예제 #1
0
void RageDisplay::LoadMenuPerspective( float fovDegrees, float fVanishPointX, float fVanishPointY )
{
	/* fovDegrees == 0 looks the same as an ortho projection.  However,
	 * we don't want to mess with the ModelView stack because 
	 * EnterPerspectiveMode's preserve location feature expectes there 
	 * not to be any camera transforms.  So, do a true ortho projection
	 * if fovDegrees == 0.  Perhaps it would be more convenient to keep 
	 * separate model and view stacks like D3D?
	 */
	if( fovDegrees == 0 )
	{
 		float left = 0, right = SCREEN_WIDTH, bottom = SCREEN_HEIGHT, top = 0;
		g_ProjectionStack.LoadMatrix( GetOrthoMatrix(left, right, bottom, top, SCREEN_NEAR, SCREEN_FAR) );
 		g_ViewStack.LoadIdentity();
	}
	else
	{
		CLAMP( fovDegrees, 0.1f, 179.9f );
		float fovRadians = fovDegrees / 180.f * PI;
		float theta = fovRadians/2;
		float fDistCameraFromImage = SCREEN_WIDTH/2 / tanf( theta );

		fVanishPointX = SCALE( fVanishPointX, SCREEN_LEFT, SCREEN_RIGHT, SCREEN_RIGHT, SCREEN_LEFT );
		fVanishPointY = SCALE( fVanishPointY, SCREEN_TOP, SCREEN_BOTTOM, SCREEN_BOTTOM, SCREEN_TOP );

		fVanishPointX -= SCREEN_CENTER_X;
		fVanishPointY -= SCREEN_CENTER_Y;


		/* It's the caller's responsibility to push first. */
		g_ProjectionStack.LoadMatrix(
			GetFrustumMatrix(
			  (fVanishPointX-SCREEN_WIDTH/2)/fDistCameraFromImage,
			  (fVanishPointX+SCREEN_WIDTH/2)/fDistCameraFromImage,
			  (fVanishPointY+SCREEN_HEIGHT/2)/fDistCameraFromImage,
			  (fVanishPointY-SCREEN_HEIGHT/2)/fDistCameraFromImage,
			  1,
			  fDistCameraFromImage+1000	) );

		g_ViewStack.LoadMatrix( 
			RageLookAt(
				-fVanishPointX+SCREEN_CENTER_X, -fVanishPointY+SCREEN_CENTER_Y, fDistCameraFromImage,
				-fVanishPointX+SCREEN_CENTER_X, -fVanishPointY+SCREEN_CENTER_Y, 0,
				0.0f, 1.0f, 0.0f) );
	}
}
예제 #2
0
void RageDisplay::LoadMenuPerspective( float fovDegrees, float fWidth, float fHeight, float fVanishPointX, float fVanishPointY )
{
	// fovDegrees == 0 gives ortho projection.
	if( fovDegrees == 0 )
	{
 		float left = 0, right = fWidth, bottom = fHeight, top = 0;
		g_ProjectionStack.LoadMatrix( GetOrthoMatrix(left, right, bottom, top, -1000, +1000) );
 		g_ViewStack.LoadIdentity();
	}
	else
	{
		CLAMP( fovDegrees, 0.1f, 179.9f );
		float fovRadians = fovDegrees / 180.f * PI;
		float theta = fovRadians/2;
		float fDistCameraFromImage = fWidth/2 / tanf( theta );

		fVanishPointX = SCALE( fVanishPointX, 0, fWidth, fWidth, 0 );
		fVanishPointY = SCALE( fVanishPointY, 0, fHeight, fHeight, 0 );

		fVanishPointX -= fWidth/2;
		fVanishPointY -= fHeight/2;

		// It's the caller's responsibility to push first.
		g_ProjectionStack.LoadMatrix(
			GetFrustumMatrix(
			  (fVanishPointX-fWidth/2)/fDistCameraFromImage,
			  (fVanishPointX+fWidth/2)/fDistCameraFromImage,
			  (fVanishPointY+fHeight/2)/fDistCameraFromImage,
			  (fVanishPointY-fHeight/2)/fDistCameraFromImage,
			  1,
			  fDistCameraFromImage+1000	) );

		g_ViewStack.LoadMatrix( 
			RageLookAt(
				-fVanishPointX+fWidth/2, -fVanishPointY+fHeight/2, fDistCameraFromImage,
				-fVanishPointX+fWidth/2, -fVanishPointY+fHeight/2, 0,
				0.0f, 1.0f, 0.0f) );
	}
}
예제 #3
0
void RageDisplay::LoadIdentity()
{
	g_WorldStack.LoadIdentity();
}