137 lines
4.3 KiB
C++
137 lines
4.3 KiB
C++
#include <algorithm>
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#include "MyGlWindow.h"
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//Getting the projection matrix
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glm::mat4x4 perspective(float fovy, float aspect, float near, float far)
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{
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float fovy2 = glm::tan(fovy / 2);
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glm::mat4x4 pmat{ { 1 / (aspect * fovy2), 0, 0, 0},
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{ 0, 1 / fovy2, 0, 0},
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{ 0, 0, -((far + near) / (far - near)), -1},
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{ 0, 0, -((2 * far * near) / (far - near)), 0} };
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return pmat;
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}
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// Getting the view matrix
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glm::mat4x4 lookAt(glm::vec3 campos, glm::vec3 look, glm::vec3 up)
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{
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glm::vec3 ZCam(glm::normalize(campos - look));
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glm::vec3 XCam(glm::normalize(glm::cross(up, ZCam)));
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glm::vec3 YCam(glm::normalize(glm::cross(ZCam, XCam)));
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glm::mat4x4 cam_mat{ {XCam.x, YCam.x, ZCam.x, 0},
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{XCam.y, YCam.y, ZCam.y, 0},
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{XCam.z, YCam.z, ZCam.z, 0},
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{0, 0, 0 ,1} };
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glm::mat4x4 norm_mat{ {1, 0, 0, 0},
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{0, 1, 0, 0},
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{0, 0, 1, 0},
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{-campos.x, -campos.y, -campos.z, 1} };
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return cam_mat * norm_mat;
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}
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MyGlWindow::MyGlWindow(int w, int h) :
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viewer(glm::vec3(5, 5, 5), glm::vec3(0, 0, 0), glm::vec3(0, 1, 0), 45.0f, (w / (float)h))
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{
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m_width = w;
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m_height = h;
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setup();
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}
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MyGlWindow::~MyGlWindow()
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{
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}
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void MyGlWindow::setBgColor(float bgColor[3])
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{
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_bgColor[0] = bgColor[0];
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_bgColor[1] = bgColor[1];
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_bgColor[2] = bgColor[2];
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}
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void MyGlWindow::setup()
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{
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_staticShader = new ShaderProgram();
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_staticShader->initFromFiles("simple.vert", "simple.frag");
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_lightShader = new ShaderProgram();
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_lightShader->initFromFiles("light.vert", "simple.frag");
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_static_drawables.emplace_back(new CheckeredFloor(50, 16));
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_light_drawables.push_back(new ColorCube(false));
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_light_drawables.back()->addTranslation(glm::vec4(2, 1.1f, 0, 0));
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_light_drawables.push_back(new Sphere(1, 100, 100));
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_light_drawables.back()->addTranslation(glm::vec4(-2, 1.1f, 0, 0));
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_light_drawables.push_back(new VBOTeapot(64, glm::identity<glm::mat4x4>()));
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_light_drawables.back()->addTranslation(glm::vec4(2, 3, -7, 0));
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_light_drawables.back()->addRotation(glm::vec4(1, 0, 0, -90));
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}
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void MyGlWindow::draw()
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{
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glClearColor(_bgColor[0], _bgColor[1], _bgColor[2], 1);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glViewport(0, 0, m_width, m_height);
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glEnable(GL_DEPTH_TEST);
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glm::vec3 eye(viewer.getViewPoint().x, viewer.getViewPoint().y, viewer.getViewPoint().z);
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glm::vec3 look(viewer.getViewCenter().x, viewer.getViewCenter().y, viewer.getViewCenter().z);
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glm::vec3 up(viewer.getUpVector().x, viewer.getUpVector().y, viewer.getUpVector().z);
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glm::mat4 view = lookAt(eye, look, up); //Calculate view matrix from paramters of m_viewer
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glm::mat4 projection = perspective(45.0f, m_width / m_height, 0.1f, 500.0f);
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_staticShader->use();
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_staticShader->addUniform("mvp");
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for (ADrawable *drawable : _static_drawables)
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drawable->draw(_staticShader, projection, view);
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_staticShader->disable();
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_lightShader->use();
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_lightShader->addUniform("mvp");
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_lightShader->addUniform("LightLocation"); //Light Position to camera coordinates : vec4
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_lightShader->addUniform("Kd"); //Diffuse Object Color :vec3
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glUniform3fv(_lightShader->uniform("Kd"), 1, glm::value_ptr(glm::vec3(1, 1, 0)));
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_lightShader->addUniform("Ld"); //Diffuse Light Color : vec3
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glUniform3fv(_lightShader->uniform("Ld"), 1, glm::value_ptr(glm::vec3(1, 1, 1)));
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_lightShader->addUniform("Ka"); //Diffuse Object Color :vec3
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glUniform3fv(_lightShader->uniform("Ka"), 1, glm::value_ptr(glm::vec3(0.2, 0.2, 0)));
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_lightShader->addUniform("La"); //Diffuse Light Color : vec3
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glUniform3fv(_lightShader->uniform("La"), 1, glm::value_ptr(glm::vec3(1, 1, 1)));
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_lightShader->addUniform("Ks"); //Diffuse Object Color :vec3
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glUniform3fv(_lightShader->uniform("Ks"), 1, glm::value_ptr(glm::vec3(0.3, 0.3, 0)));
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_lightShader->addUniform("Ls"); //Diffuse Light Color : vec3
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glUniform3fv(_lightShader->uniform("Ls"), 1, glm::value_ptr(glm::vec3(1, 1, 1)));
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_lightShader->addUniform("NormalMatrix"); //Refer next slide : mat3
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_lightShader->addUniform("ModelViewMatrix"); //View*Model : mat4
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for (ADrawable *drawable : _light_drawables)
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drawable->draw(_lightShader, projection, view);
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_lightShader->disable();
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}
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void MyGlWindow::AddDrawable(ADrawable *d)
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{
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_static_drawables.push_back(d);
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}
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void MyGlWindow::resize(int w, int h)
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{
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m_width = w;
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m_height = h;
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viewer.setAspectRatio(w / float(h));
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}
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