///////////////////////////////////////////////////////////////////////////
//
// Copyright (C) Microsoft Corporation. All Rights Reserved.
//
// File: d3dxsprite.h
// Content: D3DX sprite helper functions
//
// These functions allow you to use sprites with D3DX. A "sprite" is
// loosely defined as a 2D image that you want to transfer to the
// rendering target. The source image can be a texture created
// with the help of the D3DX texture loader; though advanced users may
// want to create their own. A helper function (PrepareDeviceForSprite)
// is provided to make it easy to set up render states on a device.
// (Again, advanced users can use their own created devices.)
//
// There are two general techniques for sprites; the simpler one just
// specifies a destination rectangle and a rotation anlge. A more
// powerful technique supports rendering to non-rectangular quads.
//
// Both techniques support clipping, alpha, and rotation. More
// details are below.
//
///////////////////////////////////////////////////////////////////////////
#ifndef __D3DXSPRITE_H__
#define __D3DXSPRITE_H__
#include <d3d.h>
#include <limits.h>
#include "d3dxerr.h"
#ifdef __cplusplus
extern "C" {
#endif
//-------------------------------------------------------------------------
// D3DXPrepareDeviceForSprite:
//
// Call this function to set up all the render states necessary for
// BltSprite/WarpSprite to work correctly. (Advanced users may opt to
// not call this function first; in which case Blt/WarpSprite functions
// will use whatever render/texture states were set up on the device when
// they are called.)
//
// Warning: This function modifies render states and may impact performance
// negatively on some 3D hardware if it is called too often per frame.
//
// Warning: If the render state changes (other than through calls to
// BltSprite or WarpSprite), you will need to call this function again before
// calling BltSprite or WarpSprite.
//
// Details: This function modifies the the rendering first texture stage and
// it modifies some renderstates for the entire device. Here is the exact
// list:
//
// SetTextureStageState(0, D3DTSS_COLORARG1, D3DTA_TEXTURE);
// SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_SELECTARG1);
// SetTextureStageState(0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE);
// SetTextureStageState(0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE);
// SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_MODULATE);
// SetTextureStageState(0, D3DTSS_MINFILTER, D3DTFN_LINEAR);
// SetTextureStageState(0, D3DTSS_MAGFILTER, D3DTFG_LINEAR);
//
// SetRenderState(D3DRENDERSTATE_SRCBLEND, D3DBLEND_SRCALPHA);
// SetRenderState(D3DRENDERSTATE_DESTBLEND, D3DBLEND_INVSRCALPHA);
// SetRenderState(D3DRENDERSTATE_ALPHABLENDENABLE, TRUE);
//
// Depending on the value of ZEnable parameter, this function will
// will either call
// SetRenderState(D3DRENDERSTATE_ZENABLE, FALSE);
// - or -
// SetRenderState(D3DRENDERSTATE_ZENABLE, TRUE);
//
// Parameters:
// pd3dDevice - a pointer to the d3d device that you wish to prepare
// for use with D3DX Sprite Services
// ZEnable - a flag indicating whether you want the sprites to
// check and update the Z buffer as part of rendering.
// If ZEnable is FALSE, OR you are using
// alpha-blending, then it is necessary to render your
// sprites from back-to-front.
//
//-------------------------------------------------------------------------
#ifdef __cplusplus
HRESULT WINAPI
D3DXPrepareDeviceForSprite( LPDIRECT3DDEVICE7 pd3dDevice,
BOOL ZEnable = FALSE);
#else
HRESULT WINAPI
D3DXPrepareDeviceForSprite( LPDIRECT3DDEVICE7 pd3dDevice,
BOOL ZEnable);
#endif
//-------------------------------------------------------------------------
// The D3DXDrawBasicSprite() function performs blitting of source images onto
// a 3D rendering device. This function only calls SetTexture on the first
// renderstage with the parameter (pd3dTexture) if that parameter is non-null.
// This function assumes that D3DXPrepareDeviceForSprite has been called on
// the device or that caller has in some other way correctly prepared the
// renderstates.
//
// This function supports scaling, rotations, alpha-blending, and choosing
// a source sub-rect.
//
// Rotation angle is specified in radians. Both rotations and scales
// are applied around the center of the sprite; where the center of the
// sprite is half the width/height of the sprite, plus the offset parameter.
//
// Use the offset parameter if you want the sprite's center to be something
// other than the image center.
//
// The destination point indicates where you would like the center of
// the sprite to draw to.
//
// Parameters:
// pd3dTexture - a pointer to the surface containing the texture
// pd3dDevice - a pointer to the d3d device to render to. It is
// assumed that render states are set up. (See
// D3DXPrepareDeviceForSprite)
// ppointDest - a pointer to the target point for the sprite. The
// components of the vector must be in screen
// space.
// alpha - alpha value to apply to sprite. 1.0 means totally
// opaque; and 0.0 means totally transparent.
// WARNING: If you are using alpha, then you should render
// from back to front in order to avoid rendering
// artifacts.
// angleRad - angle of rotation around the 'center' of the rect
// scale - a uniform scale that is applied to the source rect
// to specify the size of the image that is rendered
// pOffset - offset from the center of the source rect to use as the
// center of rotation
// pSourceRect - a rect that indicates what portion of the source
// source texture to use. If NULL is passed, then the
// entire source is used. If the source texture was
// created via D3DX, then the rect should be specified
// in the coordinates of the original image (so that you
// don't have to worry about stretching/scaling that D3DX
// may have done to make the image work with your current
// 3D Device.) Note that horizontal or vertical mirroring
// may be simply accomplished by swapping the left/right
// or top/bottom fields of this RECT.
//-------------------------------------------------------------------------
#ifdef __cplusplus
HRESULT WINAPI
D3DXDrawSpriteSimple(LPDIRECTDRAWSURFACE7 pd3dTexture,
LPDIRECT3DDEVICE7 pd3dDevice,
const D3DXVECTOR3 *ppointDest,
float alpha = 1.0f,
float scale = 1.0f,
float angleRad = 0.0f,
const D3DXVECTOR2 *pOffset = NULL,
const RECT *pSourceRect = NULL);
#else
HRESULT WINAPI
D3DXDrawSpriteSimple(LPDIRECTDRAWSURFACE7 pd3dTexture,
LPDIRECT3DDEVICE7 pd3dDevice,
D3DXVECTOR3 *ppointDest,
float alpha,
float scale,
float angleRad,
D3DXVECTOR2 *pOffset,
RECT *pSourceRect);
#endif
//-------------------------------------------------------------------------
// The D3DXDrawSprite() function transforms source images onto a 3D
// rendering device. It takes a general 4x4 matrix which is use to transform
// the points of a default rect: (left=-.5, top=-.5, right=+.5, bottom=+.5).
// (This default rect was chosen so that it was centered around the origin
// to ease setting up rotations. And it was chosen to have a width/height of one
// to ease setting up scales.)
//
// This function only calls SetTexture on the first
// renderstage with the parameter (pd3dTexture) if that parameter is non-null.
// This function assumes that D3DXPrepareDeviceForSprite has been called on
// the device or that caller has in some other way correctly prepared the
// renderstates.
//
// This function supports alpha-blending, and choosing
// a source sub-rect. (A value of NULL for source sub-rect means the entire
// texture is used.)
//
// Note that if the transformed points have a value for w (the homogenous
// coordinate) that is not 1, then this function will invert it and pass
// that value to D3D as the rhw field of a TLVERTEX. If the value for w is
// zero, then it use 1 as the rhw.
//
// Parameters:
// pd3dTexture - a pointer to the surface containing the texture
// pd3dDevice - a pointer to the d3d device to render to. It is
// assumed that render states are set up. (See
// D3DXPrepareDeviceForSprite)
// pMatrixTransform - 4x4 matrix that specifies the transformation
// that will be applied to the default -.5 to +.5
// rectangle.
// alpha - alpha value to apply to sprite. 1.0 means totally
// opaque; and 0.0 means totally transparent.
// WARNING: If you are using alpha, then you should render
// from back to front in order to avoid rendering
// artifacts.Furthermore, you should avoid scenarios where
// semi-transparent objects intersect.
// pSourceRect - a rect that indicates what portion of the source
// source texture to use. If NULL is passed, then the
// entire source is used. If the source texture was
// created via D3DX, then the rect should be specified
// in the coordinates of the original image (so that you
// don't have to worry about stretching/scaling that D3DX
// may have done to make the image work with your current
// 3D Device.) Note that mirroring may be simply accomplished
// by swapping the left/right or top/bottom fields of
// this RECT.
//
//-------------------------------------------------------------------------
#ifdef __cplusplus
HRESULT WINAPI
D3DXDrawSpriteTransform(LPDIRECTDRAWSURFACE7 pd3dTexture,
LPDIRECT3DDEVICE7 pd3dDevice,
const D3DXMATRIX *pMatrixTransform,
float alpha = 1.0f,
const RECT *pSourceRect = NULL);
#else
HRESULT WINAPI
D3DXDrawSpriteTransform(LPDIRECTDRAWSURFACE7 pd3dTexture,
LPDIRECT3DDEVICE7 pd3dDevice,
D3DXMATRIX *pMatrixTransform,
float alpha,
RECT *pSourceRect);
#endif
//-------------------------------------------------------------------------
// The D3DXBuildSpriteTransform() function is a helper provided which
// creates a matrix corresponding to simple properties. This matrix is
// set up to pass directly to D3DXTransformSprite.
//
// Parameters:
// pMatrix - a pointer to the result matrix
// prectDest - a pointer to the target rectangle for the sprite
// angleRad - angle of rotation around the 'center' of the rect
// pOffset - offset from the center of the source rect to use as the
// center of rotation
//
//-------------------------------------------------------------------------
#ifdef __cplusplus
void WINAPI
D3DXBuildSpriteTransform(D3DXMATRIX *pMatrix,
const RECT *prectDest,
float angleRad = 0.0f,
const D3DXVECTOR2 *pOffset = NULL);
#else
void WINAPI
D3DXBuildSpriteTransform(D3DXMATRIX *pMatrix,
RECT *prectDest,
float angleRad,
D3DXVECTOR2 *pOffset);
#endif
//-------------------------------------------------------------------------
// The D3DXDrawSprite3D() function renders a texture onto a 3D quad. The
// quad ABCD is broken into two triangles ABC and ACD which are rendered
// via DrawPrim.
//
// Parameters:
// pd3dTexture - a pointer to the surface containing the texture
// pd3dDevice - a pointer to the d3d device to render to. It is
// assumed that render states are set up. (See
// D3DXPrepareDeviceForSprite)
// quad - array of 4 points in the following order:
// upper-left, upper-right, lower-right, lower-left.
// If these vectors contain a W, then this function
// will take the reciprocal of that value to pass as
// as the rhw (i.e. reciprocal homogenous w).
// alpha - alpha value to apply to sprite. 1.0 means totally
// opaque; and 0.0 means totally transparent.
// WARNING: If you are using alpha, then you should render
// from back to front in order to avoid rendering
// artifacts.Furthermore, you should avoid scenarios where
// semi-transparent objects intersect.
// pSourceRect - a rect that indicates what portion of the source
// source texture to use. If NULL is passed, then the
// entire source is used. If the source texture was
// created via D3DX, then the rect should be specified
// in the coordinates of the original image (so that you
// don't have to worry about stretching/scaling that D3DX
// may have done to make the image work with your current
// 3D Device.) Note that mirroring may be simply accomplished
// by swapping the left/right or top/bottom fields of
// this RECT.
//-------------------------------------------------------------------------
#ifdef __cplusplus
HRESULT WINAPI
D3DXDrawSprite3D(LPDIRECTDRAWSURFACE7 pd3dTexture,
LPDIRECT3DDEVICE7 pd3dDevice,
const D3DXVECTOR4 quad[4],
float alpha = 1.0f,
const RECT *pSourceRect = NULL);
#else
HRESULT WINAPI
D3DXDrawSprite3D(LPDIRECTDRAWSURFACE7 pd3dTexture,
LPDIRECT3DDEVICE7 pd3dDevice,
D3DXVECTOR4 quad[4],
float alpha,
RECT *pSourceRect);
#endif
#ifdef __cplusplus
} // extern "C"
#endif
#endif // __D3DXSPRITE_H__
