path: root/src/mesa/drivers/dri/i830/i830_span.c

/**************************************************************************

Copyright 2001 VA Linux Systems Inc., Fremont, California.

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/* $XFree86: xc/lib/GL/mesa/src/drv/i830/i830_span.c,v 1.4 2002/12/10 01:26:53 dawes Exp $ */

/**
 * \file i830_span.c
 *
 * Heavily based on the I810 driver, which was written by Keith Whitwell.
 *
 * \author Jeff Hartmann <jhartmann@2d3d.com>
 * \author Keith Whitwell <keith@tungstengraphics.com>
 */

#include "glheader.h"
#include "macros.h"
#include "mtypes.h"
#include "colormac.h"

#include "i830_screen.h"
#include "i830_dri.h"

#include "i830_span.h"
#include "i830_ioctl.h"
#include "swrast/swrast.h"


#define DBG 0

#define LOCAL_VARS						\
   i830ContextPtr imesa = I830_CONTEXT(ctx);                    \
   __DRIdrawablePrivate *dPriv = imesa->mesa_drawable;		\
   i830ScreenPrivate *i830Screen = imesa->i830Screen;		\
   GLuint pitch = i830Screen->backPitch * i830Screen->cpp;	\
   GLuint height = dPriv->h;					\
   char *buf = (char *)(imesa->drawMap +			\
			dPriv->x * i830Screen->cpp +		\
			dPriv->y * pitch);			\
   char *read_buf = (char *)(imesa->readMap +			\
			     dPriv->x * i830Screen->cpp +	\
			     dPriv->y * pitch); 		\
   GLushort p;         						\
   (void) read_buf; (void) buf; (void) p

#define LOCAL_DEPTH_VARS					\
   i830ContextPtr imesa = I830_CONTEXT(ctx);                    \
   __DRIdrawablePrivate *dPriv = imesa->mesa_drawable;		\
   i830ScreenPrivate *i830Screen = imesa->i830Screen;		\
   GLuint pitch = i830Screen->backPitch * i830Screen->cpp;	\
   GLuint height = dPriv->h;					\
   char *buf = (char *)(i830Screen->depth.map +			\
			dPriv->x * i830Screen->cpp +		\
			dPriv->y * pitch)

#define LOCAL_STENCIL_VARS LOCAL_DEPTH_VARS 

#define INIT_MONO_PIXEL(p,color)\
	 p = PACK_COLOR_565(color[0],color[1],color[2])

#define Y_FLIP(_y) (height - _y - 1)

#define HW_LOCK()

#define HW_UNLOCK()

/* 16 bit, 565 rgb color spanline and pixel functions
 */
#define WRITE_RGBA( _x, _y, r, g, b, a )				\
   *(GLushort *)(buf + _x*2 + _y*pitch)  = ( (((int)r & 0xf8) << 8) |	\
		                             (((int)g & 0xfc) << 3) |	\
		                             (((int)b & 0xf8) >> 3))
#define WRITE_PIXEL( _x, _y, p )  \
   *(GLushort *)(buf + _x*2 + _y*pitch) = p

#define READ_RGBA( rgba, _x, _y )				\
do {								\
   GLushort p = *(GLushort *)(read_buf + _x*2 + _y*pitch);	\
   rgba[0] = (((p >> 11) & 0x1f) * 255) / 31;			\
   rgba[1] = (((p >>  5) & 0x3f) * 255) / 63;			\
   rgba[2] = (((p >>  0) & 0x1f) * 255) / 31;			\
   rgba[3] = 255;						\
} while(0)

#define TAG(x) i830##x##_565
#include "spantmp.h"

/* 15 bit, 555 rgb color spanline and pixel functions
 */
#define WRITE_RGBA( _x, _y, r, g, b, a )			\
   *(GLushort *)(buf + _x*2 + _y*pitch)  = (((r & 0xf8) << 7) |	\
		                            ((g & 0xf8) << 3) |	\
                         		    ((b & 0xf8) >> 3))

#define WRITE_PIXEL( _x, _y, p )  \
   *(GLushort *)(buf + _x*2 + _y*pitch)  = p

#define READ_RGBA( rgba, _x, _y )				\
do {								\
   GLushort p = *(GLushort *)(read_buf + _x*2 + _y*pitch);	\
   rgba[0] = (p >> 7) & 0xf8;					\
   rgba[1] = (p >> 3) & 0xf8;					\
   rgba[2] = (p << 3) & 0xf8;					\
   rgba[3] = 255;						\
} while(0)

#define TAG(x) i830##x##_555
#include "spantmp.h"

/* 16 bit depthbuffer functions.
 */
#define WRITE_DEPTH( _x, _y, d ) \
   *(GLushort *)(buf + _x*2 + _y*pitch)  = d;

#define READ_DEPTH( d, _x, _y )	\
   d = *(GLushort *)(buf + _x*2 + _y*pitch);	 


#define TAG(x) i830##x##_z16
#include "depthtmp.h"


#undef LOCAL_VARS
#define LOCAL_VARS					\
   i830ContextPtr imesa = I830_CONTEXT(ctx);                    \
   __DRIdrawablePrivate *dPriv = imesa->driDrawable;	\
   i830ScreenPrivate *i830Screen = imesa->i830Screen;	\
   GLuint pitch = i830Screen->backPitch * i830Screen->cpp;	\
   GLuint height = dPriv->h;				\
   char *buf = (char *)(imesa->drawMap +		\
			dPriv->x * i830Screen->cpp +			\
			dPriv->y * pitch);		\
   char *read_buf = (char *)(imesa->readMap +		\
			     dPriv->x * i830Screen->cpp +		\
			     dPriv->y * pitch); 	\
   GLuint p = I830_CONTEXT( ctx )->MonoColor;         \
   (void) read_buf; (void) buf; (void) p

#undef INIT_MONO_PIXEL
#define INIT_MONO_PIXEL(p,color)\
	 p = PACK_COLOR_888(color[0],color[1],color[2])

/* 32 bit, 8888 argb color spanline and pixel functions
 */
#define WRITE_RGBA(_x, _y, r, g, b, a)			\
    *(GLuint *)(buf + _x*4 + _y*pitch) = ((r << 16) |	\
					  (g << 8)  |	\
					  (b << 0)  |	\
					  (a << 24) )

#define WRITE_PIXEL(_x, _y, p)			\
    *(GLuint *)(buf + _x*4 + _y*pitch) = p


#define READ_RGBA(rgba, _x, _y)					\
    do {							\
	GLuint p = *(GLuint *)(read_buf + _x*4 + _y*pitch);	\
	rgba[0] = (p >> 16) & 0xff;				\
	rgba[1] = (p >> 8)  & 0xff;				\
	rgba[2] = (p >> 0)  & 0xff;				\
	rgba[3] = (p >> 24) & 0xff;				\
    } while (0)

#define TAG(x) i830##x##_8888
#include "spantmp.h"

/* 24 bit depthbuffer functions.
 */
#define WRITE_DEPTH( _x, _y, d )	\
   *(GLuint *)(buf + _x*4 + _y*pitch) = 0xffffff & d;

#define READ_DEPTH( d, _x, _y )		\
   d = *(GLuint *)(buf + _x*4 + _y*pitch) & 0xffffff;

#define TAG(x) i830##x##_z24
#include "depthtmp.h"

/* 24/8 bit interleaved depth/stencil functions
 */
#define WRITE_DEPTH( _x, _y, d ) {			\
   GLuint tmp = *(GLuint *)(buf + _x*4 + _y*pitch);	\
   tmp &= 0xff000000;					\
   tmp |= (d) & 0xffffff;				\
   *(GLuint *)(buf + _x*4 + _y*pitch) = tmp;		\
}

#define READ_DEPTH( d, _x, _y )		\
   d = *(GLuint *)(buf + _x*4 + _y*pitch) & 0xffffff;


#define TAG(x) i830##x##_z24_s8
#include "depthtmp.h"

#define WRITE_STENCIL( _x, _y, d ) {			\
   GLuint tmp = *(GLuint *)(buf + _x*4 + _y*pitch);	\
   tmp &= 0xffffff;					\
   tmp |= (d<<24);					\
   *(GLuint *)(buf + _x*4 + _y*pitch) = tmp;		\
}

#define READ_STENCIL( d, _x, _y )			\
   d = *(GLuint *)(buf + _x*4 + _y*pitch) >> 24;

#define TAG(x) i830##x##_z24_s8
#include "stenciltmp.h"

/*
 * This function is called to specify which buffer to read and write
 * for software rasterization (swrast) fallbacks.  This doesn't necessarily
 * correspond to glDrawBuffer() or glReadBuffer() calls.
 */
#if 000
static void i830SetBuffer(GLcontext *ctx, GLframebuffer *colorBuffer,
                          GLuint bufferBit)
{
   i830ContextPtr imesa = I830_CONTEXT(ctx);
   
   assert( (colorBuffer == imesa->driDrawable->driverPrivate)
	   || (colorBuffer == imesa->driReadable->driverPrivate) );

   imesa->mesa_drawable = (colorBuffer == imesa->driDrawable->driverPrivate)
       ? imesa->driDrawable : imesa->driReadable;
   
   if (bufferBit == BUFFER_BIT_FRONT_LEFT) {
      imesa->drawMap = (char *)imesa->driScreen->pFB;
      imesa->readMap = (char *)imesa->driScreen->pFB;
   } else if (bufferBit == BUFFER_BIT_BACK_LEFT) {
      imesa->drawMap = imesa->i830Screen->back.map;
      imesa->readMap = imesa->i830Screen->back.map;
   } else {
      ASSERT(0);
   }
}
#endif


/* Move locking out to get reasonable span performance.
 */
void i830SpanRenderStart( GLcontext *ctx )
{
   i830ContextPtr imesa = I830_CONTEXT(ctx);
   I830_FIREVERTICES(imesa);
   LOCK_HARDWARE(imesa);
   i830RegetLockQuiescent( imesa );
}

void i830SpanRenderFinish( GLcontext *ctx )
{
   i830ContextPtr imesa = I830_CONTEXT( ctx );
   _swrast_flush( ctx );
   UNLOCK_HARDWARE( imesa );
}

void i830DDInitSpanFuncs( GLcontext *ctx )
{
   struct swrast_device_driver *swdd = _swrast_GetDeviceDriverReference(ctx);
   swdd->SpanRenderStart = i830SpanRenderStart;
   swdd->SpanRenderFinish = i830SpanRenderFinish; 
}


/**
 * Plug in the Get/Put routines for the given driRenderbuffer.
 */
void
i830SetSpanFunctions(driRenderbuffer *drb, const GLvisual *vis)
{
   if (drb->Base.InternalFormat == GL_RGBA) {
      if (vis->redBits == 5 && vis->greenBits == 5 && vis->blueBits == 5) {
         i830InitPointers_555(&drb->Base);
      }
      else if (vis->redBits == 5 && vis->greenBits == 6 && vis->blueBits == 5) {
         i830InitPointers_565(&drb->Base);
      }
      else {
         assert(vis->redBits == 8);
         assert(vis->greenBits == 8);
         assert(vis->blueBits == 8);
         i830InitPointers_8888(&drb->Base);
      }
   }
   else if (drb->Base.InternalFormat == GL_DEPTH_COMPONENT16) {
      i830InitDepthPointers_z16(&drb->Base);
   }
   else if (drb->Base.InternalFormat == GL_DEPTH_COMPONENT24) {
      i830InitDepthPointers_z24_s8(&drb->Base);
   }
   else if (drb->Base.InternalFormat == GL_DEPTH_COMPONENT32) {
      /* not _really_ 32-bit Z */
      i830InitDepthPointers_z24(&drb->Base);
   }
   else if (drb->Base.InternalFormat == GL_STENCIL_INDEX8_EXT) {
      i830InitStencilPointers_z24_s8(&drb->Base);
   }
}