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Orbiting via 3D Transformations

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master
sigonasr2 1 year ago
parent 4d952f035d
commit 532483c6f9
1 changed files with 49 additions and 21 deletions
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  1. 70
      Models/main.cpp

70
Models/main.cpp
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@ -7,6 +7,7 @@
#include <glm/gtc/type_ptr.hpp> #include <glm/gtc/type_ptr.hpp>
#include <glm/gtc/matrix_transform.hpp> #include <glm/gtc/matrix_transform.hpp>
#include <array> #include <array>
#include <stack>
#define numVAOs 1 #define numVAOs 1
#define numVBOs 2 #define numVBOs 2
@ -16,11 +17,11 @@ GLuint vao[numVAOs];
GLuint vbo[numVBOs]; GLuint vbo[numVBOs];
glm::vec3 camera; glm::vec3 camera;
glm::vec3 cubeLoc,pyramidLoc;
GLuint mvLoc,projLoc; GLuint mvLoc,projLoc;
int width, height; int width, height;
float aspect; float aspect;
glm::mat4 mMat, pMat, vMat, mvMat; glm::mat4 mMat, pMat, vMat, mvMat;
std::stack<glm::mat4>transforms;
void setupVertices(void) { // 36 vertices, 12 triangles, makes 2x2x2 cube placed at origin void setupVertices(void) { // 36 vertices, 12 triangles, makes 2x2x2 cube placed at origin
float cubePositions[108] = { float cubePositions[108] = {
@ -58,14 +59,27 @@ void setupVertices(void) { // 36 vertices, 12 triangles, makes 2x2x2 cube placed
void init(GLFWwindow* window) { void init(GLFWwindow* window) {
renderingProgram=utils::createShaderProgram("vertShader.glsl","fragShader.glsl"); renderingProgram=utils::createShaderProgram("vertShader.glsl","fragShader.glsl");
camera={0.0f,0.0f,-8.0f}; camera={0.0f,0.0f,-12.0f};
cubeLoc={0.0f,-2.0f,0.0f};
pyramidLoc={4.0f,4.0f,-4.0f};
setupVertices(); setupVertices();
} }
double lastTime=0; double lastTime=0;
void DrawCube(){
glUniformMatrix4fv(mvLoc,1,GL_FALSE,glm::value_ptr(mMat));
glUniformMatrix4fv(projLoc,1,GL_FALSE,glm::value_ptr(pMat));
glBindBuffer(GL_ARRAY_BUFFER,vbo[0]);
glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,0,0);
glDrawArrays(GL_TRIANGLES,0,36);
}
void DrawSquarePyramid(){
glUniformMatrix4fv(mvLoc,1,GL_FALSE,glm::value_ptr(mMat));
glUniformMatrix4fv(projLoc,1,GL_FALSE,glm::value_ptr(pMat));
glBindBuffer(GL_ARRAY_BUFFER,vbo[1]);
glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,0,0);
glDrawArrays(GL_TRIANGLES,0,18);
}
void display(GLFWwindow* window, double currentTime) { void display(GLFWwindow* window, double currentTime) {
double elapsedTime=currentTime-lastTime; double elapsedTime=currentTime-lastTime;
lastTime=currentTime; lastTime=currentTime;
@ -77,6 +91,7 @@ void display(GLFWwindow* window, double currentTime) {
glUseProgram(renderingProgram); glUseProgram(renderingProgram);
glEnable(GL_DEPTH_TEST); glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL); glDepthFunc(GL_LEQUAL);
glEnableVertexAttribArray(0);
mvLoc=glGetUniformLocation(renderingProgram,"mv_matrix"); mvLoc=glGetUniformLocation(renderingProgram,"mv_matrix");
projLoc=glGetUniformLocation(renderingProgram,"proj_matrix"); projLoc=glGetUniformLocation(renderingProgram,"proj_matrix");
@ -86,24 +101,37 @@ void display(GLFWwindow* window, double currentTime) {
pMat=glm::perspective(utils::degToRad(60),aspect,0.1f,1000.f); pMat=glm::perspective(utils::degToRad(60),aspect,0.1f,1000.f);
vMat=glm::translate(glm::mat4(1.0f),glm::vec3{camera.x,camera.y,camera.z}); vMat=glm::translate(glm::mat4(1.0f),glm::vec3{camera.x,camera.y,camera.z});
mMat=glm::translate(glm::mat4(1.0f),cubeLoc); transforms.push(vMat);
mvMat=vMat*mMat;
glUniformMatrix4fv(mvLoc,1,GL_FALSE,glm::value_ptr(mvMat));
glUniformMatrix4fv(projLoc,1,GL_FALSE,glm::value_ptr(pMat));
glBindBuffer(GL_ARRAY_BUFFER,vbo[0]); mMat=glm::translate(transforms.top(),{0.f,0.f,0.f});
glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,0,0); transforms.push(mMat);
glEnableVertexAttribArray(0); mMat=glm::rotate(mMat,float(utils::degToRad(90)*currentTime),{0.f,1.f,0.f});
glDrawArrays(GL_TRIANGLES,0,36); mMat=glm::rotate(mMat,float(utils::degToRad(12)),{0.f,0.f,1.f});
DrawSquarePyramid();
mMat=glm::translate(glm::mat4(1.0f),pyramidLoc); mMat=glm::translate(transforms.top(),{0.f,0.f,0.f});
mvMat=vMat*mMat; mMat=glm::rotate(mMat,float(utils::degToRad(90)*currentTime),{0.f,1.f,0.f});
glUniformMatrix4fv(mvLoc,1,GL_FALSE,glm::value_ptr(mvMat)); mMat=glm::rotate(mMat,float(utils::degToRad(192)),{0.f,0.f,1.f});
glUniformMatrix4fv(projLoc,1,GL_FALSE,glm::value_ptr(pMat)); mMat=glm::translate(mMat,{0.f,2.f,0.f});
glBindBuffer(GL_ARRAY_BUFFER,vbo[1]); mMat=glm::rotate(mMat,float(utils::degToRad(270)),{0.f,1.f,0.f});
glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,0,0); DrawSquarePyramid();
glDrawArrays(GL_TRIANGLES,0,18);
mMat=glm::translate(transforms.top(),{sin(currentTime*0.5)*6,sin(currentTime*0.5)*0.8-1,cos(currentTime*0.5)*6});
transforms.push(mMat);
mMat=glm::rotate(mMat,float(utils::degToRad(24)-28),{0,0,1});
mMat=glm::rotate(mMat,float(utils::degToRad(24)*currentTime+28),{0,1,0});
DrawCube();
mMat=glm::rotate(transforms.top(),utils::degToRad(90),{1,0,0});
mMat=glm::translate(mMat,{sin(currentTime*3)*3,0,cos(currentTime*3)*3});
mMat=glm::scale(mMat,{0.3,0.3,0.3});
mMat=glm::rotate(mMat,float(-utils::degToRad(220)*currentTime+4),{0,1,0});
DrawCube();
mMat=glm::rotate(transforms.top(),utils::degToRad(90),{1,1,0});
mMat=glm::translate(mMat,{sin(currentTime*3)*3,0,cos(currentTime*3)*3});
mMat=glm::scale(mMat,{0.3,0.3,0.3});
mMat=glm::rotate(mMat,float(utils::degToRad(120)*currentTime),{0,1,0});
DrawCube();
} }
int main(void) { int main(void) {

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