i810tris.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

/* $XFree86: xc/lib/GL/mesa/src/drv/i810/i810tris.c,v 1.7 2002/10/30 12:51:33 alanh Exp $ */
/**************************************************************************

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

All Rights Reserved.

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
on the rights to use, copy, modify, merge, publish, distribute, sub
license, and/or sell copies of the Software, and to permit persons to whom
the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice (including the next
paragraph) shall be included in all copies or substantial portions of the
Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
ATI, VA LINUX SYSTEMS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
USE OR OTHER DEALINGS IN THE SOFTWARE.

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

/*
 * Authors:
 *   Keith Whitwell <[e-mail]>
 */

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

#include "swrast/swrast.h"
#include "swrast_setup/swrast_setup.h"
#include "tnl/t_context.h"
#include "tnl/t_pipeline.h"

#include "i810screen.h"
#include "i810_dri.h"

#include "i810tris.h"
#include "i810state.h"
#include "i810vb.h"
#include "i810ioctl.h"

static void i810RenderPrimitive( GLcontext *ctx, GLenum prim );

/***********************************************************************
 *                    Emit primitives as inline vertices               *
 ***********************************************************************/

#if defined(USE_X86_ASM)
#define COPY_DWORDS( j, vb, vertsize, v )				\
do {									\
	int __tmp;							\
	__asm__ __volatile__( "rep ; movsl"				\
			      : "=%c" (j), "=D" (vb), "=S" (__tmp)	\
			      : "0" (vertsize),				\
			        "D" ((long)vb),				\
			        "S" ((long)v) );			\
} while (0)
#else
#define COPY_DWORDS( j, vb, vertsize, v )				\
do {									\
   for ( j = 0 ; j < vertsize ; j++ )					\
      vb[j] = ((GLuint *)v)[j];						\
   vb += vertsize;							\
} while (0)
#endif

static INLINE void i810_draw_triangle( i810ContextPtr imesa,
					   i810VertexPtr v0,
					   i810VertexPtr v1,
					   i810VertexPtr v2 )
{
   GLuint vertsize = imesa->vertex_size;
   GLuint *vb = i810AllocDmaLow( imesa, 3 * 4 * vertsize );
   int j;

   COPY_DWORDS( j, vb, vertsize, v0 );
   COPY_DWORDS( j, vb, vertsize, v1 );
   COPY_DWORDS( j, vb, vertsize, v2 );
}


static INLINE void i810_draw_quad( i810ContextPtr imesa,
				       i810VertexPtr v0,
				       i810VertexPtr v1,
				       i810VertexPtr v2,
				       i810VertexPtr v3 )
{
   GLuint vertsize = imesa->vertex_size;
   GLuint *vb = i810AllocDmaLow( imesa, 6 * 4 * vertsize );
   int j;

   COPY_DWORDS( j, vb, vertsize, v0 );
   COPY_DWORDS( j, vb, vertsize, v1 );
   COPY_DWORDS( j, vb, vertsize, v3 );
   COPY_DWORDS( j, vb, vertsize, v1 );
   COPY_DWORDS( j, vb, vertsize, v2 );
   COPY_DWORDS( j, vb, vertsize, v3 );
}


static INLINE void i810_draw_point( i810ContextPtr imesa,
					i810VertexPtr tmp )
{
   GLfloat sz = 0.5 * CLAMP(imesa->glCtx->Point.Size,
                            imesa->glCtx->Const.MinPointSize,
                            imesa->glCtx->Const.MaxPointSize);
   int vertsize = imesa->vertex_size;
   GLuint *vb = i810AllocDmaLow( imesa, 2 * 4 * vertsize );
   int j;

   /* Draw a point as a horizontal line.
    */
   *(float *)&vb[0] = tmp->v.x - sz + 0.125;
   for (j = 1 ; j < vertsize ; j++)
      vb[j] = tmp->ui[j];
   vb += vertsize;

   *(float *)&vb[0] = tmp->v.x + sz + 0.125;
   for (j = 1 ; j < vertsize ; j++)
      vb[j] = tmp->ui[j];
   vb += vertsize;
}


static INLINE void i810_draw_line( i810ContextPtr imesa,
				       i810VertexPtr v0,
				       i810VertexPtr v1 )
{
   GLuint vertsize = imesa->vertex_size;
   GLuint *vb = i810AllocDmaLow( imesa, 2 * 4 * vertsize );
   int j;

   COPY_DWORDS( j, vb, vertsize, v0 );
   COPY_DWORDS( j, vb, vertsize, v1 );
}



/***********************************************************************
 *          Macros for t_dd_tritmp.h to draw basic primitives          *
 ***********************************************************************/

#define TRI( a, b, c )				\
do { 						\
   if (0) fprintf(stderr, "hw TRI\n");		\
   if (DO_FALLBACK)				\
      imesa->draw_tri( imesa, a, b, c );	\
   else						\
      i810_draw_triangle( imesa, a, b, c );	\
} while (0)

#define QUAD( a, b, c, d )			\
do { 						\
   if (0) fprintf(stderr, "hw QUAD\n");		\
   if (DO_FALLBACK) {				\
      imesa->draw_tri( imesa, a, b, d );	\
      imesa->draw_tri( imesa, b, c, d );	\
   } else					\
      i810_draw_quad( imesa, a, b, c, d );	\
} while (0)

#define LINE( v0, v1 )				\
do { 						\
   if (0) fprintf(stderr, "hw LINE\n");		\
   if (DO_FALLBACK)				\
      imesa->draw_line( imesa, v0, v1 );	\
   else						\
      i810_draw_line( imesa, v0, v1 );		\
} while (0)

#define POINT( v0 )				\
do { 						\
   if (0) fprintf(stderr, "hw POINT\n");	\
   if (DO_FALLBACK)				\
      imesa->draw_point( imesa, v0 );		\
   else						\
      i810_draw_point( imesa, v0 );		\
} while (0)


/***********************************************************************
 *              Build render functions from dd templates               *
 ***********************************************************************/

#define I810_OFFSET_BIT 	0x01
#define I810_TWOSIDE_BIT	0x02
#define I810_UNFILLED_BIT	0x04
#define I810_FALLBACK_BIT	0x08
#define I810_MAX_TRIFUNC	0x10


static struct {
   tnl_points_func	        points;
   tnl_line_func		line;
   tnl_triangle_func	triangle;
   tnl_quad_func		quad;
} rast_tab[I810_MAX_TRIFUNC];


#define DO_FALLBACK (IND & I810_FALLBACK_BIT)
#define DO_OFFSET   (IND & I810_OFFSET_BIT)
#define DO_UNFILLED (IND & I810_UNFILLED_BIT)
#define DO_TWOSIDE  (IND & I810_TWOSIDE_BIT)
#define DO_FLAT      0
#define DO_TRI       1
#define DO_QUAD      1
#define DO_LINE      1
#define DO_POINTS    1
#define DO_FULL_QUAD 1

#define HAVE_RGBA         1
#define HAVE_SPEC         1
#define HAVE_BACK_COLORS  0
#define HAVE_HW_FLATSHADE 1
#define VERTEX            i810Vertex
#define TAB               rast_tab


#define DEPTH_SCALE (1.0/0xffff)
#define UNFILLED_TRI unfilled_tri
#define UNFILLED_QUAD unfilled_quad
#define VERT_X(_v) _v->v.x
#define VERT_Y(_v) _v->v.y
#define VERT_Z(_v) _v->v.z
#define AREA_IS_CCW( a ) (a > 0)
#define GET_VERTEX(e) (imesa->verts + (e * imesa->vertex_size * sizeof(int)))

#define VERT_SET_RGBA( v, c )  					\
do {								\
   i810_color_t *color = (i810_color_t *)&((v)->ui[coloroffset]);	\
   UNCLAMPED_FLOAT_TO_UBYTE(color->red, (c)[0]);		\
   UNCLAMPED_FLOAT_TO_UBYTE(color->green, (c)[1]);		\
   UNCLAMPED_FLOAT_TO_UBYTE(color->blue, (c)[2]);		\
   UNCLAMPED_FLOAT_TO_UBYTE(color->alpha, (c)[3]);		\
} while (0)

#define VERT_COPY_RGBA( v0, v1 ) v0->ui[coloroffset] = v1->ui[coloroffset]

#define VERT_SET_SPEC( v0, c )					\
do {								\
   if (havespec) {						\
      UNCLAMPED_FLOAT_TO_UBYTE(v0->v.specular.red, (c)[0]);	\
      UNCLAMPED_FLOAT_TO_UBYTE(v0->v.specular.green, (c)[1]);	\
      UNCLAMPED_FLOAT_TO_UBYTE(v0->v.specular.blue, (c)[2]);	\
   }								\
} while (0)
#define VERT_COPY_SPEC( v0, v1 )			\
do {							\
   if (havespec) {					\
      v0->v.specular.red   = v1->v.specular.red;	\
      v0->v.specular.green = v1->v.specular.green;	\
      v0->v.specular.blue  = v1->v.specular.blue; 	\
   }							\
} while (0)

#define VERT_SAVE_RGBA( idx )    color[idx] = v[idx]->ui[coloroffset]
#define VERT_RESTORE_RGBA( idx ) v[idx]->ui[coloroffset] = color[idx]
#define VERT_SAVE_SPEC( idx )    if (havespec) spec[idx] = v[idx]->ui[5]
#define VERT_RESTORE_SPEC( idx ) if (havespec) v[idx]->ui[5] = spec[idx]

#define LOCAL_VARS(n)							\
   i810ContextPtr imesa = I810_CONTEXT(ctx);				\
   GLuint color[n], spec[n];						\
   GLuint coloroffset = (imesa->vertex_size == 4 ? 3 : 4);		\
   GLboolean havespec = (imesa->vertex_size > 4);			\
   (void) color; (void) spec; (void) coloroffset; (void) havespec;


/***********************************************************************
 *                Helpers for rendering unfilled primitives            *
 ***********************************************************************/

static const GLuint hw_prim[GL_POLYGON+1] = {
   PR_LINES,
   PR_LINES,
   PR_LINES,
   PR_LINES,
   PR_TRIANGLES,
   PR_TRIANGLES,
   PR_TRIANGLES,
   PR_TRIANGLES,
   PR_TRIANGLES,
   PR_TRIANGLES
};

#define RASTERIZE(x) if (imesa->hw_primitive != hw_prim[x]) \
                        i810RasterPrimitive( ctx, x, hw_prim[x] )
#define RENDER_PRIMITIVE imesa->render_primitive
#define TAG(x) x
#define IND I810_FALLBACK_BIT
#include "tnl_dd/t_dd_unfilled.h"
#undef IND

/***********************************************************************
 *                      Generate GL render functions                   *
 ***********************************************************************/

#define IND (0)
#define TAG(x) x
#include "tnl_dd/t_dd_tritmp.h"

#define IND (I810_OFFSET_BIT)
#define TAG(x) x##_offset
#include "tnl_dd/t_dd_tritmp.h"

#define IND (I810_TWOSIDE_BIT)
#define TAG(x) x##_twoside
#include "tnl_dd/t_dd_tritmp.h"

#define IND (I810_TWOSIDE_BIT|I810_OFFSET_BIT)
#define TAG(x) x##_twoside_offset
#include "tnl_dd/t_dd_tritmp.h"

#define IND (I810_UNFILLED_BIT)
#define TAG(x) x##_unfilled
#include "tnl_dd/t_dd_tritmp.h"

#define IND (I810_OFFSET_BIT|I810_UNFILLED_BIT)
#define TAG(x) x##_offset_unfilled
#include "tnl_dd/t_dd_tritmp.h"

#define IND (I810_TWOSIDE_BIT|I810_UNFILLED_BIT)
#define TAG(x) x##_twoside_unfilled
#include "tnl_dd/t_dd_tritmp.h"

#define IND (I810_TWOSIDE_BIT|I810_OFFSET_BIT|I810_UNFILLED_BIT)
#define TAG(x) x##_twoside_offset_unfilled
#include "tnl_dd/t_dd_tritmp.h"

#define IND (I810_FALLBACK_BIT)
#define TAG(x) x##_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (I810_OFFSET_BIT|I810_FALLBACK_BIT)
#define TAG(x) x##_offset_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (I810_TWOSIDE_BIT|I810_FALLBACK_BIT)
#define TAG(x) x##_twoside_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (I810_TWOSIDE_BIT|I810_OFFSET_BIT|I810_FALLBACK_BIT)
#define TAG(x) x##_twoside_offset_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (I810_UNFILLED_BIT|I810_FALLBACK_BIT)
#define TAG(x) x##_unfilled_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (I810_OFFSET_BIT|I810_UNFILLED_BIT|I810_FALLBACK_BIT)
#define TAG(x) x##_offset_unfilled_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (I810_TWOSIDE_BIT|I810_UNFILLED_BIT|I810_FALLBACK_BIT)
#define TAG(x) x##_twoside_unfilled_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (I810_TWOSIDE_BIT|I810_OFFSET_BIT|I810_UNFILLED_BIT| \
	     I810_FALLBACK_BIT)
#define TAG(x) x##_twoside_offset_unfilled_fallback
#include "tnl_dd/t_dd_tritmp.h"


static void init_rast_tab( void )
{
   init();
   init_offset();
   init_twoside();
   init_twoside_offset();
   init_unfilled();
   init_offset_unfilled();
   init_twoside_unfilled();
   init_twoside_offset_unfilled();
   init_fallback();
   init_offset_fallback();
   init_twoside_fallback();
   init_twoside_offset_fallback();
   init_unfilled_fallback();
   init_offset_unfilled_fallback();
   init_twoside_unfilled_fallback();
   init_twoside_offset_unfilled_fallback();
}


/***********************************************************************
 *                    Rasterization fallback helpers                   *
 ***********************************************************************/


/* This code is hit only when a mix of accelerated and unaccelerated
 * primitives are being drawn, and only for the unaccelerated
 * primitives.
 */
static void
i810_fallback_tri( i810ContextPtr imesa,
		   i810Vertex *v0,
		   i810Vertex *v1,
		   i810Vertex *v2 )
{
   GLcontext *ctx = imesa->glCtx;
   SWvertex v[3];
   i810_translate_vertex( ctx, v0, &v[0] );
   i810_translate_vertex( ctx, v1, &v[1] );
   i810_translate_vertex( ctx, v2, &v[2] );
   _swrast_Triangle( ctx, &v[0], &v[1], &v[2] );
}


static void
i810_fallback_line( i810ContextPtr imesa,
		    i810Vertex *v0,
		    i810Vertex *v1 )
{
   GLcontext *ctx = imesa->glCtx;
   SWvertex v[2];
   i810_translate_vertex( ctx, v0, &v[0] );
   i810_translate_vertex( ctx, v1, &v[1] );
   _swrast_Line( ctx, &v[0], &v[1] );
}


static void
i810_fallback_point( i810ContextPtr imesa,
		     i810Vertex *v0 )
{
   GLcontext *ctx = imesa->glCtx;