QT-地形3D-编程知识

QT-地形3D

一、演示效果
二、关键程序
三、下载链接

一、演示效果

请添加图片描述

二、关键程序


#include "ShaderProgram.h"namespace t3d::core
{void ShaderProgram::init()
{initializeOpenGLFunctions();loadShaders();
}void ShaderProgram::addShader(const QString &filename, QOpenGLShader::ShaderType shaderType)
{QOpenGLShader *shader = new QOpenGLShader(shaderType, mProgram.get());if (!shader->compileSourceFile(gDefaultPathShaders + filename))qDebug() << "Error compiling shader " << filename << " of type "<< static_cast<int>(shaderType);if (!mProgram->addShader(shader))qDebug() << "Error adding shader " << filename << " of type "<< static_cast<int>(shaderType);
}void ShaderProgram::loadShaders()
{mProgram = makeUnique<QOpenGLShaderProgram>();addShaders();if (mProgram->link() == false)qFatal("Problem linking shaders");elseqDebug() << "Initialized shaders";mProgram->bind();queryUniformLocations();refreshUniformValues();flushQueuedUniformValueChanges();mProgram->release();
}bool ShaderProgram::bind()
{if (!mProgram->bind()){System::warn("Unable to bind OpenGL ShaderProgram");return false;}flushQueuedUniformValueChanges();return true;
}void ShaderProgram::reloadShaders()
{loadShaders();
}void ShaderProgram::enqueueUniformValueChange(const GLint *uniformLocation, QVariant value)
{if (mProgram && mProgram->isLinked()){mProgram->bind();setUniformFromQVariant(*uniformLocation, value);mProgram->release(); // TODO this can cause issues if used while the program was bound// externally}elsemQueuedUniformValueChanges.append(QPair<const GLint *, QVariant>(uniformLocation, value));
}void ShaderProgram::setUniformFromQVariant(GLint location, QVariant &value)
{switch (static_cast<QMetaType::Type>(value.type())){case QMetaType::Int:mProgram->setUniformValue(location, static_cast<GLint>(value.toInt()));break;case QMetaType::Double:mProgram->setUniformValue(location, static_cast<GLfloat>(value.toDouble()));break;case QMetaType::Float:mProgram->setUniformValue(location, static_cast<GLfloat>(value.toFloat()));break;default:qFatal("Trying to set a queued shader uniform value for an unknown type");// TODO this is all we support. Eventuall QOpenGLShaderProgram should support// setUniformValue directly from a QVariant.}
}void ShaderProgram::flushQueuedUniformValueChanges()
{for (auto pair : mQueuedUniformValueChanges){setUniformFromQVariant(*pair.first, pair.second);}mQueuedUniformValueChanges.clear();
}}