mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-10-31 09:32:00 +01:00
135 lines
3.3 KiB
ObjectPascal
135 lines
3.3 KiB
ObjectPascal
{
|
|
GL units for Free Pascal - GLUT demo
|
|
1999 Sebastian Guenther, sguenther@gmx.de
|
|
|
|
You may use this source as starting point for your own programs; consider it
|
|
as Public Domain.
|
|
}
|
|
|
|
{$mode objfpc}
|
|
|
|
program GLUTDemo;
|
|
uses
|
|
GL, GLU, GLUT;
|
|
|
|
const
|
|
|
|
FPCImg: array[0..4, 0..10] of Byte =
|
|
((1, 1, 1, 0, 1, 1, 1, 0, 0, 1, 1),
|
|
(1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0),
|
|
(1, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0),
|
|
(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0),
|
|
(1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1));
|
|
|
|
var
|
|
counter: Integer;
|
|
|
|
|
|
const
|
|
colors: array[0..7, 0..2] of Single =
|
|
((0, 0, 0), (0, 0, 1), (0, 1, 0), (0, 1, 1),
|
|
(1, 0, 0), (1, 0, 1), (1, 1, 0), (1, 1, 1));
|
|
corners: array[0..7, 0..2] of Single =
|
|
((-1, -1, -1), (+1, -1, -1), (+1, +1, -1), (-1, +1, -1),
|
|
(-1, -1, +1), (+1, -1, +1), (+1, +1, +1), (-1, +1, +1));
|
|
|
|
|
|
procedure DrawCube;
|
|
procedure DrawSide(i1, i2, i3, i4: Integer);
|
|
begin
|
|
glColor4f (colors [i1, 0], colors [i1, 1], colors [i1, 2], 0.5);
|
|
glVertex3f(corners[i1, 0], corners[i1, 1], corners[i1, 2]);
|
|
glColor4f (colors [i2, 0], colors [i2, 1], colors [i2, 2], 0.5);
|
|
glVertex3f(corners[i2, 0], corners[i2, 1], corners[i2, 2]);
|
|
glColor4f (colors [i3, 0], colors [i3, 1], colors [i3, 2], 0.5);
|
|
glVertex3f(corners[i3, 0], corners[i3, 1], corners[i3, 2]);
|
|
|
|
glVertex3f(corners[i4, 0], corners[i4, 1], corners[i4, 2]);
|
|
end;
|
|
begin
|
|
glBegin(GL_QUADS);
|
|
DrawSide(4, 5, 6, 7); // Front
|
|
DrawSide(3, 2, 1, 0); // Back
|
|
DrawSide(2, 3, 7, 6); // Top
|
|
DrawSide(0, 1, 5, 4); // Bottom
|
|
DrawSide(4, 7, 3, 0); // Left
|
|
DrawSide(1, 2, 6, 5); // Right
|
|
glEnd;
|
|
end;
|
|
|
|
|
|
procedure DisplayWindow; cdecl;
|
|
var
|
|
x, y: Integer;
|
|
begin
|
|
Inc(counter);
|
|
|
|
glClearColor(0, 0, 0.2, 1);
|
|
glClear(GL_COLOR_BUFFER_BIT+GL_DEPTH_BUFFER_BIT);
|
|
|
|
glPushMatrix;
|
|
glTranslatef(0, 0, Sin(Single(counter) / 20.0) * 5.0 - 5.0);
|
|
glRotatef(Sin(Single(counter) / 200.0) * 720.0, 0, 1, 0);
|
|
glRotatef(counter, 0, 0, 1);
|
|
|
|
for y := 0 to 4 do
|
|
for x := 0 to 10 do
|
|
if FPCImg[y, x] > 0 then begin
|
|
glPushMatrix;
|
|
glRotatef(x * Sin(Single(counter) / 5.0), 0, 1, 0);
|
|
glRotatef(y * Sin(Single(counter) / 12.0) * 4.0, 0, 0, 1);
|
|
glTranslatef((x - 5) * 1, (2 - y) * 1, 0);
|
|
glScalef(0.4, 0.4, 0.4);
|
|
glRotatef(counter, 0.5, 1, 0);
|
|
DrawCube;
|
|
glPopMatrix;
|
|
end;
|
|
|
|
glPopMatrix;
|
|
|
|
Inc(counter);
|
|
|
|
glutSwapBuffers;
|
|
end;
|
|
|
|
procedure OnTimer(value: Integer); cdecl;
|
|
begin
|
|
glutPostRedisplay;
|
|
glutTimerFunc(20, @OnTimer, 0);
|
|
end;
|
|
|
|
begin
|
|
glutInit(@argc, argv);
|
|
|
|
glutInitDisplayMode(GLUT_RGB or GLUT_DOUBLE or GLUT_DEPTH);
|
|
glutCreateWindow('Free Pascal GLUT demo');
|
|
glutDisplayFunc(@DisplayWindow);
|
|
glutTimerFunc(20, @OnTimer, 0);
|
|
|
|
WriteLn;
|
|
WriteLn('GL info:');
|
|
WriteLn(' Vendor: ', PChar(glGetString(GL_VENDOR)));
|
|
WriteLn(' Renderer: ', PChar(glGetString(GL_RENDERER)));
|
|
WriteLn(' Version: ', PChar(glGetString(GL_VERSION)));
|
|
WriteLn(' Extensions: ', PChar(glGetString(GL_EXTENSIONS)));
|
|
|
|
// Enable backface culling
|
|
glEnable(GL_CULL_FACE);
|
|
|
|
// Set up depth buffer
|
|
glEnable(GL_DEPTH_TEST);
|
|
glDepthFunc(GL_LESS);
|
|
|
|
// Set up projection matrix
|
|
glMatrixMode(GL_PROJECTION);
|
|
glLoadIdentity;
|
|
gluPerspective(90, 1.3, 0.1, 100);
|
|
glMatrixMode(GL_MODELVIEW);
|
|
glLoadIdentity;
|
|
glTranslatef(0, 0, -5.5);
|
|
|
|
WriteLn('Starting...');
|
|
glutMainLoop;
|
|
|
|
end.
|