Gui pisan u c

[mikikg]

Ovde su neki osnovni primeri sa OpenGL u C preko standardne GLUT biblioteke:
https://www.opengl.org/archives/resource...mples.html

Ovo je isto GLUT samo u C++ varijanti:
https://cs.lmu.edu/~ray/notes/openglexamples/

GLSL - tutorial o shejderima:
https://learnopengl.com/Getting-started/Shaders

Konkretno jedan minimalan primer sa Fontovima i transformacijom

Code:

/* Copyright (c) Mark J. Kilgard, 1994. */ /* This program is freely distributable without licensing fees    and is provided without guarantee or warrantee expressed or    implied. This program is -not- in the public domain. */ #include <string.h> #include <stdio.h> #include <stdarg.h> #include <GL/glut.h> void bitmap_output(int x, int y, char *string, void *font) {   int len, i;   glRasterPos2f(x, y);   len = (int) strlen(string);   for (i = 0; i < len; i++) {     glutBitmapCharacter(font, string[i]);   } } void stroke_output(GLfloat x, GLfloat y, char *format,...) {   va_list args;   char buffer[200], *p;   va_start(args, format);   vsprintf(buffer, format, args);   va_end(args);   glPushMatrix();   glTranslatef(x, y, 0);   glScalef(0.005, 0.005, 0.005);   for (p = buffer; *p; p++)     glutStrokeCharacter(GLUT_STROKE_ROMAN, *p);   glPopMatrix(); } void display(void) {   glClear(GL_COLOR_BUFFER_BIT);   bitmap_output(40, 35, "This is written in a GLUT bitmap font.",     GLUT_BITMAP_TIMES_ROMAN_24);   bitmap_output(30, 210, "More bitmap text is a fixed 9 by 15 font.",     GLUT_BITMAP_9_BY_15);   bitmap_output(70, 240, "                Helvetica is yet another bitmap font.",     GLUT_BITMAP_HELVETICA_18);   glMatrixMode(GL_PROJECTION);   glPushMatrix();   glLoadIdentity();   gluPerspective(40.0, 1.0, 0.1, 20.0);   glMatrixMode(GL_MODELVIEW);   glPushMatrix();   gluLookAt(0.0, 0.0, 4.0,  /* eye is at (0,0,30) */     0.0, 0.0, 0.0,      /* center is at (0,0,0) */     0.0, 1.0, 0.);      /* up is in postivie Y direction */   glPushMatrix();   glTranslatef(0, 0, -4);   glRotatef(50, 0, 1, 0);   stroke_output(-2.5, 1.1, "  This is written in a");   stroke_output(-2.5, 0, " GLUT stroke font.");   stroke_output(-2.5, -1.1, "using 3D perspective.");   glPopMatrix();   glMatrixMode(GL_MODELVIEW);   glPopMatrix();   glMatrixMode(GL_PROJECTION);   glPopMatrix();   glMatrixMode(GL_MODELVIEW);   glFlush(); } void reshape(int w, int h) {   glViewport(0, 0, w, h);   glMatrixMode(GL_PROJECTION);   glLoadIdentity();   gluOrtho2D(0, w, 0, h);   glScalef(1, -1, 1);   glTranslatef(0, -h, 0);   glMatrixMode(GL_MODELVIEW); } int main(int argc, char **argv) {   glutInit(&argc, argv);   glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);   glutInitWindowSize(465, 250);   glutCreateWindow("GLUT bitmap & stroke font example");   glClearColor(1.0, 1.0, 1.0, 1.0);   glColor3f(0, 0, 0);   glLineWidth(3.0);   glutDisplayFunc(display);   glutReshapeFunc(reshape);   glutMainLoop();   return 0;             /* ANSI C requires main to return int. */ }