opengl|09——qt opengl 方向光源 shader opengl|qt

qmyopenglwidget.h

#ifndef QMYOPENGLWIDGET_H #define QMYOPENGLWIDGET_H#include #include #include #include class QMyOpenglWidget : public QOpenGLWidget, QOpenGLFunctions_3_3_Core { public: enum EType { eNone, eFull, eLine, ePoint,}; Q_OBJECT public: explicit QMyOpenglWidget(QWidget* parent = nullptr); protected: virtual void initializeGL(); virtual void resizeGL(int w, int h); virtual void paintGL(); public: void cretaeShader(); void initDrawData(GLuint &vao, float *vertices, int vSize); void modeChange(EType type = eLine); unsigned int setImage(const char *filename); private: unsigned int vao1; unsigned int ebo1; QOpenGLShaderProgram program; GLuint programId; GLint mLocation; GLint vLocation; GLint pLocation; GLint lightDirLocation; GLint vertexLocation; GLint normalLocation; GLint colorLocation; GLint uvLocation; QMatrix4x4 mMatrix; QMatrix4x4 vMatrix; QMatrix4x4 pMatrix; float *lightDirVec3; unsigned int texture0; signals:public slots:}; #endif // QMYOPENGLWIDGET_H

qmyopenglwidget.cpp

#include "qmyopenglwidget.h" #include QMyOpenglWidget::QMyOpenglWidget(QWidget* parent):QOpenGLWidget(parent) {}void QMyOpenglWidget::initializeGL() { initializeOpenGLFunctions(); cretaeShader(); //三角形顶点坐标 float s = 2.0f/2; GLfloat vertices[] = {//上 -s,s,s, s,s,s, s,s, -s, -s,s, -s,//下 -s, -s, -s, s, -s, -s, s, -s,s, -s, -s,s,//前 -s, -s,s, s, -s,s, s,s,s, -s,s,s, //后 s, -s, -s, -s, -s, -s, -s,s, -s, s,s, -s, //left -s, -s, -s, -s, -s,s, -s,s,s, -s,s, -s, //right s, -s,s, s, -s, -s, s,s, -s, s,s,s, }; initDrawData(vao1, vertices, sizeof(vertices)); glEnable(GL_CULL_FACE); //启动了背面裁剪 glFrontFace(GL_CCW); //设置逆时针为正面 //glEnable(GL_DEPTH_TEST); glEnable(GL_DEPTH_TEST); glDepthFunc(GL_GEQUAL); }void QMyOpenglWidget::resizeGL(int w, int h) { glViewport(0, 0, w, h); pMatrix.setToIdentity(); float aspect = float(w*1.0)/ float(h); //printf("aspect = %f \n", aspect); qDebug()<<"aspect = "<0 && height > 0); //unsigned char *data = https://www.it610.com/article/stbi_load("container.jpg", &width, &height, &nrChannels, 0); if (image.bits()) { glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, image.bits()); glGenerateMipmap(GL_TEXTURE_2D); } else { //std::cout << "Failed to load texture" << std::endl; Q_ASSERT(0); }return texture; }void QMyOpenglWidget::modeChange(QMyOpenglWidget::EType type) { makeCurrent(); //设置当前opengl 渲染环境 switch(type) { case eLine: {glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); break; } case eFull: {glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); break; } case ePoint: {glPolygonMode(GL_FRONT_AND_BACK, GL_POINT); break; } default: {glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); break; } }//glBindVertexArray(vao1); //glDrawArrays(GL_TRIANGLES, 0, 3); update(); doneCurrent(); }

vertex.vert

#version 330 core uniform mat4 pMatrix; uniform mat4 vMatrix; uniform mat4 mMatrix; in vec3 pos; in vec3 normal; in vec2 uv0; out vec2 TexCoord0; out vec3 fnormal; void main(void) { //法线方向随着模型矩阵变动而变动 fnormal = vec3(mMatrix * vec4(normal, 1.0)); ; gl_Position = pMatrix* vMatrix * mMatrix * vec4(pos, 1.0); //fragPos = vec3(mMatrix * vec4(pos, 1.0)); TexCoord0 = uv0; }

frag.frag

#version 330 core in vec3 fnormal; out vec4 FragColor; //片段着色器输出 in vec2 TexCoord0; uniform sampler2D texture0; uniform vec3 lightDir; void main(void) { vec4 lightColor = vec4(3.0, 1.5, 0, 1); float fcolor = max(dot(normalize(fnormal), normalize(lightDir)), 0.0); FragColor = texture2D(texture0, TexCoord0) * fcolor * fcolor * fcolor * lightColor; }