tdfx_tris.c

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

/* -*- mode: c; c-basic-offset: 3 -*-
 *
 * Copyright 2000 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
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS 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.
 */
/* $XFree86: xc/lib/GL/mesa/src/drv/tdfx/tdfx_tris.c,v 1.4 2002/10/30 12:52:01 alanh Exp $ */

/* New fixes:
 *	Daniel Borca <[e-mail]>, 19 Jul 2004
 *
 * Authors:
 *    Keith Whitwell <[e-mail]>
 */

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

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

#include "tdfx_tris.h"
#include "tdfx_state.h"
#include "tdfx_vb.h"
#include "tdfx_lock.h"
#include "tdfx_render.h"


static void tdfxRasterPrimitive( GLcontext *ctx, GLenum prim );
static void tdfxRenderPrimitive( GLcontext *ctx, GLenum prim );

static GLenum reduced_prim[GL_POLYGON+1] = {
   GL_POINTS,
   GL_LINES,
   GL_LINES,
   GL_LINES,
   GL_TRIANGLES,
   GL_TRIANGLES,
   GL_TRIANGLES,
   GL_TRIANGLES,
   GL_TRIANGLES,
   GL_TRIANGLES
};

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

#define TRI( a, b, c )				\
do {						\
   if (DO_FALLBACK)				\
      fxMesa->draw_triangle( fxMesa, a, b, c );	\
   else						\
      fxMesa->Glide.grDrawTriangle( a, b, c );	\
} while (0)					\

#define QUAD( a, b, c, d )			\
do {						\
   if (DO_FALLBACK) {				\
      fxMesa->draw_triangle( fxMesa, a, b, d );	\
      fxMesa->draw_triangle( fxMesa, b, c, d );	\
   } else {					\
      tdfxVertex *_v_[4];			\
      _v_[0] = d;				\
      _v_[1] = a;				\
      _v_[2] = b;				\
      _v_[3] = c;				\
      fxMesa->Glide.grDrawVertexArray(GR_TRIANGLE_FAN, 4, _v_);\
      /*fxMesa->Glide.grDrawTriangle( a, b, d );*/\
      /*fxMesa->Glide.grDrawTriangle( b, c, d );*/\
   }						\
} while (0)

#define LINE( v0, v1 )				\
do {						\
   if (DO_FALLBACK)				\
      fxMesa->draw_line( fxMesa, v0, v1 );	\
   else {					\
      v0->x += LINE_X_OFFSET - TRI_X_OFFSET;	\
      v0->y += LINE_Y_OFFSET - TRI_Y_OFFSET;	\
      v1->x += LINE_X_OFFSET - TRI_X_OFFSET;	\
      v1->y += LINE_Y_OFFSET - TRI_Y_OFFSET;	\
      fxMesa->Glide.grDrawLine( v0, v1 );	\
      v0->x -= LINE_X_OFFSET - TRI_X_OFFSET;	\
      v0->y -= LINE_Y_OFFSET - TRI_Y_OFFSET;	\
      v1->x -= LINE_X_OFFSET - TRI_X_OFFSET;	\
      v1->y -= LINE_Y_OFFSET - TRI_Y_OFFSET;	\
   }						\
} while (0)

#define POINT( v0 )				\
do {						\
   if (DO_FALLBACK)				\
      fxMesa->draw_point( fxMesa, v0 );		\
   else {					\
      v0->x += PNT_X_OFFSET - TRI_X_OFFSET;	\
      v0->y += PNT_Y_OFFSET - TRI_Y_OFFSET;	\
      fxMesa->Glide.grDrawPoint( v0 );		\
      v0->x -= PNT_X_OFFSET - TRI_X_OFFSET;	\
      v0->y -= PNT_Y_OFFSET - TRI_Y_OFFSET;	\
   }						\
} while (0)


/***********************************************************************
 *              Fallback to swrast for basic primitives                *
 ***********************************************************************/

/* Build an SWvertex from a hardware vertex. 
 *
 * This code is hit only when a mix of accelerated and unaccelerated
 * primitives are being drawn, and only for the unaccelerated
 * primitives.  
 */
static void 
tdfx_translate_vertex( GLcontext *ctx, const tdfxVertex *src, SWvertex *dst)
{
   tdfxContextPtr fxMesa = TDFX_CONTEXT(ctx);

   if (fxMesa->vertexFormat == TDFX_LAYOUT_TINY) {
      dst->attrib[FRAG_ATTRIB_WPOS][0] = src->x - fxMesa->x_offset;
      dst->attrib[FRAG_ATTRIB_WPOS][1] = src->y - (fxMesa->screen_height - fxMesa->height - fxMesa->y_offset);
      dst->attrib[FRAG_ATTRIB_WPOS][2] = src->z;
      dst->attrib[FRAG_ATTRIB_WPOS][3] = 1.0;

      dst->color[0] = src->color[2];
      dst->color[1] = src->color[1];
      dst->color[2] = src->color[0];
      dst->color[3] = src->color[3];
   } 
   else {
      GLfloat w = 1.0 / src->rhw;

      dst->attrib[FRAG_ATTRIB_WPOS][0] = src->x - fxMesa->x_offset;
      dst->attrib[FRAG_ATTRIB_WPOS][1] = src->y - (fxMesa->screen_height - fxMesa->height - fxMesa->y_offset);
      dst->attrib[FRAG_ATTRIB_WPOS][2] = src->z;
      dst->attrib[FRAG_ATTRIB_WPOS][3] = src->rhw;

      dst->color[0] = src->color[2];
      dst->color[1] = src->color[1];
      dst->color[2] = src->color[0];
      dst->color[3] = src->color[3];

      dst->attrib[FRAG_ATTRIB_TEX0][0] = 1.0 / fxMesa->sScale0 * w * src->tu0;
      dst->attrib[FRAG_ATTRIB_TEX0][1] = 1.0 / fxMesa->tScale0 * w * src->tv0;
      if (fxMesa->vertexFormat == TDFX_LAYOUT_PROJ1 || fxMesa->vertexFormat == TDFX_LAYOUT_PROJ2) {
         dst->attrib[FRAG_ATTRIB_TEX0][3] = w * src->tq0;
      } else {
	 dst->attrib[FRAG_ATTRIB_TEX0][3] = 1.0;
      }

      if (fxMesa->SetupIndex & TDFX_TEX1_BIT) {
         dst->attrib[FRAG_ATTRIB_TEX1][0] = 1.0 / fxMesa->sScale1 * w * src->tu1;
         dst->attrib[FRAG_ATTRIB_TEX1][1] = 1.0 / fxMesa->tScale1 * w * src->tv1;
         if (fxMesa->vertexFormat == TDFX_LAYOUT_PROJ2) {
            dst->attrib[FRAG_ATTRIB_TEX1][3] = w * src->tq1;
         } else {
	    dst->attrib[FRAG_ATTRIB_TEX1][3] = 1.0;
         }
      }
   }

   dst->pointSize = ctx->Point.Size;
}


static void 
tdfx_fallback_tri( tdfxContextPtr fxMesa, 
		   tdfxVertex *v0, 
		   tdfxVertex *v1, 
		   tdfxVertex *v2 )
{
   GLcontext *ctx = fxMesa->glCtx;
   SWvertex v[3];
   tdfx_translate_vertex( ctx, v0, &v[0] );
   tdfx_translate_vertex( ctx, v1, &v[1] );
   tdfx_translate_vertex( ctx, v2, &v[2] );
   _swrast_Triangle( ctx, &v[0], &v[1], &v[2] );
}


static void 
tdfx_fallback_line( tdfxContextPtr fxMesa,
		    tdfxVertex *v0,
		    tdfxVertex *v1 )
{
   GLcontext *ctx = fxMesa->glCtx;
   SWvertex v[2];
   tdfx_translate_vertex( ctx, v0, &v[0] );
   tdfx_translate_vertex( ctx, v1, &v[1] );
   _swrast_Line( ctx, &v[0], &v[1] );
}


static void 
tdfx_fallback_point( tdfxContextPtr fxMesa, 
		     tdfxVertex *v0 )
{
   GLcontext *ctx = fxMesa->glCtx;
   SWvertex v[1];
   tdfx_translate_vertex( ctx, v0, &v[0] );
   _swrast_Point( ctx, &v[0] );
}

/***********************************************************************
 *                 Functions to draw basic primitives                  *
 ***********************************************************************/

static void tdfx_print_vertex( GLcontext *ctx, const tdfxVertex *v )
{
   tdfxContextPtr tmesa = TDFX_CONTEXT( ctx );

   fprintf(stderr, "vertex at %p\n", (void *)v);

   if (tmesa->vertexFormat == TDFX_LAYOUT_TINY) {
      fprintf(stderr, "x %f y %f z %f\n", v->x, v->y, v->z);
   } 
   else {
      fprintf(stderr, "x %f y %f z %f oow %f\n", 
	      v->x, v->y, v->z, v->rhw);
   }
   fprintf(stderr, "r %d g %d b %d a %d\n", 
	      v->color[0],
	      v->color[1],
	      v->color[2],
	      v->color[3]);
   
   fprintf(stderr, "\n");
}

#define DO_FALLBACK 0

/* Need to do clip loop at each triangle when mixing swrast and hw
 * rendering.  These functions are only used when mixed-mode rendering
 * is occurring.
 */
static void tdfx_draw_triangle( tdfxContextPtr fxMesa,
				tdfxVertexPtr v0,
				tdfxVertexPtr v1,
				tdfxVertexPtr v2 )
{
/*     fprintf(stderr, "%s\n", __FUNCTION__); */
/*     tdfx_print_vertex( fxMesa->glCtx, v0 ); */
/*     tdfx_print_vertex( fxMesa->glCtx, v1 ); */
/*     tdfx_print_vertex( fxMesa->glCtx, v2 ); */
   BEGIN_CLIP_LOOP_LOCKED(fxMesa) {
      TRI( v0, v1, v2 );
   } END_CLIP_LOOP_LOCKED(fxMesa);
}

static void tdfx_draw_line( tdfxContextPtr fxMesa,
			    tdfxVertexPtr v0,
			    tdfxVertexPtr v1 )
{
   /* No support for wide lines (avoid wide/aa line fallback).
    */
   BEGIN_CLIP_LOOP_LOCKED(fxMesa) {
      LINE(v0, v1);
   } END_CLIP_LOOP_LOCKED(fxMesa);
}

static void tdfx_draw_point( tdfxContextPtr fxMesa,
			     tdfxVertexPtr v0 )
{
   /* No support for wide points.
    */
   BEGIN_CLIP_LOOP_LOCKED(fxMesa) {
      POINT( v0 );
   } END_CLIP_LOOP_LOCKED(fxMesa);
}

#undef DO_FALLBACK


#define TDFX_UNFILLED_BIT    0x1
#define TDFX_OFFSET_BIT	     0x2
#define TDFX_TWOSIDE_BIT     0x4
#define TDFX_FLAT_BIT        0x8
#define TDFX_FALLBACK_BIT    0x10
#define TDFX_MAX_TRIFUNC     0x20

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

#define DO_FALLBACK (IND & TDFX_FALLBACK_BIT)
#define DO_OFFSET   (IND & TDFX_OFFSET_BIT)
#define DO_UNFILLED (IND & TDFX_UNFILLED_BIT)
#define DO_TWOSIDE  (IND & TDFX_TWOSIDE_BIT)
#define DO_FLAT     (IND & TDFX_FLAT_BIT)
#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   0
#define HAVE_HW_FLATSHADE 0
#define HAVE_BACK_COLORS  0
#define VERTEX tdfxVertex
#define TAB rast_tab

#define DEPTH_SCALE 1.0
#define UNFILLED_TRI unfilled_tri
#define UNFILLED_QUAD unfilled_quad
#define VERT_X(_v) _v->x
#define VERT_Y(_v) _v->y
#define VERT_Z(_v) _v->z
#define AREA_IS_CCW( a ) (a < 0)
#define GET_VERTEX(e) (fxMesa->verts + (e))

#define VERT_SET_RGBA( dst, f )			\
do {						\
   UNCLAMPED_FLOAT_TO_UBYTE(dst->color[2], f[0]);\
   UNCLAMPED_FLOAT_TO_UBYTE(dst->color[1], f[1]);\
   UNCLAMPED_FLOAT_TO_UBYTE(dst->color[0], f[2]);\
   UNCLAMPED_FLOAT_TO_UBYTE(dst->color[3], f[3]);\
} while (0)

#define VERT_COPY_RGBA( v0, v1 ) 		\
   *(GLuint *)&v0->color = *(GLuint *)&v1->color

#define VERT_SAVE_RGBA( idx )  			\
   *(GLuint *)&color[idx] = *(GLuint *)&v[idx]->color

#define VERT_RESTORE_RGBA( idx )		\
   *(GLuint *)&v[idx]->color = *(GLuint *)&color[idx]

#define LOCAL_VARS(n)					\
   tdfxContextPtr fxMesa = TDFX_CONTEXT(ctx);		\
   GLubyte color[n][4];					\
   (void) color;



/***********************************************************************
 *            Functions to draw basic unfilled primitives              *
 ***********************************************************************/

#define RASTERIZE(x) if (fxMesa->raster_primitive != reduced_prim[x]) \
                        tdfxRasterPrimitive( ctx, reduced_prim[x] )
#define RENDER_PRIMITIVE fxMesa->render_primitive
#define IND TDFX_FALLBACK_BIT
#define TAG(x) x
#include "tnl_dd/t_dd_unfilled.h"
#undef IND

/***********************************************************************
 *                 Functions to draw GL primitives                     *
 ***********************************************************************/

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

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

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

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

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

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

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

#define IND (TDFX_TWOSIDE_BIT|TDFX_OFFSET_BIT|TDFX_UNFILLED_BIT)
#define TAG(x) x##_twoside_offset_unfilled
#include "tnl_dd/t_dd_tritmp.h"

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

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

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

#define IND (TDFX_TWOSIDE_BIT|TDFX_OFFSET_BIT|TDFX_FALLBACK_BIT)
#define TAG(x) x##_twoside_offset_fallback
#include "tnl_dd/t_dd_tritmp.h"

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

#define IND (TDFX_OFFSET_BIT|TDFX_UNFILLED_BIT|TDFX_FALLBACK_BIT)