WebSVN - shark - Blame - Rev 80 - /shark/trunk/drivers/svga/accel.h

Rev	Author	Line No.	Line
54	pj	1
		2	#ifndef ACCEL_H
		3	#define ACCEL_H
		4
80	pj	5	#include "ll/sys/cdefs.h"
		6
		7	__BEGIN_DECLS
		8
54	pj	9	/*
		10	* New accelerator interface sketch.
		11	* As of svgalib 1.23, this isn't used yet.
		12	*
		13	* The main goal is to define functions that can be used as part of
		14	* certain kinds of interesting graphical operations (not necessarily
		15	* interesting primitives on their own). Obvious useful primitives
		16	* in their own are FillBox, ScreenCopy, DrawHLineList (solid polygon),
		17	* DrawLine.
		18	*
		19	* An interesting purpose is the fast drawing of color bitmaps, both
		20	* straight and transparent (masked, certain color not written). For
		21	* masked bitmaps ("sprites"), there is a number of possible methods,
		22	* the availability of which depends on the chips. Caching in
		23	* non-visible video memory is often useful. One way is to use a
		24	* transparency color compare feature of a BITBLT chip, either
		25	* transferring the image from system memory or cached in video memory.
		26	* If transparency compare is not available, it may be possible to first
		27	* clear (zeroes) the mask in the destination area, and then use BITBLT
		28	* raster-operation to OR the image into the destination (this requires
		29	* the mask color to be 0). A higher level (library) interface should
		30	* control this kind of operation.
		31	*/
		32
		33
		34	typedef struct {
		35	/* Graphics mode-independent fields. */
		36	int flags;
		37	/*
		38	* The following fields define lists of linewidths in pixel
		39	* units that the accelerator supports for each depth. Each
		40	* list is terminated by 0. These fields are only relevant
		41	* if the ACCELERATE_ANY_LINEWIDTH flag is not set.
		42	*/
		43	int *supportedLineWidths8bpp;
		44	int *supportedLineWidths16bpp;
		45	int *supportedLineWidths24bpp;
		46	int *supportedLineWidths32bpp;
		47	/*
		48	* The following function sets up the accelerator interface for
		49	* pixels of size bpp and scanline width of width_in_pixels.
		50	*/
		51	void (*initAccelerator) (int bpp, int width_in_pixels);
		52	/* Fields that are initialized after setting a graphics mode. */
		53	/*
		54	* The following field defines which accelerated primitives are
		55	* available in the selected graphics mode.
		56	*/
		57	int operations;
		58	/*
		59	* The following field defines which accelerated primitives are
		60	* available with special raster-ops in the selected graphics mode.
		61	*/
		62	int ropOperations;
		63	/*
		64	* The following field defines which special raster operations are
		65	* available in the selected graphics mode.
		66	*/
		67	int ropModes;
		68	/*
		69	* The following field defines which accelerated primitives are
		70	* available with transparency in the selected graphics mode.
		71	*/
		72	int transparencyOperations;
		73	/*
		74	* The following field defines which special transparency modes are
		75	* available in the selected graphics mode.
		76	*/
		77	int transparencyModes;
		78	/* Acceleration primitive functions. */
		79	void (*FillBox) (int x, int y, int width, int height);
		80	void (*ScreenCopy) (int x1, int y1, int x2, int y2, int width,
		81	int height);
		82	void (PutImage) (int x, int y, int width, int height, void image);
		83	void (*DrawLine) (int x1, int y1, int x2, int y2);
		84	void (*SetFGColor) (int c);
		85	void (*SetBGColor) (int c);
		86	void (*SetRasterOp) (int rop);
		87	void (*SetTransparency) (int mode, int color);
		88	void (PutBitmap) (int x, int y, int w, int h, void bitmap);
		89	void (*ScreenCopyBitmap) (int x1, int y1, int x2, int y2, int width,
		90	int height);
		91	void (DrawHLineList) (int ymin, int n, int xmin, int *xmax);
		92	void (*SetMode) (void);
		93	void (*Sync) (void);
		94	} AccelSpecs;
		95
		96	/* Flags: */
		97	/* Every programmable scanline width is supported by the accelerator. */
		98	#define ACCELERATE_ANY_LINEWIDTH 0x1
		99	/* Bitmap (1-bit-per-pixel) operations support transparency (bit = 0). */
		100	#define BITMAP_TRANSPARENCY 0x2
		101	/* For bitmaps (1 bpp) stored in video memory, the most-significant bit */
		102	/* within a byte is the leftmost pixel. */
		103	#define BITMAP_ORDER_MSB_FIRST 0x4
		104
		105	/* Operation flags: see vga.h. */
		106
		107	/*
		108	* Acceleration primitive description:
		109	*
		110	* FillBox Simple solid fill of rectangle with a single color.
		111	* ScreenCopy Screen-to-screen BLT (BitBlt), handles overlapping areas.
		112	* PutImage Straight image transfer (PutImage). Advantage over
		113	* framebuffer writes is mainly in alignment handling.
		114	* DrawLine Draw general line ("zero-pixel wide").
		115	* SetFGColor Set foreground color for some operations (FillBox, DrawLine,
		116	* PutBitmap).
		117	* SetBGColor Set background color for some operations (PutBitmap).
		118	* SetRasterOp Set the raster operation for drawing operations that support
		119	* raster ops as defined in ropOperations.
		120	* SetTransparency
		121	* Set the transparency mode for some operations (enable/disable,
		122	* and the transparency pixel value). Source pixels equal to
		123	* the transparency color are not written. Operations supported
		124	* are ScreenCopy and PutImage, subject to their flags being set
		125	* in the transparencyOperations field.
		126	* PutBitmap Color-expand a bit-wise (bit-per-pixel, each byte is 8 pixels)
		127	* image to the screen with the foreground and background color.
		128	* The lowest order bit of each byte is leftmost on the screen
		129	* (contrary to the VGA tradition), irrespective of the bitmap
		130	* bit order flag. Each scanline is aligned to a multiple of
		131	* 32-bits.
		132	* If the transparency mode is enabled (irrespective of the
		133	* transparency color), then bits that are zero in the bitmap
		134	* are not written (the background color is not used).
		135	* ScreenCopyBitmap
		136	* Color-expand bit-wise bitmap stored in video memory
		137	* (may also support transparency).
		138	* DrawHLineList
		139	* Draw a set of horizontal line segments from top to bottom
		140	* in the foreground color.
		141	* SetMode Set the acceleration mode, e.g. let blits go
		142	* on in the background (program must not access video memory
		143	* when blits can be running).
		144	* Sync Wait for any background blits to finish.
		145	*
		146	* It is not the intention to have alternative non-accelerated routines
		147	* available for each possible operation (library functions should
		148	* take advantage of accelerator functions, rather than the accelerator
		149	* functions being primitives on their own right). If something like
		150	* bit-order reversal is required to implement an accelerated primitive,
		151	* it's still worthwhile if it's still much quicker than similar
		152	* unaccelerated functionality would be.
		153	*
		154	* Strategy for accelerator registers in accelerated functions:
		155	* Foreground color, background color, raster operation and transparency
		156	* compare setting are preserved, source and destination pitch is always
		157	* set to screen pitch (may be temporarily changed and then restored).
		158	*/
		159
		160
		161	/* Macros. */
		162
		163	#define BLTBYTEADDRESS(x, y) \
		164	(y * __svgalib_accel_screenpitchinbytes + x * __svgalib_accel_bytesperpixel)
		165
		166	#define BLTPIXADDRESS(x, y) \
		167	(y * __svgalib_accel_screenpitch + x)
		168
		169	#define SIGNALBLOCK \
		170	{ \
		171	sigset_t sig2block; \
		172	sigemptyset(&sig2block); \
		173	sigaddset(&sig2block,SIGINT); \
		174	sigprocmask(SIG_BLOCK, &sig2block, (sigset_t *)NULL); \
		175	}
		176
		177	#define SIGNALUNBLOCK \
		178	{ \
		179	sigset_t sig2block; \
		180	sigemptyset(&sig2block); \
		181	sigaddset(&sig2block,SIGINT); \
		182	sigprocmask(SIG_UNBLOCK, &sig2block, (sigset_t *)NULL);\
		183	}
		184
		185	/* Variables defined in accel.c */
		186
		187	extern int __svgalib_accel_screenpitch;
		188	extern int __svgalib_accel_bytesperpixel;
		189	extern int __svgalib_accel_screenpitchinbytes;
		190	extern int __svgalib_accel_mode;
		191	extern int __svgalib_accel_bitmaptransparency;
		192
		193	/*
		194	* The following function should be called when the mode is set.
		195	* This is currently done in the setmode driver functions.
		196	*/
		197
		198	void __svgalib_InitializeAcceleratorInterface(ModeInfo * modeinfo);
		199
		200	/*
		201	* The following driver function fills in available accelerator
		202	* primitives for a graphics mode (operations etc.). It could be part
		203	* of the setmode driver function.
		204	*
		205	* void initOperations( AccelSpecs *accelspecs, int bpp, int width_in_pixels );
		206	*/
		207
80	pj	208	__END_DECLS
54	pj	209	#endif

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