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Recreated most of basic gl functions and perspective

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This commit is contained in:
Muaz Ahmad 2023-05-02 15:44:33 +05:00
parent 89fb2f7ef3
commit d3adb5c325
2 changed files with 36 additions and 1 deletions
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34
opglwidget.cpp
View file

@ -1,13 +1,45 @@
#include "opglwidget.h" #include "opglwidget.h"
#include <GL/gl.h> #include <GL/gl.h>
#include <GL/glu.h>
#include <math.h> #include <math.h>
void OPGLWidget::initializeGL() { void OPGLWidget::initializeGL() {
glClearDepth(1.0f);
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
glShadeModel(GL_SMOOTH);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
GLfloat light_array[] = {0.4, 0.4, 0.4, 0.4};
GLfloat light_position[] = {10.0, 20.0, 10.0, 1.0};
glLightfv(GL_LIGHT0, GL_AMBIENT, light_array);
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_array);
glLightfv(GL_LIGHT0, GL_SPECULAR, light_array);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glClearColor(0.0f, 0.0f, 0.0f, 1.0f); glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
} }
void OPGLWidget::paintGL() { void OPGLWidget::paintGL() {
glClear(GL_COLOR_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
reorient();
}
void OPGLWidget::reorient() {
float F_mag = pow(loc[0], 2) + pow(loc[1], 2) +pow(loc[2], 2);
GLfloat f[] = {-loc[0]/F_mag, -loc[1] / F_mag, -loc[2] / F_mag};
GLfloat s[] = {-f[2], 0, f[0]};
float s_mag = pow(s[0], 2) + pow(s[1], 2) + pow(s[2], 2);
GLfloat u[] = {(s[1] * f[2] - s[2] * f[1]) / s_mag, (s[0] * f[2] - s[2] * f[0]) / s_mag, (s[0] * f[1] - s[1] * f[0]) / s_mag};
const GLfloat m[] = {s[0], u[0], -f[0], 0, s[1], u[1], -f[1], 0, s[2], u[2], -f[2], 0, 0, 0, 0, 1};
glMultMatrixf(m);
glTranslatef(-loc[0], -loc[1], -loc[2]);
} }
void OPGLWidget::resizeGL(int w, int h) { void OPGLWidget::resizeGL(int w, int h) {

3
opglwidget.h
View file

@ -8,4 +8,7 @@ protected:
void paintGL(); void paintGL();
void initializeGL(); void initializeGL();
void resizeGL(int w, int h); void resizeGL(int w, int h);
void reorient();
float loc[3] = {-10, 0, -10};
}; };