301 lines
8.5 KiB
C++
301 lines
8.5 KiB
C++
/*
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* Copyright 2013 Jeremie Roy. All rights reserved.
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* License: https://github.com/bkaradzic/bgfx#license-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/math.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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namespace
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{
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TrueTypeHandle loadTtf(FontManager* _fm, const char* _filePath)
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{
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uint32_t size;
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void* data = load(_filePath, &size);
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if (NULL != data)
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{
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TrueTypeHandle handle = _fm->createTtf( (uint8_t*)data, size);
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BX_FREE(entry::getAllocator(), data);
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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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class ExampleFontSDF : public entry::AppI
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{
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public:
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ExampleFontSDF(const char* _name, const char* _description)
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: entry::AppI(_name, _description)
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{
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}
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void init(int32_t _argc, const char* const* _argv, uint32_t _width, uint32_t _height) override
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{
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Args args(_argc, _argv);
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m_width = _width;
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m_height = _height;
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m_debug = BGFX_DEBUG_NONE;
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m_reset = BGFX_RESET_VSYNC;
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bgfx::init(args.m_type, args.m_pciId);
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bgfx::reset(m_width, m_height, m_reset);
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// Enable debug text.
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bgfx::setDebug(m_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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m_bigText = (char*)load("text/sherlock_holmes_a_scandal_in_bohemia_arthur_conan_doyle.txt");
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// Init the text rendering system.
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m_fontManager = new FontManager(512);
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m_textBufferManager = new TextBufferManager(m_fontManager);
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m_font = loadTtf(m_fontManager, "font/special_elite.ttf");
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// Create a distance field font.
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m_fontSdf = m_fontManager->createFontByPixelSize(m_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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m_fontScaled = m_fontManager->createScaledFontToPixelSize(m_fontSdf, 14);
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m_metrics = TextLineMetrics(m_fontManager->getFontInfo(m_fontScaled) );
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m_lineCount = m_metrics.getLineCount(m_bigText);
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m_visibleLineCount = 20.0f;
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m_textBegin = 0;
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m_textEnd = 0;
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m_metrics.getSubText(m_bigText, 0, (uint32_t)m_visibleLineCount, m_textBegin, m_textEnd);
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m_scrollableBuffer = m_textBufferManager->createTextBuffer(FONT_TYPE_DISTANCE, BufferType::Transient);
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m_textBufferManager->setTextColor(m_scrollableBuffer, 0xFFFFFFFF);
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m_textBufferManager->appendText(m_scrollableBuffer, m_fontScaled, m_textBegin, m_textEnd);
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m_textScroll = 0.0f;
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m_textRotation = 0.0f;
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m_textScale = 1.0f;
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m_textSize = 14.0f;
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}
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virtual int shutdown() override
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{
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imguiDestroy();
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BX_FREE(entry::getAllocator(), m_bigText);
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m_fontManager->destroyTtf(m_font);
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// Destroy the fonts.
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m_fontManager->destroyFont(m_fontSdf);
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m_fontManager->destroyFont(m_fontScaled);
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m_textBufferManager->destroyTextBuffer(m_scrollableBuffer);
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delete m_textBufferManager;
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delete m_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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bool update() override
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{
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if (!entry::processEvents(m_width, m_height, m_debug, m_reset, &m_mouseState) )
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{
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imguiBeginFrame(m_mouseState.m_mx
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, m_mouseState.m_my
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, (m_mouseState.m_buttons[entry::MouseButton::Left ] ? IMGUI_MBUT_LEFT : 0)
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| (m_mouseState.m_buttons[entry::MouseButton::Right ] ? IMGUI_MBUT_RIGHT : 0)
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| (m_mouseState.m_buttons[entry::MouseButton::Middle] ? IMGUI_MBUT_MIDDLE : 0)
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, m_mouseState.m_mz
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, uint16_t(m_width)
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, uint16_t(m_height)
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);
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showExampleDialog(this);
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ImGui::SetNextWindowPos(
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ImVec2(m_width - m_width / 5.0f - 10.0f, 10.0f)
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, ImGuiCond_FirstUseEver
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);
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ImGui::SetNextWindowSize(
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ImVec2(m_width / 5.0f, m_height / 2.0f)
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, ImGuiCond_FirstUseEver
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);
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ImGui::Begin("Settings"
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, NULL
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, 0
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);
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bool recomputeVisibleText = false;
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recomputeVisibleText |= ImGui::SliderFloat("# of lines", &m_visibleLineCount, 1.0f, 177.0f);
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if (ImGui::SliderFloat("Font size", &m_textSize, 6.0f, 64.0f) )
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{
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m_fontManager->destroyFont(m_fontScaled);
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m_fontScaled = m_fontManager->createScaledFontToPixelSize(m_fontSdf, (uint32_t) m_textSize);
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m_metrics = TextLineMetrics(m_fontManager->getFontInfo(m_fontScaled) );
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recomputeVisibleText = true;
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}
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recomputeVisibleText |= ImGui::SliderFloat("Scroll", &m_textScroll, 0.0f, (m_lineCount-m_visibleLineCount));
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ImGui::SliderFloat("Rotate", &m_textRotation, 0.0f, bx::kPi*2.0f);
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recomputeVisibleText |= ImGui::SliderFloat("Scale", &m_textScale, 0.1f, 10.0f);
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if (recomputeVisibleText)
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{
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m_textBufferManager->clearTextBuffer(m_scrollableBuffer);
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m_metrics.getSubText(m_bigText,(uint32_t)m_textScroll, (uint32_t)(m_textScroll+m_visibleLineCount), m_textBegin, m_textEnd);
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m_textBufferManager->appendText(m_scrollableBuffer, m_fontScaled, m_textBegin, m_textEnd);
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}
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ImGui::End();
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imguiEndFrame();
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// Set view 0 default viewport.
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bgfx::setViewRect(0, 0, 0, uint16_t(m_width), uint16_t(m_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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float at[3] = { 0.0f, 0.0f, 0.0f };
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float eye[3] = { 0.0f, 0.0f, -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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const bgfx::Caps* caps = bgfx::getCaps();
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if (NULL != hmd
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&& 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, caps->homogeneousDepth);
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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 = m_width/4.0f;
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const float viewWidth = m_width/2.0f;
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bx::mtxOrtho(ortho[0], centering + viewOffset, centering + viewOffset + viewWidth, m_height + centering, centering, -1.0f, 1.0f, offset0, caps->homogeneousDepth);
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bx::mtxOrtho(ortho[1], centering + viewOffset, centering + viewOffset + viewWidth, m_height + centering, centering, -1.0f, 1.0f, offset1, caps->homogeneousDepth);
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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, m_width + centering, m_height + centering, centering, -1.0f, 1.0f, 0.0f, caps->homogeneousDepth);
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bgfx::setViewTransform(0, view, ortho);
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bgfx::setViewRect(0, 0, 0, uint16_t(m_width), uint16_t(m_height) );
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}
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//very crude approximation :(
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float textAreaWidth = 0.5f * 66.0f * m_fontManager->getFontInfo(m_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, m_textRotation);
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bx::mtxTranslate(textCenterMat, -(textAreaWidth * 0.5f), (-m_visibleLineCount)*m_metrics.getLineHeight()*0.5f, 0);
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bx::mtxScale(textScaleMat, m_textScale, m_textScale, 1.0f);
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bx::mtxTranslate(screenCenterMat, ( (m_width) * 0.5f), ( (m_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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m_textBufferManager->submitTextBuffer(m_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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return true;
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}
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return false;
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}
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entry::MouseState m_mouseState;
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uint32_t m_width;
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uint32_t m_height;
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uint32_t m_debug;
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uint32_t m_reset;
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char* m_bigText;
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// Init the text rendering system.
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FontManager* m_fontManager;
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TextBufferManager* m_textBufferManager;
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TrueTypeHandle m_font;
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FontHandle m_fontSdf;
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FontHandle m_fontScaled;
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TextBufferHandle m_scrollableBuffer;
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TextLineMetrics m_metrics = TextLineMetrics(FontInfo());
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uint32_t m_lineCount;
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float m_visibleLineCount;
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const char* m_textBegin;
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const char* m_textEnd;
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float m_textScroll;
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float m_textRotation;
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float m_textScale;
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float m_textSize;
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};
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} // namespace
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ENTRY_IMPLEMENT_MAIN(ExampleFontSDF, "11-fontsdf", "Use a single distance field font to render text of various size.");
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