Teapot Colony Wars: src/Accum.cpp File Reference

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Functions
void	accFrustum (GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble near, GLdouble far, GLdouble pixdx, GLdouble pixdy, GLdouble eyedx, GLdouble eyedy, GLdouble focus)
	Multiply the current matrix by a perspective matrix, adding jittering effect.
void	accPerspective (GLdouble fovy, GLdouble aspect, GLdouble near, GLdouble far, GLdouble pixdx, GLdouble pixdy, GLdouble eyedx, GLdouble eyedy, GLdouble focus)
	Set up a perspective projection matrix, adding jittering effect.

Detailed Description

Function Documentation

void accFrustum	(	GLdouble	left,
		GLdouble	right,
		GLdouble	bottom,
		GLdouble	top,
		GLdouble	near,
		GLdouble	far,
		GLdouble	pixdx,
		GLdouble	pixdy,
		GLdouble	eyedx,
		GLdouble	eyedy,
		GLdouble	focus
	)

Multiply the current matrix by a perspective matrix, adding jittering effect.

Parameters:

	left	the coordinates for the left vertical clipping plane
	right	the coordinates for the right vertical clipping plane
	bottom	the coordinates for the bottom horizontal clipping plane
	top	the coordinates for the top horizontal clipping plane
	near	the distance to the near depth clipping plane. Must be positive
	far	the distance to the far depth clipping plane. Must be positive
	pixdx	anti-alias x jitter in pixels
	pixdy	anti-alias y jitter in pixels
	eyedx	depth-of field x jitter in pixels
	eyedy	depth-of field y jitter in pixels
	focus	distance from eye to plane in focus

Definition at line 68 of file Accum.cpp.

Referenced by accPerspective().

00071 {
00072   // make a frustum for use with the accumulation buffer
00073   GLdouble xwsize, ywsize;
00074   GLdouble dx, dy;
00075   GLint viewport[4];
00076 
00077   glGetIntegerv(GL_VIEWPORT, viewport);
00078   xwsize = right - left;
00079   ywsize = top - bottom;
00080   dx = -(pixdx * xwsize / (GLdouble)viewport[2] + eyedx * near / focus);
00081   dy = -(pixdx * ywsize / (GLdouble)viewport[3] + eyedy * near / focus);
00082 
00083   glMatrixMode(GL_PROJECTION);
00084   glLoadIdentity();
00085 
00086   glFrustum(left + dx, right + dx, bottom + dy, top + dy, near, far);
00087   glMatrixMode(GL_MODELVIEW);
00088   glLoadIdentity();
00089   glTranslatef(-eyedx, -eyedy, 0.0);
00090 }

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void accPerspective	(	GLdouble	fovy,
		GLdouble	aspect,
		GLdouble	near,
		GLdouble	far,
		GLdouble	pixdx,
		GLdouble	pixdy,
		GLdouble	eyedx,
		GLdouble	eyedy,
		GLdouble	focus
	)

Set up a perspective projection matrix, adding jittering effect.

Parameters:

	fovy	Specifies the field of view angle, in degrees, in the y direction
	aspect	Specifies the aspect ratio that determines the field of view in the x direction
	near	Specifies the distance from the viewer to the near clipping plane (always positive)
	far	Specifies the distance from the viewer to the far clipping plane (always positive)
	pixdx	anti-alias x jitter in pixels
	pixdy	anti-alias y jitter in pixels
	eyedx	depth-of field x jitter in pixels
	eyedy	depth-of field y jitter in pixels
	focus	distance from eye to plane in focus

Definition at line 92 of file Accum.cpp.

References accFrustum(), and PI.

Referenced by Display::draw().

00095 {
00096   GLdouble fov2, left, right, bottom, top;
00097   fov2 = ((fovy * PI) / 180.0) / 2.0;
00098 
00099   top = near / (cos(fov2) / sin(fov2));
00100   bottom = -top;
00101   right = top * aspect;
00102   left = -right;
00103 
00104   accFrustum(left, right, bottom, top, near, far,
00105              pixdx, pixdy, eyedx, eyedy, focus);
00106 }

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src/Accum.cpp File Reference

Functions

Detailed Description

Function Documentation