/* $XFree86: xc/lib/GL/mesa/src/drv/r128/r128_tris.h,v 1.2 2000/08/25 13:42:31 dawes Exp $ */
/**************************************************************************

Copyright 1999, 2000 ATI Technologies Inc. and Precision Insight, Inc.,
                                               Cedar Park, Texas.
All Rights Reserved.

Permission is hereby granted, free of charge, to any person obtaining a
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The above copyright notice and this permission notice (including the next
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**************************************************************************/

/*
 * Authors:
 *   Kevin E. Martin <kevin@precisioninsight.com>
 *
 */

#ifndef _R128_TRIS_H_
#define _R128_TRIS_H_

#ifdef GLX_DIRECT_RENDERING

#include "r128_vb.h"

extern void r128DDChooseRenderState(GLcontext *ctx);
extern void r128DDTriangleFuncsInit(void);

#define R128_FLAT_BIT        0x01
#define R128_OFFSET_BIT      0x02
#define R128_TWOSIDE_BIT     0x04
#define R128_FALLBACK_BIT    0x08

/* Draw a triangle from the vertices in the vertex buffer */
static __inline void r128DrawTriangleVB( r128ContextPtr r128ctx,
					 r128Vertex *v0,
					 r128Vertex *v1,
					 r128Vertex *v2 )
{
    int vertsize = r128ctx->vertsize;
    CARD32 *vb = r128AllocVertexDwordsInlined( r128ctx, 3 * vertsize );
    int j;

#if defined (USE_X86_ASM)
    /* GTH: We can safely assume the vertex stride is some number of
     * dwords, and thus a "rep movsd" is okay.  The vb pointer is
     * automagically updated with this instruction, so we don't have
     * to manually take care of incrementing it.
     */
    __asm__ __volatile__( "rep ; movsl"
			  : "=%c" (j)
			  : "0" (vertsize), "D" ((long)vb), "S" ((long)v0)
			  : "memory" );
    __asm__ __volatile__( "rep ; movsl"
			  : "=%c" (j)
			  : "0" (vertsize), "S" ((long)v1)
			  : "memory" );
    __asm__ __volatile__( "rep ; movsl"
			  : "=%c" (j)
			  : "0" (vertsize), "S" ((long)v2)
			  : "memory" );
#else
    for (j = 0 ; j < vertsize ; j++)
        vb[j] = v0->ui[j];

    vb += vertsize;
    for (j = 0 ; j < vertsize ; j++)
        vb[j] = v1->ui[j];

    vb += vertsize;
    for (j = 0 ; j < vertsize ; j++)
        vb[j] = v2->ui[j];
#endif
}

/* Draw a line from the vertices in the vertex buffer */
static __inline void r128DrawLineVB( r128ContextPtr r128ctx,
				     r128Vertex *tmp0,
				     r128Vertex *tmp1,
				     float width )
{
    int vertsize = r128ctx->vertsize;
    CARD32 *vb = r128AllocVertexDwordsInlined( r128ctx, 6 * vertsize );
    float dx, dy, ix, iy;
    int j;

    dx = tmp0->vert1.x - tmp1->vert1.x;
    dy = tmp0->vert1.y - tmp1->vert1.y;

    ix = width * .5; iy = 0;

    if ((ix<.5) && (ix>0.1)) ix = .5; /* I want to see lines with width
					 0.5 also */

    if (dx * dx > dy * dy) {
        iy = ix; ix = 0;
    }

    *(float *)&vb[0] = tmp0->vert1.x - ix;
    *(float *)&vb[1] = tmp0->vert1.y - iy;
    for (j = 2 ; j < vertsize ; j++)
        vb[j] = tmp0->ui[j];
    vb += vertsize;

    *(float *)&vb[0] = tmp1->vert1.x + ix;
    *(float *)&vb[1] = tmp1->vert1.y + iy;
    for (j = 2 ; j < vertsize ; j++)
        vb[j] = tmp1->ui[j];
    vb += vertsize;

    *(float *)&vb[0] = tmp0->vert1.x + ix;
    *(float *)&vb[1] = tmp0->vert1.y + iy;
    for (j = 2 ; j < vertsize ; j++)
        vb[j] = tmp0->ui[j];
    vb += vertsize;

    *(float *)&vb[0] = tmp0->vert1.x - ix;
    *(float *)&vb[1] = tmp0->vert1.y - iy;
    for (j = 2 ; j < vertsize ; j++)
        vb[j] = tmp0->ui[j];
    vb += vertsize;

    *(float *)&vb[0] = tmp1->vert1.x - ix;
    *(float *)&vb[1] = tmp1->vert1.y - iy;
    for (j = 2 ; j < vertsize ; j++)
        vb[j] = tmp1->ui[j];
    vb += vertsize;

    *(float *)&vb[0] = tmp1->vert1.x + ix;
    *(float *)&vb[1] = tmp1->vert1.y + iy;
    for (j = 2 ; j < vertsize ; j++)
        vb[j] = tmp1->ui[j];
}

/* Draw a point from the vertices in the vertex buffer */
static __inline void r128DrawPointVB( r128ContextPtr r128ctx,
				      r128Vertex *tmp, float sz )
{
    int vertsize = r128ctx->vertsize;
    CARD32 *vb = r128AllocVertexDwordsInlined( r128ctx, 6 * vertsize );
    int j;

    *(float *)&vb[0] = tmp->vert1.x - sz;
    *(float *)&vb[1] = tmp->vert1.y - sz;
    for (j = 2 ; j < vertsize ; j++)
	vb[j] = tmp->ui[j];
    vb += vertsize;

    *(float *)&vb[0] = tmp->vert1.x + sz;
    *(float *)&vb[1] = tmp->vert1.y - sz;
    for (j = 2 ; j < vertsize ; j++)
	vb[j] = tmp->ui[j];
    vb += vertsize;

    *(float *)&vb[0] = tmp->vert1.x + sz;
    *(float *)&vb[1] = tmp->vert1.y + sz;
    for (j = 2 ; j < vertsize ; j++)
	vb[j] = tmp->ui[j];
    vb += vertsize;

    *(float *)&vb[0] = tmp->vert1.x + sz;
    *(float *)&vb[1] = tmp->vert1.y + sz;
    for (j = 2 ; j < vertsize ; j++)
	vb[j] = tmp->ui[j];
    vb += vertsize;

    *(float *)&vb[0] = tmp->vert1.x - sz;
    *(float *)&vb[1] = tmp->vert1.y + sz;
    for (j = 2 ; j < vertsize ; j++)
	vb[j] = tmp->ui[j];
    vb += vertsize;

    *(float *)&vb[0] = tmp->vert1.x - sz;
    *(float *)&vb[1] = tmp->vert1.y - sz;
    for (j = 2 ; j < vertsize ; j++)
	vb[j] = tmp->ui[j];
}

#endif
#endif /* _R128_TRIS_H_ */