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