refactor sdf sample completely to show a big scrollable, rotable and scalable text
This commit is contained in:
Jeremie Roy
parent
748e2e395f
commit
3df72de750
@ -4,7 +4,6 @@
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*/
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#include "../common/common.h"
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#include <bgfx.h>
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#include <bx/timer.h>
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#include "../common/entry.h"
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@ -13,7 +12,12 @@
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#include "../common/processevents.h"
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#include "../common/font/font_manager.h"
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#include "../common/font/text_metrics.h"
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#include "../common/font/text_buffer_manager.h"
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#include "../common/imgui/imgui.h"
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#include <stdio.h>
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#include <string.h>
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inline void mtxTranslate(float* _result, float x, float y, float z)
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{
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@ -33,6 +37,56 @@ inline void mtxScale(float* _result, float x, float y, float z)
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_result[15] = 1.0f;
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}
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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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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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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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int _main_(int /*_argc*/, char** /*_argv*/)
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{
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uint32_t width = 1280;
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@ -55,35 +109,94 @@ int _main_(int /*_argc*/, char** /*_argv*/)
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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 times_tt = fontManager->loadTrueTypeFromFile("font/bleeding_cowboys.ttf");
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TrueTypeHandle font_tt = fontManager->loadTrueTypeFromFile("font/special_elite.ttf");//bleeding_cowboys.ttf");
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// Create a distance field font.
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FontHandle distance_font = fontManager->createFontByPixelSize(times_tt, 0, 48, FONT_TYPE_DISTANCE);
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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, scaled_font);
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uint32_t lineCount = metrics.getLineCount(bigText);
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float visibleLineCount = 20.0f;
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// Create a scalled down version of the same font (without adding
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// anything to the atlas).
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FontHandle smaller_font = fontManager->createScaledFontToPixelSize(distance_font, 32);
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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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// Preload glyph and generate (generate bitmap's).
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fontManager->preloadGlyph(distance_font, L"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.,\" \n");
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TextBufferHandle scrollableBuffer = textBufferManager->createTextBuffer(FONT_TYPE_DISTANCE, TRANSIENT);
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textBufferManager->setTextColor(scrollableBuffer, 0xFFFFFFFF);
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// You can unload the TTF files at this stage, but in that case, the
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// set of glyph's will be limited to the set of preloaded glyph.
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fontManager->unloadTrueType(times_tt);
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TextBufferHandle staticText = textBufferManager->createTextBuffer(FONT_TYPE_DISTANCE, STATIC);
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textBufferManager->setTextColor(staticText, 0xDD0000FF);
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textBufferManager->appendText(staticText, distance_font, L"BGFX ");
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textBufferManager->appendText(staticText, smaller_font, L"bgfx");
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int64_t timeOffset = bx::getHPCounter();
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while (!processEvents(width, height, debug, reset) )
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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, 300.0f , 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, 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, 0.2f, 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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@ -97,7 +210,6 @@ int _main_(int /*_argc*/, char** /*_argv*/)
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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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float time = (float)( (now - timeOffset) / double(bx::getHPFrequency() ) );
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// Use debug font to print information about this example.
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bgfx::dbgTextClear();
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@ -115,42 +227,50 @@ int _main_(int /*_argc*/, char** /*_argv*/)
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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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TextRectangle rect = textBufferManager->getRectangle(staticText);
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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 mtxA[16];
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float mtxB[16];
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float mtxC[16];
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mtxRotateZ(mtxA, time * 0.37f);
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mtxTranslate(mtxB, -(rect.width * 0.5f), -(rect.height * 0.5f), 0);
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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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mtxMul(mtxC, mtxB, mtxA);
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float scale = 4.1f + 4.0f * sinf(time);
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mtxScale(mtxA, scale, scale, 1.0f);
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mtxMul(mtxB, mtxC, mtxA);
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mtxTranslate(mtxC, ( (width) * 0.5f), ( (height) * 0.5f), 0);
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mtxMul(mtxA, mtxB, mtxC);
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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(mtxA);
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bgfx::setTransform(tmpMat3);
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// Draw your text.
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textBufferManager->submitTextBuffer(staticText, 0);
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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->unloadTrueType(font_tt);
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// Destroy the fonts.
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fontManager->destroyFont(distance_font);
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fontManager->destroyFont(smaller_font);
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fontManager->destroyFont(base_distance_font);
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fontManager->destroyFont(scaled_font);
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textBufferManager->destroyTextBuffer(staticText);
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textBufferManager->destroyTextBuffer(scrollableBuffer);
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delete textBufferManager;
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delete fontManager;
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