OpenGL绘制一个圆锥

绘制圆锥暂时没有找到一个模型完整绘制，暂时使用两个物体拼接：圆和锥面。

缺点：这需要绘制两次才能将圆锥体绘制成功。

#include "cone.h"
#include <QTimer>
#include <QDateTime>
#include <QImage>
#include <glm-master/glm/gtc/matrix_transform.hpp>
#include <glm-master/glm/gtc/type_ptr.hpp>
#include <QtMath>#define POINT_COUNT (362)static float circleVertices[POINT_COUNT*3];static float coneVertices[POINT_COUNT*3];Cone::Cone(QWidget* parent)
{QTimer * timer = new QTimer(this);connect(timer, SIGNAL(timeout()), this, SLOT(update()));timer->start(17);mProjectionMatrix = glm::mat4(1.0f);mViewMatrix = glm::mat4(1.0f);mModelMatrix = glm::mat4(1.0f);//centercircleVertices[0] = 0;circleVertices[1] = 0;circleVertices[2] = 0;coneVertices[0] = 0;coneVertices[1] = 0;coneVertices[2] = 1.0;float r = 0.5f;for(int i = 1; i <= POINT_COUNT - 1; i++) {int index = i*3;circleVertices[index] = r * sin(i * M_PI/ 180.0f);circleVertices[index+1] = r * cos(i * M_PI/ 180.0f);circleVertices[index+2] = 0;coneVertices[index] = r * sin(i * M_PI/ 180.0f);coneVertices[index+1] = r * cos(i * M_PI/ 180.0f);coneVertices[index+2] = 0;}
}void Cone::initializeGL()
{bool enabled = initializeOpenGLFunctions();qDebug() << "initializeGL" << enabled;glGenVertexArrays(1, &mCircleVAO);glGenBuffers(1, &mCircleVBO);glBindVertexArray(mCircleVAO);glBindBuffer(GL_ARRAY_BUFFER, mCircleVBO);glBufferData(GL_ARRAY_BUFFER, sizeof(circleVertices), circleVertices, GL_STATIC_DRAW);glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);glEnableVertexAttribArray(0);glBindBuffer(GL_ARRAY_BUFFER, 0);glGenVertexArrays(1, &mConeVAO);glGenBuffers(1, &mConeVBO);glBindVertexArray(mConeVAO);glBindBuffer(GL_ARRAY_BUFFER, mConeVBO);glBufferData(GL_ARRAY_BUFFER, sizeof(coneVertices), coneVertices, GL_STATIC_DRAW);glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);glEnableVertexAttribArray(0);glBindBuffer(GL_ARRAY_BUFFER, 0);mConeProgram.addShaderFromSourceFile(QOpenGLShader::Vertex, ":/shaders/cone.vsh");mConeProgram.addShaderFromSourceFile(QOpenGLShader::Fragment, ":/shaders/cone.fsh");bool success = mConeProgram.link();if(!success){qDebug() << "ERR: " << mConeProgram.log();}mCircleProgram.addShaderFromSourceFile(QOpenGLShader::Vertex, ":/shaders/circle.vsh");mCircleProgram.addShaderFromSourceFile(QOpenGLShader::Fragment, ":/shaders/circle.fsh");success = mCircleProgram.link();if(!success){qDebug() << "ERR: " << mCircleProgram.log();}mConeProjectionLoc = mConeProgram.uniformLocation("projection");mConeViewLoc = mConeProgram.uniformLocation("view");mConeModelLoc = mConeProgram.uniformLocation("model");mCircleProjectionLoc = mCircleProgram.uniformLocation("projection");mCircleViewLoc = mCircleProgram.uniformLocation("view");mCircleModelLoc = mCircleProgram.uniformLocation("model");
}void Cone::resizeGL(int w, int h)
{mViewMatrix  = glm::translate(mViewMatrix, glm::vec3(0.0f, 0.0f, -3.0f));mProjectionMatrix = glm::perspective(glm::radians(45.0f), (float)w / (float)h, 0.1f, 100.0f);glEnable(GL_DEPTH_TEST);
}void Cone::paintGL()
{mModelMatrix = glm::rotate(mModelMatrix, 0.01f, glm::vec3(1.0f, 0.0f, 0.0f));glClearColor(0.0f, 0.0f, 0.0f, 1.0f);glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);mCircleProgram.bind();glBindVertexArray(mCircleVAO);glUniformMatrix4fv(mCircleProjectionLoc, 1, GL_FALSE, glm::value_ptr(mProjectionMatrix));glUniformMatrix4fv(mCircleViewLoc, 1, GL_FALSE, glm::value_ptr(mViewMatrix));glUniformMatrix4fv(mCircleModelLoc, 1, GL_FALSE, glm::value_ptr(mModelMatrix));glDrawArrays(GL_TRIANGLE_FAN, 0, POINT_COUNT);mConeProgram.bind();glBindVertexArray(mConeVAO);glUniformMatrix4fv(mConeProjectionLoc, 1, GL_FALSE, glm::value_ptr(mProjectionMatrix));glUniformMatrix4fv(mConeViewLoc, 1, GL_FALSE, glm::value_ptr(mViewMatrix));glUniformMatrix4fv(mConeModelLoc, 1, GL_FALSE, glm::value_ptr(mModelMatrix));glDrawArrays(GL_TRIANGLE_FAN, 0, POINT_COUNT);
}

为了方便理解，VAO, VBO, Program 分别各准备一套。

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