mirror of
https://github.com/scratchfoundation/bgfx.git
synced 2024-11-29 19:15:37 -05:00
285 lines
8.2 KiB
C++
285 lines
8.2 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_utils.h"
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#include <bgfx/bgfx.h>
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#include <bx/timer.h>
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#include <bx/fpumath.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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static char* loadText(const char* _filePath)
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{
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FILE* file = fopen(_filePath, "rb");
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if (NULL != file)
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{
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uint32_t size = (uint32_t)fsize(file);
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char* mem = (char*)malloc(size+1);
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size_t ignore = fread(mem, 1, size, file);
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BX_UNUSED(ignore);
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fclose(file);
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mem[size-1] = '\0';
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return mem;
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}
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return NULL;
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}
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TrueTypeHandle loadTtf(FontManager* _fm, const char* _filePath)
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{
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FILE* file = fopen(_filePath, "rb");
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if (NULL != file)
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{
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uint32_t size = (uint32_t)fsize(file);
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uint8_t* mem = (uint8_t*)malloc(size+1);
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size_t ignore = fread(mem, 1, size, file);
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BX_UNUSED(ignore);
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fclose(file);
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mem[size-1] = '\0';
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TrueTypeHandle handle = _fm->createTtf(mem, size);
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free(mem);
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return handle;
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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 | BGFX_CLEAR_DEPTH
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, 0x303030ff
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, 1.0f
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, 0
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);
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// Imgui.
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imguiCreate();
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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 = loadTtf(fontManager, "font/special_elite.ttf");
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// Create a distance field font.
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FontHandle fontSdf = fontManager->createFontByPixelSize(font, 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 fontScaled = fontManager->createScaledFontToPixelSize(fontSdf, 14);
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TextLineMetrics metrics(fontManager->getFontInfo(fontScaled) );
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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, BufferType::Transient);
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textBufferManager->setTextColor(scrollableBuffer, 0xFFFFFFFF);
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textBufferManager->appendText(scrollableBuffer, fontScaled, textBegin, textEnd);
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entry::MouseState mouseState;
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int32_t scrollArea = 0;
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const int32_t guiPanelWidth = 250;
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const int32_t guiPanelHeight = 200;
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float textScroll = 0.0f;
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float textRotation = 0.0f;
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float textScale = 1.0f;
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float textSize = 14.0f;
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while (!entry::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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| (mouseState.m_buttons[entry::MouseButton::Middle] ? IMGUI_MBUT_MIDDLE : 0)
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, mouseState.m_mz
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, width
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, height
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);
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imguiBeginScrollArea("Text Area"
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, width - guiPanelWidth - 10
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, 10
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, guiPanelWidth
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, guiPanelHeight
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, &scrollArea
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);
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imguiSeparatorLine();
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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(fontScaled);
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fontScaled = fontManager->createScaledFontToPixelSize(fontSdf, (uint32_t) textSize);
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metrics = TextLineMetrics(fontManager->getFontInfo(fontScaled) );
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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, bx::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, fontScaled, 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::touch(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 print32_t 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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bx::mtxLookAt(view, eye, at);
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const float centering = 0.5f;
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// Setup a top-left ortho matrix for screen space drawing.
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const bgfx::HMD* hmd = bgfx::getHMD();
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if (NULL != hmd && 0 != (hmd->flags & BGFX_HMD_RENDERING) )
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{
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float proj[16];
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bx::mtxProj(proj, hmd->eye[0].fov, 0.1f, 100.0f);
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static float time = 0.0f;
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time += 0.05f;
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const float dist = 10.0f;
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const float offset0 = -proj[8] + (hmd->eye[0].viewOffset[0] / dist * proj[0]);
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const float offset1 = -proj[8] + (hmd->eye[1].viewOffset[0] / dist * proj[0]);
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float ortho[2][16];
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const float viewOffset = width/4.0f;
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const float viewWidth = width/2.0f;
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bx::mtxOrtho(ortho[0], centering + viewOffset, centering + viewOffset + viewWidth, height + centering, centering, -1.0f, 1.0f, offset0);
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bx::mtxOrtho(ortho[1], centering + viewOffset, centering + viewOffset + viewWidth, height + centering, centering, -1.0f, 1.0f, offset1);
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bgfx::setViewTransform(0, view, ortho[0], BGFX_VIEW_STEREO, ortho[1]);
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bgfx::setViewRect(0, 0, 0, hmd->width, hmd->height);
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}
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else
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{
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float ortho[16];
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bx::mtxOrtho(ortho, centering, width + centering, height + centering, centering, -1.0f, 1.0f);
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bgfx::setViewTransform(0, view, ortho);
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bgfx::setViewRect(0, 0, 0, width, height);
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}
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//very crude approximation :(
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float textAreaWidth = 0.5f * 66.0f * fontManager->getFontInfo(fontScaled).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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bx::mtxRotateZ(textRotMat, textRotation);
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bx::mtxTranslate(textCenterMat, -(textAreaWidth * 0.5f), (-visibleLineCount)*metrics.getLineHeight()*0.5f, 0);
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bx::mtxScale(textScaleMat, textScale, textScale, 1.0f);
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bx::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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bx::mtxMul(tmpMat, textCenterMat, textRotMat);
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float tmpMat2[16];
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bx::mtxMul(tmpMat2, tmpMat, textScaleMat);
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float tmpMat3[16];
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bx::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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imguiDestroy();
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free(bigText);
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fontManager->destroyTtf(font);
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// Destroy the fonts.
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fontManager->destroyFont(fontSdf);
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fontManager->destroyFont(fontScaled);
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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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