QT_环境学习opengl_QT_Opengl.zip

#include "openglmathmode.h" #include "ui_openglmathmode.h" #include <gl/GLU.h> #include<sstream> #include <cmath> //gl_Position = matrixModelViewProjection * vec4(vertexPosition, 1.0);\n\ // gl_Position = vec4(aPos, 1.0);\n\ // //顶点着色器 QString vertexShaderSource = R"(#version 330 core layout (location = 0) in vec3 aPos; // varyings (output) 输出给片段着色器 varying vec3 esVertex, esNormal; varying vec2 uv; varying vec4 color; varying vec4 v_position; attribute vec3 vertexPosition; attribute vec3 vertexNormal; attribute vec2 uvVertex; attribute vec4 vertexColor; uniform mat4 matrixNormal; uniform mat4 matrixModelView; uniform mat4 matrixModelViewProjection; void main() { esVertex = vec3(matrixModelView * vec4(aPos, 1.0)); esNormal = vec3(matrixNormal * vec4(vertexNormal, 1.0)); //color = vertexColor; color = vec4(0.0f, 1.0f, 0.0f, 1.0f); v_position = -matrixModelView * vec4(aPos, 1.0); gl_Position = matrixModelViewProjection * vec4(aPos, 1.0); uv = uvVertex; })"; //vec4(r, g, b, a), 前三个参数表示片元像素颜色值RGB，第四个参数是片元像素透明度A，1.0表示不透明, 0.0表示完全透明。 //片段着色器只需要一个输出变量，这个变量是一个4分量向量，它表示的是最终的输出颜色， // 我们应该自己将其计算出来。我们可以用out关键字声明输出变量，这里我们命名为FragColor。 // 下面，我们将一个alpha值为1.0(1.0代表完全不透明)的橘黄色的vec4赋值给颜色输出。 // gl_FragColor = vec4(1.0f, 1.0f, 0.0f, 1.0f);\n\ (也可使用内置变量修改颜色) //片段着色器 QString fragmentShaderSource = R"(#version 330 core out vec4 FragColor; #ifdef GL_ES precision mediump float; precision mediump int; #endif // uniforms uniform vec4 backColor; uniform vec4 lightPosition; uniform vec4 lightAmbient; uniform vec4 lightDiffuse; uniform vec4 lightSpecular; uniform int hsvactive; uniform int thereisRGBA; uniform float shininess; uniform int glFrontFacing_1; // varyings varying vec3 esVertex, esNormal; varying vec2 uv; varying vec4 color; varying vec4 v_position; // All components are in the range [0…1], including hue. uniform sampler2D imgTexture; vec3 hsv2rgb(vec3 c) { vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0); vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www); return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y); } void main() { vec4 color1=color; vec3 normal = normalize(esNormal); vec3 light; if (lightPosition.w == 0.0) { light = normalize(-lightPosition.xyz); } else { light = normalize(lightPosition.xyz - esVertex); } if (hsvactive == 1) color1 = vec4(hsv2rgb(color1.xyz), color1.w); vec3 view = normalize(-esVertex); vec3 halfv = normalize(light + view); vec4 fragColor = lightAmbient * color1; float dotNL = max(dot(normal, light), 0.0f); fragColor += lightDiffuse * dotNL * color1; // add diffuse float dotNH = max(dot(normal, halfv), 0.0); vec3 LightReflect = normalize(reflect(halfv, normal)); float SpecularFactor = dot(vec3(0.0f, 0.0f, 1.0f), -LightReflect); if (SpecularFactor > 0) { SpecularFactor = pow(SpecularFactor, shininess); fragColor += lightSpecular * 1.0f * SpecularFactor; } if (glFrontFacing_1 == 1){ FragColor = vec4(1.0, 0.0f, 0.0f, 1.0f); } else if (glFrontFacing_1 == 2) { FragColor = vec4(0.6f, 0.6f, 0.6f, 1.0f); } else if (glFrontFacing_1 == 3) { FragColor = vec4(1.0f, 0.0f, 0.0f, 1.0f); } else if (glFrontFacing_1 == 4) { FragColor = vec4(0.0f, 1.0f, 0.0f, 1.0f); } else if (glFrontFacing_1 == 5) { FragColor = vec4(0.0f, 0.0f, 1.0f, 1.0f); } else if (glFrontFacing_1 == 6) { FragColor = texture(imgTexture, uv); } else { float back = dot(vec3(0.0f, 0.0f, 1.0f), normal); if (back < 0.0f) { FragColor = vec4(1.0f, 1.0f, 0.0f, 1.0f); } else { if (glFrontFacing_1 == 6) { FragColor = texture(imgTexture, uv); } else { FragColor = fragColor; } } } })"; OpenglMathMode::OpenglMathMode(QWidget* parent) : QGLWidget(parent) , viewPortWidth(1600.0) , viewPortHeight(1000.0) { m_texture = nullptr; } OpenglMathMode::~OpenglMathMode() { } /* QOpenGLFunctions::initializeOpenGLFunctions()： 为当前上下文初始化OpenGL函数解析。调用此函数后，QOpenGLFunctions对象只能与当前上下文以及与其共享的其他上下文一起使用。再次调用initializeOpenGLFunctions()以更改对象的上下文关联。 QOpenGLContext::makeCurrent()： 在给定的surface上使当前线程中的上下文成为当前上下文。成功返回true, 否则返回false。如果表面未暴露，或者由于例如应用程序被挂起而导致图形硬件不可用，则后者可能发生。 QOpenGLContext::swapBuffers()： 交换渲染表面的前后缓冲区。调用此命令以完成OpenGL渲染的框架，并确保在发出任何其他OpenGL命令（例如，作为新框架的一部分）之前再次调用makeCurrent()。 */ void OpenglMathMode::initializeGL() { //设置裁剪面 glViewport(0, 0, viewPortWidth, viewPortHeight); //开启深度测试 glEnable(GL_DEPTH_TEST); m_texture = new QOpenGLTexture(QImage("D:/5.png")); //5.jpg //计算投影矩阵 proj(); //为当前上下文初始化OpenGL函数解析 initializeGLFunctions(); //初始化着色器 InitShader(); //初始化缓冲区 InitBuffer(); } void OpenglMathMode::resizeGL(int w, int h) { if (w > 300) { viewPortWidth = w; viewPortHeight = h; } //计算投影矩阵 proj(); } /* //视图矩阵 QMatrix4x4 view; view.setToIdentity();//对矩阵进行单位化，保证所有矩阵运算都会在一个单位矩阵上进行 view.lookAt(QVector3D(2, 2, 2), //眼睛的位置 QVector3D(0, 0, 0), //眼睛看的位置 QVector3D(0, 1, 0)); //此参数表示方向，相对于眼睛向上的方向。 //模型矩阵 QMatrix4x4 model; model.setToIdentity(); model.rotate(QTime::currentTime().msec(), 1.0f, 5.0f, 0.5f);//旋转 该矩阵将坐标绕矢量 (x, y, z) 旋转angle度 model.scale(0.6f);//缩放 */ void OpenglMathMode::paintGL() { resize(viewPortWidth, viewPortHeight); glViewport(0, 0, viewPortWidth, viewPortHeight); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); int i = 1000; glLoadName(i++); glPushMatrix(); // set modelview matrix matrixViewx.setToIdentity(); matrixViewx.translate(camera_pos); matrixViewx.rotate(rotation); matrixViewx.translate(translate.x(), translate.y(), translate.z()); matrixModelViewProjectionx = matrixProjectionx * matrixViewx; matrixNormalx = matrixViewx; matrixNormalx.setColumn(3, QVector4D(0, 0, 0, 1)); indexBuffer->bind(); uvBuffer->bind(); m_texture->bind(); shader.bind(); glUniformMatrix4fv(uniformMatrixModelView, 1, false, matrixViewx.data()); glUniformMatrix4fv(uniformMatrixModelViewProjection, 1, false, matrixModelViewProjectionx.data()); glUniformMatrix4fv(uniformMatrixNormal, 1, false, matrixNormalx.data()); shader.enableAttributeArray("uvVertex"); shader.enableAttributeArray("vertexNormal"); shader.enableAttributeArray("aPos"); shader.setUniformValue("glFrontFacing_1", 0); // 抗锯齿 //glEnable(GL_LINE_SMOOTH); //glHint(GL_LINE_SMOOTH, GL_NICEST); // 多边形偏移 glEnable(GL_POLYGON_OFFSET_FILL); glPolygonOffset(1.0f, 1.0f); // 模型主体绘制 glDrawElements(GL_TRIANGLES, indices.size(), GL_UNSIGNED_INT, 0); glDisable(GL_POLYGON_OFFSET_FILL); glPopMatrix(); shader.setUniformValue("glFrontFacing_1", 1); // 设置网格线的宽度 glLineWidth(0.4f); // 模型网格绘制 glDrawElements(GL_LINE_LOOP, indices.size(), GL_UNSIGNED_INT, 0); //世界网格绘制 shader.setUniformValue("glFrontFacing_1", 2); glLineWidth(0.3); glDrawArrays(GL_LINES, PlanStartIndex, 80); //X轴绘制 shader.setUniformValue("glFrontFacing_1", 3); glLineWidth(3.0); glDrawArrays(GL_LINES, PlanStartIndex + 80, 2); //Y轴绘制 shader.setUniformValue("glFrontFacing_1", 4); glDrawArrays(GL_LINES, PlanStartIndex + 82, 2); //Z轴绘制 shader.setUniformValue("glFrontFacing_1", 5); glDrawArrays(GL_LINES, PlanStartIndex + 84, 2); glLoadName(i++); glPushMatrix(); // set modelview matrix matrixViewx.setToIdentity(); matrixViewx.translate(QVector3D(-14.0, 0.0, -14.0));