////  RenderableTextEntityItem.cpp//  interface/src////  Created by Brad Hefta-Gaub on 8/6/14.//  Copyright 2014 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #include <glm/gtx/quaternion.hpp> #include "InterfaceConfig.h" #include <TextEntityItem.h>#include <PerfStat.h> #include "Menu.h"#include "EntityTreeRenderer.h"#include "RenderableTextEntityItem.h" const int FIXED_FONT_POINT_SIZE = 40;const float LINE_SCALE_RATIO = 1.2f; EntityItem* RenderableTextEntityItem::factory(const EntityItemID& entityID, const EntityItemProperties& properties) {    return new RenderableTextEntityItem(entityID, properties);} void RenderableTextEntityItem::render(RenderArgs* args) {    PerformanceTimer perfTimer("RenderableTextEntityItem::render");    assert(getType() == EntityTypes::Text);    glm::vec3 position = getPositionInMeters();    glm::vec3 dimensions = getDimensions() * (float)TREE_SCALE;    glm::vec3 halfDimensions = dimensions / 2.0f;    glm::quat rotation = getRotation();    float leftMargin = 0.1f;    float rightMargin = 0.1f;    float topMargin = 0.1f;    float bottomMargin = 0.1f;     //qDebug() << "RenderableTextEntityItem::render() id:" << getEntityItemID() << "text:" << getText();     glPushMatrix();     {        glTranslatef(position.x, position.y, position.z);        glm::vec3 axis = glm::axis(rotation);        glRotatef(glm::degrees(glm::angle(rotation)), axis.x, axis.y, axis.z);         const float MAX_COLOR = 255.0f;        xColor backgroundColor = getBackgroundColorX();        float alpha = 1.0f; //getBackgroundAlpha();        glColor4f(backgroundColor.red / MAX_COLOR, backgroundColor.green / MAX_COLOR, backgroundColor.blue / MAX_COLOR, alpha);               const float SLIGHTLY_BEHIND = -0.005f;         glBegin(GL_QUADS);            glVertex3f(-halfDimensions.x, -halfDimensions.y, SLIGHTLY_BEHIND);            glVertex3f(halfDimensions.x, -halfDimensions.y, SLIGHTLY_BEHIND);            glVertex3f(halfDimensions.x, halfDimensions.y, SLIGHTLY_BEHIND);            glVertex3f(-halfDimensions.x, halfDimensions.y, SLIGHTLY_BEHIND);        glEnd();                const int FIXED_FONT_SCALING_RATIO = FIXED_FONT_POINT_SIZE * 40.0f; // this is a ratio determined through experimentation                // Same font properties as textSize()        TextRenderer* textRenderer = TextRenderer::getInstance(SANS_FONT_FAMILY, FIXED_FONT_POINT_SIZE);        float maxHeight = (float)textRenderer->calculateHeight("Xy") * LINE_SCALE_RATIO;                float scaleFactor =  (maxHeight / FIXED_FONT_SCALING_RATIO) * _lineHeight;          glTranslatef(-(halfDimensions.x - leftMargin), halfDimensions.y - topMargin, 0.0f);         glm::vec2 clipMinimum(0.0f, 0.0f);        glm::vec2 clipDimensions((dimensions.x - (leftMargin + rightMargin)) / scaleFactor,                                  (dimensions.y - (topMargin + bottomMargin)) / scaleFactor);         glScalef(scaleFactor, -scaleFactor, 1.0);        enableClipPlane(GL_CLIP_PLANE0, -1.0f, 0.0f, 0.0f, clipMinimum.x + clipDimensions.x);        enableClipPlane(GL_CLIP_PLANE1, 1.0f, 0.0f, 0.0f, -clipMinimum.x);        enableClipPlane(GL_CLIP_PLANE2, 0.0f, -1.0f, 0.0f, clipMinimum.y + clipDimensions.y);        enableClipPlane(GL_CLIP_PLANE3, 0.0f, 1.0f, 0.0f, -clipMinimum.y);            xColor textColor = getTextColorX();        glColor3f(textColor.red / MAX_COLOR, textColor.green / MAX_COLOR, textColor.blue / MAX_COLOR);        QStringList lines = _text.split("\n");        int lineOffset = maxHeight;        float textAlpha = 1.0f; // getTextAlpha()        foreach(QString thisLine, lines) {            textRenderer->draw(0, lineOffset, qPrintable(thisLine), textAlpha);            lineOffset += maxHeight;        }         glDisable(GL_CLIP_PLANE0);        glDisable(GL_CLIP_PLANE1);        glDisable(GL_CLIP_PLANE2);        glDisable(GL_CLIP_PLANE3);            }     glPopMatrix();} void RenderableTextEntityItem::enableClipPlane(GLenum plane, float x, float y, float z, float w) {    GLdouble coefficients[] = { x, y, z, w };    glClipPlane(plane, coefficients);    glEnable(plane);}