Working on signed distance fields text rendering

interface/src/avatar/Avatar.cpp

@@ -913,7 +913,8 @@ void Avatar::setAttachmentData(const QVector<AttachmentData>& attachmentData) {
 
 void Avatar::setDisplayName(const QString& displayName) {
     AvatarData::setDisplayName(displayName);
-    _displayNameBoundingRect = textRenderer(DISPLAYNAME)->metrics().tightBoundingRect(displayName);
+    // FIXME need to find an alternate mechanism for this.
+    //_displayNameBoundingRect = textRenderer(DISPLAYNAME)->metrics().tightBoundingRect(displayName);
 }
 
 void Avatar::setBillboard(const QByteArray& billboard) {

libraries/render-utils/src/MatrixStack.cpp

@@ -0,0 +1,7 @@
+#include "MatrixStack.h"
+
+QMatrix4x4 fromGlm(const glm::mat4 & m) {
+  return QMatrix4x4(&m[0][0]).transposed();
+  return QMatrix4x4(&m[0][0]);
+}
+

libraries/render-utils/src/MatrixStack.h

@@ -0,0 +1,205 @@
+/************************************************************************************
+ 
+ Authors     :   Bradley Austin Davis <bdavis@saintandreas.org>
+ Copyright   :   Copyright Brad Davis. All Rights reserved.
+ 
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+ 
+ http://www.apache.org/licenses/LICENSE-2.0
+ 
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ 
+ ************************************************************************************/
+
+#pragma once
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+#include <glm/gtc/noise.hpp>
+#include <glm/gtc/epsilon.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <stack>
+#include <QMatrix4x4>
+
+
+class MatrixStack : public std::stack<glm::mat4> {
+
+public:
+
+  MatrixStack() {
+    push(glm::mat4());
+  }
+
+  explicit MatrixStack(const MatrixStack & other) {
+    *((std::stack<glm::mat4>*)this) = *((std::stack<glm::mat4>*)&other);
+  }
+
+  operator const glm::mat4 & () const {
+    return top();
+  }
+
+  MatrixStack & pop() {
+    std::stack<glm::mat4>::pop();
+    assert(!empty());
+    return *this;
+  }
+
+  MatrixStack & push() {
+    emplace(top());
+    return *this;
+  }
+
+  MatrixStack & identity() {
+    top() = glm::mat4();
+    return *this;
+  }
+
+  MatrixStack & push(const glm::mat4 & mat) {
+    std::stack<glm::mat4>::push(mat);
+    return *this;
+  }
+
+  MatrixStack & rotate(const glm::mat3 & rotation) {
+    return postMultiply(glm::mat4(rotation));
+  }
+
+  MatrixStack & rotate(const glm::quat & rotation) {
+    return postMultiply(glm::mat4_cast(rotation));
+  }
+
+  MatrixStack & rotate(float theta, const glm::vec3 & axis) {
+    return postMultiply(glm::rotate(glm::mat4(), theta, axis));
+  }
+
+  MatrixStack & translate(float translation) {
+    return translate(glm::vec3(translation, 0, 0));
+  }
+
+  MatrixStack & translate(const glm::vec2 & translation) {
+    return translate(glm::vec3(translation, 0));
+  }
+
+  MatrixStack & translate(const glm::vec3 & translation) {
+    return postMultiply(glm::translate(glm::mat4(), translation));
+  }
+
+  MatrixStack & preTranslate(const glm::vec3 & translation) {
+    return preMultiply(glm::translate(glm::mat4(), translation));
+  }
+
+
+  MatrixStack & scale(float factor) {
+    return scale(glm::vec3(factor));
+  }
+
+  MatrixStack & scale(const glm::vec3 & scale) {
+    return postMultiply(glm::scale(glm::mat4(), scale));
+  }
+
+  MatrixStack & transform(const glm::mat4 & xfm) {
+    return postMultiply(xfm);
+  }
+
+  MatrixStack & preMultiply(const glm::mat4 & xfm) {
+    top() = xfm * top();
+    return *this;
+  }
+
+  MatrixStack & postMultiply(const glm::mat4 & xfm) {
+    top() *= xfm;
+    return *this;
+  }
+
+  // Remove the rotation component of a matrix.  useful for billboarding
+  MatrixStack & unrotate() {
+    glm::quat inverse = glm::inverse(glm::quat_cast(top()));
+    top() = top() * glm::mat4_cast(inverse);
+    return *this;
+  }
+
+  // Remove the translation component of a matrix.  useful for skyboxing
+  MatrixStack & untranslate() {
+    top()[3] = glm::vec4(0, 0, 0, 1);
+    return *this;
+  }
+
+  template <typename Function>
+  void withPush(Function f) {
+    size_t startingDepth = size();
+    push();
+    f();
+    pop();
+    assert(startingDepth = size());
+  }
+
+  template <typename Function>
+  void withIdentity(Function f) {
+    withPush([&] {
+      identity();
+      f();
+    });
+  }
+
+  static MatrixStack & projection() {
+    static MatrixStack projection;
+    return projection;
+  }
+
+  static MatrixStack & modelview() {
+    static MatrixStack modelview;
+    return modelview;
+  }
+
+  template <typename Function>
+  static void withPushAll(Function f) {
+    withPush(projection(), modelview(), f);
+  }
+
+  template <typename Function>
+  static void withIdentityAll(Function f) {
+    withPush(projection(), modelview(), [=] {
+      projection().identity();
+      modelview().identity();
+      f();
+    });
+  }
+
+  template <typename Function>
+  static void withPush(MatrixStack & stack, Function f) {
+    stack.withPush(f);
+  }
+
+  template <typename Function>
+  static void withPush(MatrixStack & stack1, MatrixStack & stack2, Function f) {
+    stack1.withPush([&]{
+      stack2.withPush(f);
+    });
+  }
+
+  template <typename Function> 
+  static void withGlMatrices(Function f) {
+    // Push the current stack, and then copy the values out of OpenGL
+    withPushAll([&] {
+      // Fetch the current matrices out of GL stack
+      // FIXME, eliminate the usage of deprecated GL
+      MatrixStack & mv = MatrixStack::modelview();
+      MatrixStack & pr = MatrixStack::projection();
+      glm::mat4 & mvm = mv.top();
+      glGetFloatv(GL_MODELVIEW_MATRIX, &(mvm[0][0]));
+
+      glm::mat4 & prm = pr.top();
+      glGetFloatv(GL_PROJECTION_MATRIX, &(prm[0][0]));
+      f();
+    });
+  }
+
+};
+
+QMatrix4x4 fromGlm(const glm::mat4 & m);
+

libraries/render-utils/src/TextRenderer.cpp

@@ -9,32 +9,93 @@
 //  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
 //
 
-#include <gpu/GPUConfig.h>
+#include "TextRenderer.h"
+#include "MatrixStack.h"
 
+#include <gpu/GPUConfig.h>
 #include <QApplication>
-#include <QDesktopWidget>
-#include <QFont>
-#include <QPaintEngine>
 #include <QtDebug>
 #include <QString>
 #include <QStringList>
-#include <QWindow>
+#include <QBuffer>
+#include <QFile>
 
-#include "TextRenderer.h"
-
-#include "glm/glm.hpp"
+#include <glm/glm.hpp>
 #include <glm/gtc/matrix_transform.hpp>
 
 #include "gpu/GLBackend.h"
 #include "gpu/Stream.h"
+#include "FontInconsolataMedium.h"
+#include "FontRoboto.h"
+#include "FontJackInput.h"
+#include "FontTimeless.h"
 
+namespace Shaders {
+  // Normally we could use 'enum class' to avoid namespace pollution,
+  // but we want easy conversion to GLuint
+  namespace Attributes {
+    enum {
+      Position = 0,
+      TexCoord = 1,
+    };
+  };
+}
 
-// the width/height of the cached glyph textures
-const int IMAGE_SIZE = 512;
+const char TextRenderer::SHADER_TEXT_VS[] = R"XXXX(#version 330
+
+uniform mat4 Projection = mat4(1);
+uniform mat4 ModelView = mat4(1);
+
+layout(location = 0) in vec3 Position;
+layout(location = 1) in vec2 TexCoord;
+
+out vec2 vTexCoord;
+
+void main() {
+  vTexCoord = TexCoord;
+  gl_Position = Projection * ModelView * vec4(Position, 1);
+})XXXX";
+
+const char TextRenderer::SHADER_TEXT_FS[] = R"XXXX(#version 330
+
+uniform sampler2D Font;
+uniform vec4 Color;
+
+in vec2 vTexCoord;
+out vec4 FragColor;
+
+const float gamma = 2.6;
+const float smoothing = 100.0;
+
+void main() {
+  FragColor = vec4(1);
+ 
+  // retrieve signed distance
+  float sdf = texture(Font, vTexCoord).r;
+
+  // perform adaptive anti-aliasing of the edges
+  // The larger we're rendering, the less anti-aliasing we need
+  float s = smoothing * length(fwidth(vTexCoord));
+  float w = clamp( s, 0.0, 0.5);
+  float a = smoothstep(0.5 - w, 0.5 + w, sdf);
+
+  // gamma correction for linear attenuation
+  a = pow(a, 1.0 / gamma);
+
+  if (a < 0.001) {
+    discard;
+  }
+
+  // final color
+  FragColor = vec4(Color.rgb, a);
+})XXXX";
+
+const float TextRenderer::DTP_TO_METERS = 0.003528f;
+const float TextRenderer::METERS_TO_DTP = 1.0f / TextRenderer::DTP_TO_METERS;
 
 static uint qHash(const TextRenderer::Properties& key, uint seed = 0) {
     // can be switched to qHash(key.font, seed) when we require Qt 5.3+
-    return qHash(key.font.family(), qHash(key.font.pointSize(), seed));
+    return qHash(key.font);
 }
 
 static bool operator==(const TextRenderer::Properties& p1, const TextRenderer::Properties& p2) {
@@ -43,7 +104,7 @@ static bool operator==(const TextRenderer::Properties& p1, const TextRenderer::P
 
 TextRenderer* TextRenderer::getInstance(const char* family, int pointSize, int weight, bool italic,
         EffectType effect, int effectThickness, const QColor& color) {
-    Properties properties = { QFont(family, pointSize, weight, italic), effect, effectThickness, color };
+    Properties properties = { QString(family), effect, effectThickness, color };
     TextRenderer*& instance = _instances[properties];
     if (!instance) {
         instance = new TextRenderer(properties);
@@ -51,18 +112,43 @@ TextRenderer* TextRenderer::getInstance(const char* family, int pointSize, int w
     return instance;
 }
 
+
+
+TextRenderer::TextRenderer(const Properties& properties) :
+  _effectType(properties.effect),
+  _effectThickness(properties.effectThickness),
+  _rowHeight(0),
+  _color(properties.color) {
+
+  QBuffer buffer;
+  if (properties.font == MONO_FONT_FAMILY) {
+    buffer.setData((const char*)SDFF_JACKINPUT, sizeof(SDFF_JACKINPUT));
+  } else if (properties.font == INCONSOLATA_FONT_FAMILY) {
+    buffer.setData((const char*)SDFF_INCONSOLATA_MEDIUM, sizeof(SDFF_INCONSOLATA_MEDIUM));
+  } else if (properties.font == SANS_FONT_FAMILY) {
+    buffer.setData((const char*)SDFF_ROBOTO, sizeof(SDFF_ROBOTO));
+  } else {
+    buffer.setData((const char*)SDFF_TIMELESS, sizeof(SDFF_TIMELESS));
+  }
+  buffer.open(QIODevice::ReadOnly);
+  read(buffer);
+}
+
+
 TextRenderer::~TextRenderer() {
-    glDeleteTextures(_allTextureIDs.size(), _allTextureIDs.constData());
 }
 
-int TextRenderer::calculateHeight(const char* str) {
+const TextRenderer::Glyph & TextRenderer::getGlyph(const QChar & c) const {
+  if (!_glyphs.contains(c)) {
+    return _glyphs[QChar('?')];
+  }
+  return _glyphs[c];
+};
+
+int TextRenderer::calculateHeight(const char* str) const {
     int maxHeight = 0;
     for (const char* ch = str; *ch != 0; ch++) {
         const Glyph& glyph = getGlyph(*ch);
-        if (glyph.textureID() == 0) {
-            continue;
-        }
-        
         if (glyph.bounds().height() > maxHeight) {
             maxHeight = glyph.bounds().height();
         }
@@ -70,258 +156,371 @@ int TextRenderer::calculateHeight(const char* str) {
     return maxHeight;
 }
 
-int TextRenderer::draw(int x, int y, const char* str, const glm::vec4& color) {
-    int compactColor = ((int(color.x * 255.0f) & 0xFF)) |
-                       ((int(color.y * 255.0f) & 0xFF) << 8) |
-                       ((int(color.z * 255.0f) & 0xFF) << 16) |
-                       ((int(color.w * 255.0f) & 0xFF) << 24);
 
-    int maxHeight = 0;
-    for (const char* ch = str; *ch != 0; ch++) {
-        const Glyph& glyph = getGlyph(*ch);
-        if (glyph.textureID() == 0) {
-            x += glyph.width();
-            continue;
-        }
-        
-        if (glyph.bounds().height() > maxHeight) {
-            maxHeight = glyph.bounds().height();
-        }
-        //glBindTexture(GL_TEXTURE_2D, glyph.textureID());
-
-        int left = x + glyph.bounds().x();
-        int right = x + glyph.bounds().x() + glyph.bounds().width();
-        int bottom = y + glyph.bounds().y();
-        int top = y + glyph.bounds().y() + glyph.bounds().height();
-
-        glm::vec2  leftBottom = glm::vec2(float(left), float(bottom));
-        glm::vec2  rightTop = glm::vec2(float(right), float(top));
-
-        float scale = QApplication::desktop()->windowHandle()->devicePixelRatio() / IMAGE_SIZE;
-        float ls = glyph.location().x() * scale;
-        float rs = (glyph.location().x() + glyph.bounds().width()) * scale;
-        float bt = glyph.location().y() * scale;
-        float tt = (glyph.location().y() + glyph.bounds().height()) * scale;
-
-        const int NUM_COORDS_SCALARS_PER_GLYPH = 16;
-        float vertexBuffer[NUM_COORDS_SCALARS_PER_GLYPH] = {    leftBottom.x, leftBottom.y, ls, bt,
-                                                        rightTop.x, leftBottom.y, rs, bt,
-                                                        rightTop.x, rightTop.y, rs, tt,
-                                                        leftBottom.x, rightTop.y, ls, tt, };
-
-        const int NUM_COLOR_SCALARS_PER_GLYPH = 4;
-        int colorBuffer[NUM_COLOR_SCALARS_PER_GLYPH] = { compactColor, compactColor, compactColor, compactColor };
-
-        gpu::Buffer::Size offset = sizeof(vertexBuffer) * _numGlyphsBatched;
-        gpu::Buffer::Size colorOffset = sizeof(colorBuffer) * _numGlyphsBatched;
-        if ((offset + sizeof(vertexBuffer)) > _glyphsBuffer->getSize()) {
-            _glyphsBuffer->append(sizeof(vertexBuffer), (gpu::Buffer::Byte*) vertexBuffer);
-            _glyphsColorBuffer->append(sizeof(colorBuffer), (gpu::Buffer::Byte*) colorBuffer);
-        } else {
-            _glyphsBuffer->setSubData(offset, sizeof(vertexBuffer), (gpu::Buffer::Byte*) vertexBuffer);
-            _glyphsColorBuffer->setSubData(colorOffset, sizeof(colorBuffer), (gpu::Buffer::Byte*) colorBuffer);
-        }
-        _numGlyphsBatched++;
-
-        x += glyph.width();
-    }
-
-    // TODO: remove these calls once we move to a full batched rendering of the text, for now, one draw call per draw() function call
-    drawBatch();
-    clearBatch();
-
-    return maxHeight;
+template <class T>
+void readStream(QIODevice & in, T & t) {
+  in.read((char*)&t, sizeof(t));
 }
 
-int TextRenderer::computeWidth(char ch)
+template <typename T, size_t N>
+void readStream(T(&t)[N]) {
+  in.read((char*)t, N);
+}
+
+void TextRenderer::read(const QString & path) {
+  QFile file(path);
+  file.open(QFile::ReadOnly);
+  read(file);
+}
+
+void TextRenderer::Glyph::read(QIODevice & in) {
+  uint16_t charcode;
+  readStream(in, charcode);
+  c = charcode;
+  readStream(in, ul);
+  readStream(in, size);
+  readStream(in, offset);
+  readStream(in, d);
+  lr = ul + size;
+}
+
+void TextRenderer::read(QIODevice & in) {
+  uint8_t header[4];
+  readStream(in, header);
+  if (memcmp(header, "SDFF", 4)) {
+    qFatal("Bad SDFF file");
+  }
+
+  uint16_t version;
+  readStream(in, version);
+
+  // read font name
+  _family = "";
+  if (version > 0x0001) {
+    char c;
+    readStream(in, c);
+    while (c) {
+      _family += c;
+      readStream(in, c);
+    }
+  }
+
+  // read font data
+  readStream(in, _leading);
+  readStream(in, _ascent);
+  readStream(in, _descent);
+  readStream(in, _spaceWidth);
+  _fontSize = _ascent + _descent;
+
+  // read metrics data
+  _glyphs.clear();
+
+  uint16_t count;
+  readStream(in, count);
+
+  for (int i = 0; i < count; ++i) {
+    Glyph g;
+    g.read(in);
+    _glyphs[g.c] = g;
+  }
+
+  // read image data
+  if (!_image.loadFromData(in.readAll(), "PNG")) {
+    qFatal("Failed to read SDFF image");
+  }
+  setupGL();
+}
+
+struct TextureVertex {
+  glm::vec2 pos;
+  glm::vec2 tex;
+  TextureVertex() {
+  }
+  TextureVertex(const glm::vec2 & pos, const glm::vec2 & tex)
+    : pos(pos), tex(tex) {
+  }
+  TextureVertex(const QPointF & pos, const QPointF & tex)
+    : pos(pos.x(), pos.y()), tex(tex.x(), tex.y()) {
+  }
+};
+
+struct QuadBuilder {
+  TextureVertex vertices[4];
+  QuadBuilder(const QRectF & r, const QRectF & tr) {
+    vertices[0] = TextureVertex(r.bottomLeft(), tr.topLeft());
+    vertices[1] = TextureVertex(r.bottomRight(), tr.topRight());
+    vertices[2] = TextureVertex(r.topRight(), tr.bottomRight());
+    vertices[3] = TextureVertex(r.topLeft(), tr.bottomLeft());
+  }
+};
+
+QRectF glmToRect(const glm::vec2 & pos, const glm::vec2 & size) {
+  QRectF result(pos.x, pos.y, size.x, size.y);
+  return result;
+}
+
+glm::uvec2 toGlm(const QSize & size) {
+  return glm::uvec2(size.width(), size.height());
+}
+
+QRectF TextRenderer::Glyph::bounds() const {
+  return glmToRect(offset, size);
+}
+
+QRectF TextRenderer::Glyph::textureBounds(const glm::vec2 & textureSize) const {
+  glm::vec2 pos = ul;
+  glm::vec2 size = lr - ul;
+  pos /= textureSize;
+  size /= textureSize;
+  return glmToRect(pos, size);
+}
+
+void TextRenderer::setupGL() {
+  _texture = TexturePtr(new QOpenGLTexture(_image, QOpenGLTexture::DontGenerateMipMaps));
+  _program = ProgramPtr(new QOpenGLShaderProgram()); 
+  if (!_program->create()) {
+    qFatal("Could not create text shader");
+  }
+  if (
+    !_program->addShaderFromSourceCode(QOpenGLShader::Vertex, SHADER_TEXT_VS) ||
+    !_program->addShaderFromSourceCode(QOpenGLShader::Fragment, SHADER_TEXT_FS) ||
+    !_program->link()) {
+    qFatal(_program->log().toLocal8Bit().constData());
+  }
+
+  std::vector<TextureVertex> vertexData;
+  std::vector<GLuint> indexData;
+  vertexData.reserve(_glyphs.size() * 4);
+  std::for_each(_glyphs.begin(), _glyphs.end(), [&](Glyph & m){
+    GLuint index = (GLuint)vertexData.size();
+
+    QRectF bounds = m.bounds();
+    QRectF texBounds = m.textureBounds(toGlm(_image.size()));
+    QuadBuilder qb(bounds, texBounds);
+    for (int i = 0; i < 4; ++i) {
+      vertexData.push_back(qb.vertices[i]);
+    }
+
+    m.indexOffset = indexData.size() * sizeof(GLuint);
+    // FIXME use triangle strips + primitive restart index
+    indexData.push_back(index + 0);
+    indexData.push_back(index + 1);
+    indexData.push_back(index + 2);
+    indexData.push_back(index + 0);
+    indexData.push_back(index + 2);
+    indexData.push_back(index + 3);
+  });
+
+  //_vao = VertexArrayPtr(new VertexArray());
+  _vao = VertexArrayPtr(new QOpenGLVertexArrayObject());
+  _vao->create();
+  _vao->bind();
+
+
+  _vertices = BufferPtr(new QOpenGLBuffer(QOpenGLBuffer::VertexBuffer));
+  _vertices->create();
+  _vertices->bind();
+  _vertices->allocate(&vertexData[0], sizeof(TextureVertex) * vertexData.size());
+
+  _indices = BufferPtr(new QOpenGLBuffer(QOpenGLBuffer::IndexBuffer));
+  _indices->create();
+  _indices->bind();
+  _indices->allocate(&indexData[0], sizeof(GLuint) * indexData.size());
+
+  GLsizei stride = (GLsizei)sizeof(TextureVertex);
+  void* offset = (void*)offsetof(TextureVertex, tex);
+
+  glEnableVertexAttribArray(Shaders::Attributes::Position);
+  glVertexAttribPointer(Shaders::Attributes::Position, 3, GL_FLOAT, false, stride, nullptr);
+  glEnableVertexAttribArray(Shaders::Attributes::TexCoord);
+  glVertexAttribPointer(Shaders::Attributes::TexCoord, 2, GL_FLOAT, false, stride, offset);
+  _vao->release();
+}
+
+int TextRenderer::computeWidth(const QChar & ch) const
 {
     return getGlyph(ch).width();
 }
 
-int TextRenderer::computeWidth(const char* str)
+int TextRenderer::computeWidth(const QString & str) const
 {
     int width = 0;
-    for (const char* ch = str; *ch != 0; ch++) {
-        width += computeWidth(*ch);
+    foreach(QChar c, str) {
+        width += computeWidth(c);
     }
     return width;
 }
 
-TextRenderer::TextRenderer(const Properties& properties) :
-    _font(properties.font),
-    _metrics(_font),
-    _effectType(properties.effect),
-    _effectThickness(properties.effectThickness),
-    _x(IMAGE_SIZE),
-    _y(IMAGE_SIZE),
-    _rowHeight(0),
-    _color(properties.color),
-    _glyphsBuffer(new gpu::Buffer()),
-    _glyphsColorBuffer(new gpu::Buffer()),
-    _glyphsStreamFormat(new gpu::Stream::Format()),
-    _glyphsStream(new gpu::BufferStream()),
-    _numGlyphsBatched(0)
-{
-    _glyphsStreamFormat->setAttribute(gpu::Stream::POSITION, 0, gpu::Element(gpu::VEC2, gpu::FLOAT, gpu::XYZ), 0);
-    const int NUM_POS_COORDS = 2;
-    const int VERTEX_TEXCOORD_OFFSET = NUM_POS_COORDS * sizeof(float);
-    _glyphsStreamFormat->setAttribute(gpu::Stream::TEXCOORD, 0, gpu::Element(gpu::VEC2, gpu::FLOAT, gpu::UV), VERTEX_TEXCOORD_OFFSET);
-
-    _glyphsStreamFormat->setAttribute(gpu::Stream::COLOR, 1, gpu::Element(gpu::VEC4, gpu::UINT8, gpu::RGBA));
-
-    _glyphsStream->addBuffer(_glyphsBuffer, 0, _glyphsStreamFormat->getChannels().at(0)._stride);
-    _glyphsStream->addBuffer(_glyphsColorBuffer, 0, _glyphsStreamFormat->getChannels().at(1)._stride);
-
-    _font.setKerning(false);
+int TextRenderer::computeWidth(const char * str) const {
+  int width = 0;
+  while (*str) {
+    width += computeWidth(*str++);
+  }
+  return width;
 }
 
-const Glyph& TextRenderer::getGlyph(char c) {
-    Glyph& glyph = _glyphs[c];
-    if (glyph.isValid()) {
-        return glyph;
-    }
-    // we use 'J' as a representative size for the solid block character
-    QChar ch = (c == SOLID_BLOCK_CHAR) ? QChar('J') : QChar(c);
-    QRect baseBounds = _metrics.boundingRect(ch);
-    if (baseBounds.isEmpty()) {
-        glyph = Glyph(0, QPoint(), QRect(), _metrics.width(ch));
-        return glyph;
-    }
-    // grow the bounds to account for effect, if any
-    if (_effectType == SHADOW_EFFECT) {
-        baseBounds.adjust(-_effectThickness, 0, 0, _effectThickness);
-    
-    } else if (_effectType == OUTLINE_EFFECT) {
-        baseBounds.adjust(-_effectThickness, -_effectThickness, _effectThickness, _effectThickness);
-    }
-    
-    // grow the bounds to account for antialiasing
-    baseBounds.adjust(-1, -1, 1, 1);
-    
-    // adjust bounds for device pixel scaling
-    float ratio = QApplication::desktop()->windowHandle()->devicePixelRatio();
-    QRect bounds(baseBounds.x() * ratio, baseBounds.y() * ratio, baseBounds.width() * ratio, baseBounds.height() * ratio);
-    
-    if (_x + bounds.width() > IMAGE_SIZE) {
-        // we can't fit it on the current row; move to next
-        _y += _rowHeight;
-        _x = _rowHeight = 0;
-    }
-    if (_y + bounds.height() > IMAGE_SIZE) {
-        // can't fit it on current texture; make a new one
-        glGenTextures(1, &_currentTextureID);
-        _x = _y = _rowHeight = 0;
-        
-        glBindTexture(GL_TEXTURE_2D, _currentTextureID);
-        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, IMAGE_SIZE, IMAGE_SIZE, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
-        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-        _allTextureIDs.append(_currentTextureID);
-           
-    } else {
-        glBindTexture(GL_TEXTURE_2D, _currentTextureID);
-    }
-    // render the glyph into an image and copy it into the texture
-    QImage image(bounds.width(), bounds.height(), QImage::Format_ARGB32);
-    if (c == SOLID_BLOCK_CHAR) {
-        image.fill(_color);
-    
-    } else {
-        image.fill(0);
-        QPainter painter(&image);
-        QFont font = _font;
-        if (ratio == 1.0f) {
-            painter.setFont(_font);
-        } else {
-            QFont enlargedFont = _font;
-            enlargedFont.setPointSize(_font.pointSize() * ratio);
-            painter.setFont(enlargedFont);
-        }
-        if (_effectType == SHADOW_EFFECT) {
-            for (int i = 0; i < _effectThickness * ratio; i++) {
-                painter.drawText(-bounds.x() - 1 - i, -bounds.y() + 1 + i, ch);
-            }
-        } else if (_effectType == OUTLINE_EFFECT) {
-            QPainterPath path;
-            QFont font = _font;
-            font.setStyleStrategy(QFont::ForceOutline);
-            path.addText(-bounds.x() - 0.5, -bounds.y() + 0.5, font, ch);
-            QPen pen;
-            pen.setWidth(_effectThickness * ratio);
-            pen.setJoinStyle(Qt::RoundJoin);
-            pen.setCapStyle(Qt::RoundCap);
-            painter.setPen(pen);
-            painter.setRenderHint(QPainter::Antialiasing);
-            painter.drawPath(path);
-        }
-        painter.setPen(_color);
-        painter.drawText(-bounds.x(), -bounds.y(), ch);
-    }    
-    glTexSubImage2D(GL_TEXTURE_2D, 0, _x, _y, bounds.width(), bounds.height(), GL_RGBA, GL_UNSIGNED_BYTE, image.constBits());
-       
-    glyph = Glyph(_currentTextureID, QPoint(_x / ratio, _y / ratio), baseBounds, _metrics.width(ch));
-    _x += bounds.width();
-    _rowHeight = qMax(_rowHeight, bounds.height());
-    
-    glBindTexture(GL_TEXTURE_2D, 0);
-    return glyph;
-}
-
-void TextRenderer::drawBatch() {
-    if (_numGlyphsBatched <= 0) {
-        return;
-    }
-
-    // TODO: Right now the drawBatch is called while calling the draw() function but in the future we'll need to apply the correct transform stack
-    /*
-    GLint matrixMode;
-    glGetIntegerv(GL_MATRIX_MODE, &matrixMode);
-
-    glMatrixMode(GL_MODELVIEW);
-    glPushMatrix();
-    glLoadIdentity();
-
-    glMatrixMode(GL_PROJECTION);
-    glPushMatrix();
-    glLoadIdentity();
-    */
-
-    gpu::Batch batch;
-
-    glEnable(GL_TEXTURE_2D);
-    // TODO: Apply the correct font atlas texture, for now only one texture per TextRenderer so it should be good
-    glBindTexture(GL_TEXTURE_2D, _currentTextureID);
-
-    batch.setInputFormat(_glyphsStreamFormat);
-    batch.setInputStream(0, *_glyphsStream);
-    batch.draw(gpu::QUADS, _numGlyphsBatched * 4, 0);
-
-    gpu::GLBackend::renderBatch(batch);
-
-    glDisableClientState(GL_VERTEX_ARRAY);
-    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
-    glDisableClientState(GL_COLOR_ARRAY);
-
-    glBindBuffer(GL_ARRAY_BUFFER, 0);
-
-    glBindTexture(GL_TEXTURE_2D, 0);
-    glDisable(GL_TEXTURE_2D);
-
-    // TODO: Right now the drawBatch is called while calling the draw() function but in the future we'll need to apply the correct transform stack
-    /*
-    glPopMatrix();
-    glMatrixMode(GL_MODELVIEW);
-    glPopMatrix();
-    glMatrixMode(matrixMode);
-    */
-}
-
-void TextRenderer::clearBatch() {
-    _numGlyphsBatched = 0;
+int TextRenderer::computeWidth(char ch) const {
+  return computeWidth(QChar(ch));
 }
 
 QHash<TextRenderer::Properties, TextRenderer*> TextRenderer::_instances;
 
-Glyph::Glyph(int textureID, const QPoint& location, const QRect& bounds, int width) :
-    _textureID(textureID), _location(location), _bounds(bounds), _width(width) {
+float TextRenderer::drawString(
+  float x, float y,
+  const QString & str,
+  const glm::vec4& color,
+  float fontSize,
+  float maxWidth) {
+
+  // This is a hand made scale intended to match the previous scale of text in the application
+  float scale = 0.25f; //  DTP_TO_METERS;
+  if (fontSize > 0.0) {
+    scale *= fontSize / _fontSize;
+  }
+  
+  //bool wrap = false; // (maxWidth == maxWidth);
+  //if (wrap) {
+  //  maxWidth /= scale;
+  //}
+
+  // Stores how far we've moved from the start of the string, in DTP units
+  static const float SPACE_ADVANCE = getGlyph(' ').d;
+  glm::vec2 advance;
+  MatrixStack::withGlMatrices([&] {
+    // Fetch the matrices out of GL
+    _program->bind();
+    _program->setUniformValue("Color", color.r, color.g, color.b, color.a);
+    _program->setUniformValue("Projection", fromGlm(MatrixStack::projection().top()));
+    _texture->bind();
+    _vao->bind();
+
+    MatrixStack & mv = MatrixStack::modelview();
+    MatrixStack & pr = MatrixStack::projection();
+    // scale the modelview into font units
+    mv.translate(glm::vec2(x, y)).translate(glm::vec2(0, scale * -_ascent)).scale(glm::vec3(scale, -scale, scale));
+
+    foreach(QString token, str.split(" ")) {
+      // float tokenWidth = measureWidth(token, fontSize);
+      // if (wrap && 0 != advance.x && (advance.x + tokenWidth) > maxWidth) {
+      //  advance.x = 0;
+      //  advance.y -= (_ascent + _descent);
+      // }
+
+      foreach(QChar c, token) {
+        if (QChar('\n') == c) {
+          advance.x = 0;
+          advance.y -= (_ascent + _descent);
+          return;
+        }
+
+        if (!_glyphs.contains(c)) {
+          c = QChar('?');
+        }
+
+        // get metrics for this character to speed up measurements
+        const Glyph & m = _glyphs[c];
+        //if (wrap && ((advance.x + m.d) > maxWidth)) {
+        //  advance.x = 0;
+        //  advance.y -= (_ascent + _descent);
+        //}
+
+        // We create an offset vec2 to hold the local offset of this character
+        // This includes compensating for the inverted Y axis of the font
+        // coordinates
+        glm::vec2 offset(advance);
+        offset.y -= m.size.y;
+        // Bind the new position
+        mv.withPush([&] {
+          mv.translate(offset);
+          _program->setUniformValue("ModelView", fromGlm(mv.top()));
+          glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, (void*)(m.indexOffset));
+        });
+        advance.x += m.d;//+ m.offset.x;// font->getAdvance(m, mFontSize);
+      }
+      advance.x += SPACE_ADVANCE;
+    }
+
+    _vao->release();
+    _program->release();
+  });
+
+  return advance.x * scale;
 }
+
+
+#if 0
+
+int TextRenderer::draw(int x, int y, const char* str, const glm::vec4& color) {
+  int compactColor = ((int(color.x * 255.0f) & 0xFF)) |
+    ((int(color.y * 255.0f) & 0xFF) << 8) |
+    ((int(color.z * 255.0f) & 0xFF) << 16) |
+    ((int(color.w * 255.0f) & 0xFF) << 24);
+
+  int maxHeight = 0;
+  for (const char* ch = str; *ch != 0; ch++) {
+    const Glyph& glyph = getGlyph(*ch);
+    if (glyph.textureID() == 0) {
+      x += glyph.width();
+      continue;
+    }
+
+    if (glyph.bounds().height() > maxHeight) {
+      maxHeight = glyph.bounds().height();
+    }
+    //glBindTexture(GL_TEXTURE_2D, glyph.textureID());
+
+    int left = x + glyph.bounds().x();
+    int right = x + glyph.bounds().x() + glyph.bounds().width();
+    int bottom = y + glyph.bounds().y();
+    int top = y + glyph.bounds().y() + glyph.bounds().height();
+
+    glm::vec2  leftBottom = glm::vec2(float(left), float(bottom));
+    glm::vec2  rightTop = glm::vec2(float(right), float(top));
+
+    float scale = QApplication::desktop()->windowHandle()->devicePixelRatio() / IMAGE_SIZE;
+    float ls = glyph.location().x() * scale;
+    float rs = (glyph.location().x() + glyph.bounds().width()) * scale;
+    float bt = glyph.location().y() * scale;
+    float tt = (glyph.location().y() + glyph.bounds().height()) * scale;
+
+    const int NUM_COORDS_SCALARS_PER_GLYPH = 16;
+    float vertexBuffer[NUM_COORDS_SCALARS_PER_GLYPH] = { leftBottom.x, leftBottom.y, ls, bt,
+      rightTop.x, leftBottom.y, rs, bt,
+      rightTop.x, rightTop.y, rs, tt,
+      leftBottom.x, rightTop.y, ls, tt, };
+
+    const int NUM_COLOR_SCALARS_PER_GLYPH = 4;
+    int colorBuffer[NUM_COLOR_SCALARS_PER_GLYPH] = { compactColor, compactColor, compactColor, compactColor };
+
+    gpu::Buffer::Size offset = sizeof(vertexBuffer) * _numGlyphsBatched;
+    gpu::Buffer::Size colorOffset = sizeof(colorBuffer) * _numGlyphsBatched;
+    if ((offset + sizeof(vertexBuffer)) > _glyphsBuffer->getSize()) {
+      _glyphsBuffer->append(sizeof(vertexBuffer), (gpu::Buffer::Byte*) vertexBuffer);
+      _glyphsColorBuffer->append(sizeof(colorBuffer), (gpu::Buffer::Byte*) colorBuffer);
+    } else {
+      _glyphsBuffer->setSubData(offset, sizeof(vertexBuffer), (gpu::Buffer::Byte*) vertexBuffer);
+      _glyphsColorBuffer->setSubData(colorOffset, sizeof(colorBuffer), (gpu::Buffer::Byte*) colorBuffer);
+    }
+    _numGlyphsBatched++;
+
+    x += glyph.width();
+  }
+
+  // TODO: remove these calls once we move to a full batched rendering of the text, for now, one draw call per draw() function call
+  drawBatch();
+  clearBatch();
+
+  return maxHeight;
+}
+//_glyphsStreamFormat->setAttribute(gpu::Stream::POSITION, 0, gpu::Element(gpu::VEC2, gpu::FLOAT, gpu::XYZ), 0);
+//const int NUM_POS_COORDS = 2;
+//const int VERTEX_TEXCOORD_OFFSET = NUM_POS_COORDS * sizeof(float);
+//_glyphsStreamFormat->setAttribute(gpu::Stream::TEXCOORD, 0, gpu::Element(gpu::VEC2, gpu::FLOAT, gpu::UV), VERTEX_TEXCOORD_OFFSET);
+
+//_glyphsStreamFormat->setAttribute(gpu::Stream::COLOR, 1, gpu::Element(gpu::VEC4, gpu::UINT8, gpu::RGBA));
+
+//_glyphsStream->addBuffer(_glyphsBuffer, 0, _glyphsStreamFormat->getChannels().at(0)._stride);
+//_glyphsStream->addBuffer(_glyphsColorBuffer, 0, _glyphsStreamFormat->getChannels().at(1)._stride);
+
+//_font.setKerning(false);
+#endif

libraries/render-utils/src/TextRenderer.h

@@ -14,7 +14,7 @@
 
 #include <gpu/GPUConfig.h>
 #include <glm/glm.hpp>
-
+#include <unordered_map>
 #include <QColor>
 #include <QFont>
 #include <QFontMetrics>
@@ -22,11 +22,15 @@
 #include <QImage>
 #include <QVector>
 
+// FIXME, decouple from the GL headers
+#include <QOpenGLShaderProgram>
+#include <QOpenGLTexture>
+#include <QOpenGLVertexArrayObject>
+#include <QOpenGLBuffer>
+
 #include <gpu/Resource.h>
 #include <gpu/Stream.h>
 
-
-
 // a special "character" that renders as a solid block
 const char SOLID_BLOCK_CHAR = 127;
 
@@ -45,19 +49,17 @@ const char SOLID_BLOCK_CHAR = 127;
 #define INCONSOLATA_FONT_WEIGHT QFont::Bold
 #endif
 
-class Glyph;
 
 class TextRenderer {
 public:
-
     enum EffectType { NO_EFFECT, SHADOW_EFFECT, OUTLINE_EFFECT };
 
     class Properties {
     public:
-        QFont font;
-        EffectType effect;
-        int effectThickness;
-        QColor color;
+      QString font;
+      EffectType effect;
+      int effectThickness;
+      QColor color;
     };
 
     static TextRenderer* getInstance(const char* family, int pointSize = -1, int weight = -1, bool italic = false,
@@ -65,30 +67,72 @@ public:
 
     ~TextRenderer();
 
-    const QFontMetrics& metrics() const { return _metrics; }
-
     // returns the height of the tallest character
-    int calculateHeight(const char* str);
+    int calculateHeight(const char * str) const;
+    int calculateHeight(const QString & str) const;
+
+    int computeWidth(char ch) const;
+    int computeWidth(const QChar & ch) const;
+
+    int computeWidth(const QString & str) const;
+    int computeWidth(const char * str) const;
 
     // also returns the height of the tallest character
-    int draw(int x, int y, const char* str, const glm::vec4& color);
-    
-    int computeWidth(char ch);
-    int computeWidth(const char* str);
-    
+    inline int draw(int x, int y, const char* str,
+      const glm::vec4& color = glm::vec4(-1),
+      float fontSize = -1,
+      float maxWidth = -1
+    ) {
+      return drawString(x, y, QString(str), color, fontSize, maxWidth);
+    }
+
+    float drawString(
+      float x, float y,
+      const QString & str,
+      const glm::vec4& color = glm::vec4(-1),
+      float fontSize = -1,
+      float maxWidth = -1);
+
     void drawBatch();
     void clearBatch();
 private:
 
+    static QHash<Properties, TextRenderer*> _instances;
+
+    // Allow fonts to scale appropriately when rendered in a 
+    // scene where units are meters
+    static const float DTP_TO_METERS; // = 0.003528f;
+    static const float METERS_TO_DTP; // = 1.0 / DTP_TO_METERS;
+    static const char SHADER_TEXT_FS[];
+    static const char SHADER_TEXT_VS[];
+  
     TextRenderer(const Properties& properties);
 
-    const Glyph& getGlyph(char c);
+    // stores the font metrics for a single character
+    struct Glyph {
+      QChar c;
+      glm::vec2 ul;
+      glm::vec2 lr;
+      glm::vec2 size;
+      glm::vec2 offset;
+      float d;  // xadvance - adjusts character positioning
+      size_t indexOffset;
 
-    // the font to render
-    QFont _font;
-    
-    // the font metrics
-    QFontMetrics _metrics;
+      int width() const {
+        return size.x;
+      }
+      QRectF bounds() const;
+      QRectF textureBounds(const glm::vec2 & textureSize) const;
+
+      void read(QIODevice & in);
+    };
+
+    using TexturePtr = QSharedPointer < QOpenGLTexture >;
+    using VertexArrayPtr = QSharedPointer< QOpenGLVertexArrayObject >;
+    using ProgramPtr = QSharedPointer < QOpenGLShaderProgram >;
+    using BufferPtr = QSharedPointer < QOpenGLBuffer >;
+
+    const Glyph& getGlyph(const QChar & c) const;
 
     // the type of effect to apply
     EffectType _effectType;
@@ -97,58 +141,40 @@ private:
     int _effectThickness;
     
     // maps characters to cached glyph info
-    QHash<char, Glyph> _glyphs;
+    QHash<QChar, Glyph> _glyphs;
     
     // the id of the glyph texture to which we're currently writing
     GLuint _currentTextureID;
     
-    // the position within the current glyph texture
-    int _x, _y;
+    int _pointSize;
     
     // the height of the current row of characters
     int _rowHeight;
     
-    // the list of all texture ids for which we're responsible
-    QVector<GLuint> _allTextureIDs;
-    
     // text color
     QColor _color;
-    
-    // Graphics Buffer containing the current accumulated glyphs to render
-    gpu::BufferPointer _glyphsBuffer;
-    gpu::BufferPointer _glyphsColorBuffer;
-    gpu::Stream::FormatPointer _glyphsStreamFormat;
-    gpu::BufferStreamPointer _glyphsStream;
-    int _numGlyphsBatched;
 
-    static QHash<Properties, TextRenderer*> _instances;
+    QString _family;
+    float _fontSize{ 12 };
+    float _leading{ 0 };
+    float _ascent{ 0 };
+    float _descent{ 0 };
+    float _spaceWidth{ 0 };
+
+    BufferPtr _vertices;
+    BufferPtr _indices;
+    TexturePtr _texture;
+    VertexArrayPtr _vao;
+    QImage _image;
+    ProgramPtr _program;
+
+    // Parse the signed distance field font file
+    void read(const QString & path);
+    void read(QIODevice & path);
+
+    // Initialize the OpenGL structures
+    void setupGL();
 };
 
-class Glyph {
-public:
-    
-    Glyph(int textureID = 0, const QPoint& location = QPoint(), const QRect& bounds = QRect(), int width = 0);
-    
-    GLuint textureID() const { return _textureID; }
-    const QPoint& location () const { return _location; }
-    const QRect& bounds() const { return _bounds; }
-    int width () const { return _width; }
-    
-    bool isValid() { return _width != 0; }
-    
-private:
-    
-    // the id of the OpenGL texture containing the glyph
-    GLuint _textureID;
-    
-    // the location of the character within the texture
-    QPoint _location;
-    
-    // the bounds of the character
-    QRect _bounds;
-    
-    // the width of the character (distance to next, as opposed to bounds width)
-    int _width;
-};
 
 #endif // hifi_TextRenderer_h