QT使用openglES模块做的立方体程序

#include "testcurb.h" #include <QPainter> testCurb::testCurb(QWidget *parent):QOpenGLWidget(parent) { } void testCurb::initializeGL() { initializeOpenGLFunctions(); const char *vertexShaderSrc = // "#version 300 es\n" "attribute vec4 a_position; \n" "uniform mat4 u_mvp; \n" "varying vec4 v_color; \n" "void main() \n" "{ \n" " v_color = a_position*0.7 + 0.5; \n" " gl_Position = u_mvp * a_position; \n" "} \n"; const char *fragmentShaderSrc = // "#version 300 es\n" "varying vec4 v_color; \n" "void main() \n" "{ \n" " gl_FragColor = v_color; \n" "} \n"; GLuint vertexShader = LoadShader(GL_VERTEX_SHADER,vertexShaderSrc); GLuint fragmentShader = LoadShader(GL_FRAGMENT_SHADER,fragmentShaderSrc); m_program = glCreateProgram(); glAttachShader(m_program, vertexShader); glAttachShader(m_program, fragmentShader); glLinkProgram(m_program); //检查链接状态 GLint linked; glGetProgramiv(m_program,GL_LINK_STATUS,&linked); if(!linked) return ; // set the background clear color. glClearColor(0.0f, 0.0f, 0.0f, 1.0f); } void testCurb::exposeEvent(QExposeEvent *event) { } GLuint testCurb::LoadShader(GLenum type,const char *shaderSrc) { GLuint shader; GLint compiled; shader = glCreateShader(type); if(shader == 0) return 0; //加载shader glShaderSource(shader,1,&shaderSrc,nullptr); //编译着色器 glCompileShader(shader); //检查编译状态 glGetShaderiv(shader,GL_COMPILE_STATUS,&compiled); if(compiled==0) { return 0; } return shader; } void testCurb::resizeGL(int w, int h) { // Calculate aspect ratio qreal aspect = qreal(w) / qreal(h ? h : 1); // Set near plane to 3.0, far plane to 7.0, field of view 45 degrees const qreal zNear = 3.0, zFar = 7.0, fov = 45.0; // Reset projection projection.setToIdentity(); // Set perspective projection projection.perspective(fov, aspect, zNear, zFar); } void testCurb::paintGL() { qDebug() << 1; static GLfloat vCubeVertices[] = { -0.5f, 0.5f, 0.5f, // v0 -0.5f, -0.5f, 0.5f, // v1 0.5f, -0.5f, 0.5f, // v2 0.5f, 0.5f, 0.5f, // v3 0.5f, -0.5f, -0.5f, // v4 0.5f, 0.5f, -0.5f, // v5 -0.5f, 0.5f, -0.5f, // v6 -0.5f, -0.5f, -0.5f, // v7 }; static GLushort vCubeIndices[] = { 0, 1, 2, 0, 2, 3, // front face 5, 6, 7, 4, 5, 7, // back face 0, 1, 7, 0, 6, 7, // left face 2, 3, 4, 3, 4, 5, // right face 0, 3, 5, 0, 5, 6, // top face 1, 2, 4, 1, 4, 7 // bottom face }; glViewport(0, 0, width(), height()); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glUseProgram(m_program); GLuint vbos[2]; glGenBuffers(2, vbos); glBindBuffer(GL_ARRAY_BUFFER, vbos[0]); glBufferData(GL_ARRAY_BUFFER, sizeof(vCubeVertices), vCubeVertices, GL_STATIC_DRAW); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vbos[1]); glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(vCubeIndices), vCubeIndices, GL_STATIC_DRAW); glBindBuffer(GL_ARRAY_BUFFER, vbos[0]); glEnableVertexAttribArray(0); glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, nullptr); glBindAttribLocation(m_program, 0, "a_position"); static GLfloat angle = 0.0; GLint mvpLoc = glGetUniformLocation(m_program, "u_mvp"); QMatrix4x4 model, view, projection, mvp; model.rotate(angle + 5, QVector3D(1,0,0)); model.rotate(angle - 5, QVector3D(0,1,0)); model.scale(0.5, 0.5, 0.5); view.translate(0.5, 0.5, 0); angle += 10; mvp = projection * view * model; glUniformMatrix4fv(mvpLoc, 1, GL_FALSE, mvp.constData()); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vbos[1]); glDrawElements(GL_TRIANGLES, sizeof(vCubeIndices)/sizeof(GLushort), GL_UNSIGNED_SHORT, 0); /* draw another cube in different place with the same shader */ view.translate(-1.0, 0, 0); mvp = projection * view * model; glUniformMatrix4fv(mvpLoc, 1, GL_FALSE, mvp.constData()); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vbos[1]); glDrawElements(GL_TRIANGLES, sizeof(vCubeIndices)/sizeof(GLushort), GL_UNSIGNED_SHORT, 0); view.translate(0.0, -1.0, 0); mvp = projection * view * model; glUniformMatrix4fv(mvpLoc, 1, GL_FALSE, mvp.constData()); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vbos[1]); glDrawElements(GL_TRIANGLES, sizeof(vCubeIndices)/sizeof(GLushort), GL_UNSIGNED_SHORT, 0); view.translate(1.0, 0, 0); mvp = projection * view * model; glUniformMatrix4fv(mvpLoc, 1, GL_FALSE, mvp.constData()); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vbos[1]); glDrawElements(GL_TRIANGLES, sizeof(vCubeIndices)/sizeof(GLushort), GL_UNSIGNED_SHORT, 0); }