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program DisplayList;
{$mode objfpc}
uses
ctypes, nds9;
var
triangle: array [0..12] of cuint32; // Display List
rotateX: cfloat = 0.0;
rotateY: cfloat = 0.0;
keys: cuint16;
procedure SetDisplayList;
begin
triangle[0] := 12;
triangle[1] := FIFO_COMMAND_PACK(FIFO_BEGIN, FIFO_COLOR, FIFO_VERTEX16, FIFO_COLOR);
triangle[2] := GL_TRIANGLE;
triangle[3] := RGB15(31,0,0);
triangle[4] := VERTEX_PACK(inttov16(-1),inttov16(-1));
triangle[5] := VERTEX_PACK(0,0);
triangle[6] := RGB15(0,31,0);
triangle[7] := FIFO_COMMAND_PACK(FIFO_VERTEX16, FIFO_COLOR, FIFO_VERTEX16, FIFO_END);
triangle[8] := VERTEX_PACK(inttov16(1),inttov16(-1));
triangle[9] := VERTEX_PACK(0,0);
triangle[10] := RGB15(0,0,31);
triangle[11] := VERTEX_PACK(inttov16(0),inttov16(1));
triangle[12] := VERTEX_PACK(0,0);
end;
begin
//set mode 0, enable BG0 and set it to 3D
videoSetMode(MODE_0_3D);
// initialize gl
glInit();
// enable antialiasing
glEnable(GL_ANTIALIAS);
// setup the rear plane
glClearColor(0,0,0,31); // BG must be opaque for AA to work
glClearPolyID(63); // BG must have a unique polygon ID for AA to work
glClearDepth($7FFF);
//this should work the same as the normal gl call
glViewport(0,0,255,191);
SetDisplayList;
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(70, 256.0 / 192.0, 0.1, 40);
gluLookAt( 0.0, 0.0, 1.0, //camera position
0.0, 0.0, 0.0, //look at
0.0, 1.0, 0.0); //up
while true do
begin
glPushMatrix();
//move it away from the camera
glTranslatef32(0, 0, floattof32(-1.0));
glRotateX(rotateX);
glRotateY(rotateY);
glMatrixMode(GL_TEXTURE);
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
//not a real gl function and will likely change
glPolyFmt(POLY_ALPHA(31) or POLY_CULL_NONE);
scanKeys();
keys := keysHeld();
if (keys and KEY_START) <> 0 then break;
if ((keys and KEY_UP)) <> 0 then rotateX := rotateX + 3;
if ((keys and KEY_DOWN)) <> 0 then rotateX := rotateX - 3;
if ((keys and KEY_LEFT)) <> 0 then rotateY := rotateY + 3;
if ((keys and KEY_RIGHT)) <> 0 then rotateY := rotateY - 3;
glCallList(@triangle);
glPopMatrix(1);
glFlush(0);
end;
end.
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