bgfx/examples/11-fontsdf/fontsdf.cpp
2013-05-29 21:53:19 -07:00

307 lines
8.1 KiB
C++

/*
* Copyright 2013 Jeremie Roy. All rights reserved.
* License: http://www.opensource.org/licenses/BSD-2-Clause
*/
#include "common.h"
#include <bgfx.h>
#include <bx/timer.h>
#include "entry.h"
#include "dbg.h"
#include "fpumath.h"
#include "processevents.h"
#include "font/font_manager.h"
#include "font/text_metrics.h"
#include "font/text_buffer_manager.h"
#include "imgui/imgui.h"
#include <stdio.h>
#include <string.h>
long int fsize(FILE* _file)
{
long int pos = ftell(_file);
fseek(_file, 0L, SEEK_END);
long int size = ftell(_file);
fseek(_file, pos, SEEK_SET);
return size;
}
char* loadText(const char* _textFile)
{
FILE* pFile;
pFile = fopen(_textFile, "rb");
if (pFile == NULL)
{
return NULL;
}
// Go to the end of the file.
if (fseek(pFile, 0L, SEEK_END) == 0)
{
// Get the size of the file.
long bufsize = ftell(pFile);
if (bufsize == -1)
{
fclose(pFile);
return NULL;
}
char* buffer = new char[bufsize];
// Go back to the start of the file.
fseek(pFile, 0L, SEEK_SET);
// Read the entire file into memory.
size_t newLen = fread( (void*)buffer, sizeof(char), bufsize, pFile);
if (newLen == 0)
{
fclose(pFile);
delete[] buffer;
return NULL;
}
fclose(pFile);
return buffer;
}
return NULL;
}
TrueTypeHandle loadTtf(FontManager* _fm, const char* _fontPath)
{
FILE* pFile;
pFile = fopen(_fontPath, "rb");
if (NULL != pFile)
{
if (0 == fseek(pFile, 0L, SEEK_END) )
{
// Get the size of the file.
long bufsize = ftell(pFile);
if (bufsize == -1)
{
fclose(pFile);
TrueTypeHandle invalid = BGFX_INVALID_HANDLE;
return invalid;
}
uint8_t* buffer = new uint8_t[bufsize];
// Go back to the start of the file.
fseek(pFile, 0L, SEEK_SET);
// Read the entire file into memory.
uint32_t newLen = fread( (void*)buffer, sizeof(char), bufsize, pFile);
if (newLen == 0)
{
fclose(pFile);
delete[] buffer;
TrueTypeHandle invalid = BGFX_INVALID_HANDLE;
return invalid;
}
fclose(pFile);
return _fm->createTtf(buffer, bufsize);
}
}
TrueTypeHandle invalid = BGFX_INVALID_HANDLE;
return invalid;
}
int _main_(int /*_argc*/, char** /*_argv*/)
{
uint32_t width = 1280;
uint32_t height = 720;
uint32_t debug = BGFX_DEBUG_TEXT;
uint32_t reset = BGFX_RESET_VSYNC;
bgfx::init();
bgfx::reset(width, height, reset);
// Enable debug text.
bgfx::setDebug(debug);
// Set view 0 clear state.
bgfx::setViewClear(0
, BGFX_CLEAR_COLOR_BIT | BGFX_CLEAR_DEPTH_BIT
, 0x303030ff
, 1.0f
, 0
);
FILE* file = fopen("font/droidsans.ttf", "rb");
uint32_t size = (uint32_t)fsize(file);
void* data = malloc(size);
size_t ignore = fread(data, 1, size, file);
BX_UNUSED(ignore);
fclose(file);
imguiCreate(data, size);
free(data);
char* bigText = loadText( "text/sherlock_holmes_a_scandal_in_bohemia_arthur_conan_doyle.txt");
// Init the text rendering system.
FontManager* fontManager = new FontManager(512);
TextBufferManager* textBufferManager = new TextBufferManager(fontManager);
TrueTypeHandle font_tt = loadTtf(fontManager, "font/special_elite.ttf");
// Create a distance field font.
FontHandle base_distance_font = fontManager->createFontByPixelSize(font_tt, 0, 48, FONT_TYPE_DISTANCE);
// Create a scaled down version of the same font (without adding anything to the atlas).
FontHandle scaled_font = fontManager->createScaledFontToPixelSize(base_distance_font, 14);
TextLineMetrics metrics(fontManager->getFontInfo(scaled_font) );
uint32_t lineCount = metrics.getLineCount(bigText);
float visibleLineCount = 20.0f;
const char* textBegin = 0;
const char* textEnd = 0;
metrics.getSubText(bigText, 0, (uint32_t)visibleLineCount, textBegin, textEnd);
TextBufferHandle scrollableBuffer = textBufferManager->createTextBuffer(FONT_TYPE_DISTANCE, TRANSIENT);
textBufferManager->setTextColor(scrollableBuffer, 0xFFFFFFFF);
textBufferManager->appendText(scrollableBuffer, scaled_font, textBegin, textEnd);
MouseState mouseState;
int32_t scrollArea = 0;
while (!processEvents(width, height, debug, reset, &mouseState) )
{
imguiBeginFrame(mouseState.m_mx
, mouseState.m_my
, (mouseState.m_buttons[entry::MouseButton::Left ] ? IMGUI_MBUT_LEFT : 0)
| (mouseState.m_buttons[entry::MouseButton::Right ] ? IMGUI_MBUT_RIGHT : 0)
, 0
, width
, height
);
const int guiPanelWidth = 250;
const int guiPanelHeight = 200;
imguiBeginScrollArea("Text Area", width - guiPanelWidth - 10, 10, guiPanelWidth, guiPanelHeight, &scrollArea);
imguiSeparatorLine();
static float textScroll = 0.0f;
static float textRotation = 0.0f;
static float textScale = 1.0f;
static float textSize = 14.0f;
bool recomputeVisibleText = false;
recomputeVisibleText |= imguiSlider("Number of lines", &visibleLineCount, 1.0f, 177.0f , 1.0f);
if(imguiSlider("Font size", &textSize, 6.0f, 64.0f , 1.0f))
{
fontManager->destroyFont(scaled_font);
scaled_font = fontManager->createScaledFontToPixelSize(base_distance_font, (uint32_t) textSize);
metrics = TextLineMetrics(fontManager->getFontInfo(scaled_font) );
recomputeVisibleText = true;
}
recomputeVisibleText |= imguiSlider("Scroll", &textScroll, 0.0f, (lineCount-visibleLineCount) , 1.0f);
imguiSlider("Rotate", &textRotation, 0.0f, (float) M_PI *2.0f , 0.1f);
recomputeVisibleText |= imguiSlider("Scale", &textScale, 0.1f, 10.0f , 0.1f);
if( recomputeVisibleText)
{
textBufferManager->clearTextBuffer(scrollableBuffer);
metrics.getSubText(bigText,(uint32_t)textScroll, (uint32_t)(textScroll+visibleLineCount), textBegin, textEnd);
textBufferManager->appendText(scrollableBuffer, scaled_font, textBegin, textEnd);
}
imguiEndScrollArea();
imguiEndFrame();
// Set view 0 default viewport.
bgfx::setViewRect(0, 0, 0, width, 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::submit(0);
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 double toMs = 1000.0 / freq;
// Use debug font to print information about this example.
bgfx::dbgTextClear();
bgfx::dbgTextPrintf(0, 1, 0x4f, "bgfx/examples/11-fontsdf");
bgfx::dbgTextPrintf(0, 2, 0x6f, "Description: Use a single distance field font to render text of various size.");
bgfx::dbgTextPrintf(0, 3, 0x0f, "Frame: % 7.3f[ms]", double(frameTime) * toMs);
float at[3] = { 0, 0, 0.0f };
float eye[3] = {0, 0, -1.0f };
float view[16];
float proj[16];
mtxLookAt(view, eye, at);
float centering = 0.5f;
// Setup a top-left ortho matrix for screen space drawing.
mtxOrtho(proj, centering, width + centering, height + centering, centering, -1.0f, 1.0f);
// Set view and projection matrix for view 0.
bgfx::setViewTransform(0, view, proj);
//very crude approximation :(
float textAreaWidth = 0.5f * 66.0f * fontManager->getFontInfo(scaled_font).maxAdvanceWidth;
float textRotMat[16];
float textCenterMat[16];
float textScaleMat[16];
float screenCenterMat[16];
mtxRotateZ(textRotMat, textRotation);
mtxTranslate(textCenterMat, -(textAreaWidth * 0.5f), (-visibleLineCount)*metrics.getLineHeight()*0.5f, 0);
mtxScale(textScaleMat, textScale, textScale, 1.0f);
mtxTranslate(screenCenterMat, ( (width) * 0.5f), ( (height) * 0.5f), 0);
//first translate to text center, then scale, then rotate
float tmpMat[16];
mtxMul(tmpMat, textCenterMat, textRotMat);
float tmpMat2[16];
mtxMul(tmpMat2, tmpMat, textScaleMat);
float tmpMat3[16];
mtxMul(tmpMat3, tmpMat2, screenCenterMat);
// Set model matrix for rendering.
bgfx::setTransform(tmpMat3);
// Draw your text.
textBufferManager->submitTextBuffer(scrollableBuffer, 0);
// Advance to next frame. Rendering thread will be kicked to
// process submitted rendering primitives.
bgfx::frame();
}
fontManager->destroyTtf(font_tt);
// Destroy the fonts.
fontManager->destroyFont(base_distance_font);
fontManager->destroyFont(scaled_font);
textBufferManager->destroyTextBuffer(scrollableBuffer);
delete textBufferManager;
delete fontManager;
// Shutdown bgfx.
bgfx::shutdown();
return 0;
}