMetrics(m_fontManager->getFontInfo(m_fontScaled) );
m_lineCount = m_metrics.getLineCount(m_bigText);
m_visibleLineCount = 20.0f;
m_textBegin = 0;
m_textEnd = 0;
m_metrics.getSubText(m_bigText, 0, (uint32_t)m_visibleLineCount, m_textBegin, m_textEnd);
m_scrollableBuffer = m_textBufferManager->createTextBuffer(FONT_TYPE_DISTANCE, BufferType::Transient);
m_textBufferManager->setTextColor(m_scrollableBuffer, 0xFFFFFFFF);
m_textBufferManager->appendText(m_scrollableBuffer, m_fontScaled, m_textBegin, m_textEnd);
m_textScroll = 0.0f;
m_textRotation = 0.0f;
m_textScale = 1.0f;
m_textSize = 14.0f;
}
virtual int shutdown() override
{
imguiDestroy();
unload(m_txtFile);
m_fontManager->destroyTtf(m_font);
// Destroy the fonts.
m_fontManager->destroyFont(m_fontSdf);
m_fontManager->destroyFont(m_fontScaled);
m_textBufferManager->destroyTextBuffer(m_scrollableBuffer);
delete m_textBufferManager;
delete m_fontManager;
// 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);
ImGui::SetNextWindowPos(
ImVec2(m_width - m_width / 5.0f - 10.0f, 10.0f)
, ImGuiCond_FirstUseEver
);
ImGui::SetNextWindowSize(
ImVec2(m_width / 5.0f, m_height / 2.0f)
, ImGuiCond_FirstUseEver
);
ImGui::Begin("Settings"
, NULL
, 0
);
bool recomputeVisibleText = false;
recomputeVisibleText |= ImGui::SliderFloat("# of lines", &m_visibleLineCount, 1.0f, 177.0f);
if (ImGui::SliderFloat("Font size", &m_textSize, 6.0f, 64.0f) )
{
m_fontManager->destroyFont(m_fontScaled);
m_fontScaled = m_fontManager->createScaledFontToPixelSize(m_fontSdf, (uint32_t) m_textSize);
m_metrics = TextLineMetrics(m_fontManager->getFontInfo(m_fontScaled) );
recomputeVisibleText = true;
}
recomputeVisibleText |= ImGui::SliderFloat("Scroll", &m_textScroll, 0.0f, (m_lineCount-m_visibleLineCount));
ImGui::SliderFloat("Rotate", &m_textRotation, 0.0f, bx::kPi*2.0f);
recomputeVisibleText |= ImGui::SliderFloat("Scale", &m_textScale, 0.1f, 10.0f);
if (recomputeVisibleText)
{
m_textBufferManager->clearTextBuffer(m_scrollableBuffer);
m_metrics.getSubText(m_bigText,(uint32_t)m_textScroll, (uint32_t)(m_textScroll+m_visibleLineCount), m_textBegin, m_textEnd);
m_textBufferManager->appendText(m_scrollableBuffer, m_fontScaled, m_textBegin, m_textEnd);
}
ImGui::End();
imguiEndFrame();
// 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);
const bx::Vec3 at = { 0.0f, 0.0f, 0.0f };
const bx::Vec3 eye = { 0.0f, 0.0f, -1.0f };
float view[16];
bx::mtxLookAt(view, eye, at);
const float centering = 0.5f;
// Setup a top-left ortho matrix for screen space drawing.
const bgfx::Caps* caps = bgfx::getCaps();
{
float ortho[16];
bx::mtxOrtho(ortho, centering, m_width + centering, m_height + centering, centering, -1.0f, 1.0f, 0.0f, caps->homogeneousDepth);
bgfx::setViewTransform(0, view, ortho);
bgfx::setViewRect(0, 0, 0, uint16_t(m_width), uint16_t(m_height) );
}
//very crude approximation :(
float textAreaWidth = 0.5f * 66.0f * m_fontManager->getFontInfo(m_fontScaled).maxAdvanceWidth;
float textRotMat[16];
float textCenterMat[16];
float textScaleMat[16];
float screenCenterMat[16];
bx::mtxRotateZ(textRotMat, m_textRotation);
bx::mtxTranslate(textCenterMat, -(textAreaWidth * 0.5f), (-m_visibleLineCount)*m_metrics.getLineHeight()*0.5f, 0);
bx::mtxScale(textScaleMat, m_textScale, m_textScale, 1.0f);
bx::mtxTranslate(screenCenterMat, ( (m_width) * 0.5f), ( (m_height) * 0.5f), 0);
//first translate to text center, then scale, then rotate
float tmpMat[16];
bx::mtxMul(tmpMat, textCenterMat, textRotMat);
float tmpMat2[16];
bx::mtxMul(tmpMat2, tmpMat, textScaleMat);
float tmpMat3[16];
bx::mtxMul(tmpMat3, tmpMat2, screenCenterMat);
// Set model matrix for rendering.
bgfx::setTransform(tmpMat3);
// Draw your text.
m_textBufferManager->submitTextBuffer(m_scrollableBuffer, 0);
// Advance to next frame. Rendering thread will be kicked to
// process submitted rendering primitives.
bgfx::frame();
return true;
}
return false;
}
entry::MouseState m_mouseState;
uint32_t m_width;
uint32_t m_height;
uint32_t m_debug;
uint32_t m_reset;
void* m_txtFile;
bx::StringView m_bigText;
// Init the text rendering system.
FontManager* m_fontManager;
TextBufferManager* m_textBufferManager;
TrueTypeHandle m_font;
FontHandle m_fontSdf;
FontHandle m_fontScaled;
TextBufferHandle m_scrollableBuffer;
TextLineMetrics m_metrics = TextLineMetrics(FontInfo());
uint32_t m_lineCount;
float m_visibleLineCount;
const char* m_textBegin;
const char* m_textEnd;
float m_textScroll;
float m_textRotation;
float m_textScale;
float m_textSize;
};
} // namespace
ENTRY_IMPLEMENT_MAIN(
ExampleFontSDF
, "11-fontsdf"
, "Use a single distance field font to render text of various size."
, "https://bkaradzic.github.io/bgfx/examples.html#fontsdf"
);