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