qtk/src/skybox.cpp

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/*##############################################################################
## Author: Shaun Reed ##
2022-03-06 16:54:05 +00:00
## Legal: All Content (c) 2022 Shaun Reed, all rights reserved ##
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## About: Skybox class using QtOpenGL ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com | GitHub: shaunrd0 ##
##############################################################################*/
#include <abstractscene.h>
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#include <skybox.h>
#include <texture.h>
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using namespace Qtk;
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Skybox::Skybox(std::string right, std::string top, std::string front,
std::string left, std::string bottom, std::string back,
const std::string & name)
: mCubeMap(Texture::initCubeMap(
QImage(right.c_str()).mirrored(), QImage(top.c_str()),
QImage(front.c_str()), QImage(left.c_str()),
QImage(bottom.c_str()), QImage(back.c_str()))),
mVBO(QOpenGLBuffer::VertexBuffer),
mVertices(Cube(QTK_DRAW_ELEMENTS).vertices()),
mIndices(Cube(QTK_DRAW_ELEMENTS).indices())
{ init();}
Skybox::Skybox(std::string name)
: Skybox(":/right.png", ":/top.png", ":/front.png",
":/left.png", ":/bottom.png", ":/back.png",
name)
{}
Skybox::Skybox(QOpenGLTexture * cubeMap, const std::string & name)
: mCubeMap(cubeMap) { init();}
/*******************************************************************************
* Public Member Functions
******************************************************************************/
void Skybox::draw()
{
glDepthFunc(GL_LEQUAL);
glDepthMask(GL_FALSE);
mVAO.bind();
mProgram.bind();
mCubeMap->bind();
mProgram.setUniformValue("uProjectionMatrix", Scene::Projection());
mProgram.setUniformValue("uViewMatrix", Scene::Camera().toMatrix());
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mProgram.setUniformValue("uTexture", 0);
glDrawElements(GL_TRIANGLES, mIndices.size(),
GL_UNSIGNED_INT, mIndices.data());
mCubeMap->release();
mProgram.release();
mVAO.release();
glDepthFunc(GL_LESS);
glDepthMask(GL_TRUE);
glActiveTexture(GL_TEXTURE0);
}
/*******************************************************************************
* Private Member Functions
******************************************************************************/
void Skybox::init()
{
initializeOpenGLFunctions();
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// Set up shader program
mProgram.create();
mProgram.addShaderFromSourceFile(QOpenGLShader::Vertex, ":/skybox.vert");
mProgram.addShaderFromSourceFile(QOpenGLShader::Fragment, ":/skybox.frag");
mProgram.link();
mProgram.bind();
// Setup VAO
mVAO.create();
mVAO.bind();
// Setup VBO for vertex position data
mVBO.create();
mVBO.setUsagePattern(QOpenGLBuffer::StaticDraw);
mVBO.bind();
// Allocate vertex positions into VBO
mVBO.allocate(mVertices.data(),
mVertices.size() * sizeof(mVertices[0]));
// Enable attribute array for vertex positions
mProgram.enableAttributeArray(0);
mProgram.setAttributeBuffer(0, GL_FLOAT, 0,
3, sizeof(QVector3D));
// Set shader texture unit to 0
mProgram.setUniformValue("uTexture", 0);
mVAO.release();
mVBO.release();
mProgram.release();
}