fxtris.c

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

/*
 * Mesa 3-D graphics library
 * Version:  4.0
 *
 * Copyright (C) 1999-2001  Brian Paul   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 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
 * BRIAN PAUL 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]>
 *    Daniel Borca <[e-mail]>
 */

#include "glheader.h"

#ifdef FX

#include "imports.h"
#include "mtypes.h"
#include "macros.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 "fxdrv.h"


static GLboolean fxMultipass_ColorSum (GLcontext *ctx, GLuint pass);


/*
 * Subpixel offsets to adjust Mesa's (true) window coordinates to
 * Glide coordinates.  We need these to ensure precise rasterization.
 * Otherwise, we'll fail a bunch of conformance tests.
 */
#define TRI_X_OFFSET    ( 0.0F)
#define TRI_Y_OFFSET    ( 0.0F)
#define LINE_X_OFFSET   ( 0.0F)
#define LINE_Y_OFFSET   ( 0.125F)
#define PNT_X_OFFSET    ( 0.375F)
#define PNT_Y_OFFSET    ( 0.375F)

static void fxRasterPrimitive( GLcontext *ctx, GLenum prim );
static void fxRenderPrimitive( 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_tri( fxMesa, a, b, c );	\
   else						\
      grDrawTriangle( a, b, c );	\
} while (0)					\

#define QUAD( a, b, c, d )			\
do {						\
   if (DO_FALLBACK) {				\
      fxMesa->draw_tri( fxMesa, a, b, d );	\
      fxMesa->draw_tri( fxMesa, b, c, d );	\
   } else {					\
      GrVertex *_v_[4];				\
      _v_[0] = d;				\
      _v_[1] = a;				\
      _v_[2] = b;				\
      _v_[3] = c;				\
      grDrawVertexArray(GR_TRIANGLE_FAN, 4, _v_);\
      /*grDrawTriangle( a, b, d );*/		\
      /*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;	\
      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;	\
      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
fx_translate_vertex( GLcontext *ctx, const GrVertex *src, SWvertex *dst)
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   GLuint ts0 = fxMesa->tmu_source[0];
   GLuint ts1 = fxMesa->tmu_source[1];
   GLfloat w = 1.0F / src->oow;

   dst->win[0] = src->x;
   dst->win[1] = src->y;
   dst->win[2] = src->ooz;
   dst->win[3] = src->oow;

#if FX_PACKEDCOLOR
   dst->color[0] = src->pargb[2];
   dst->color[1] = src->pargb[1];
   dst->color[2] = src->pargb[0];
   dst->color[3] = src->pargb[3];

   dst->specular[0] = src->pspec[2];
   dst->specular[1] = src->pspec[1];
   dst->specular[2] = src->pspec[0];
#else  /* !FX_PACKEDCOLOR */
   dst->color[0] = src->r;
   dst->color[1] = src->g;
   dst->color[2] = src->b;
   dst->color[3] = src->a;

   dst->specular[0] = src->r1;
   dst->specular[1] = src->g1;
   dst->specular[2] = src->g1;
#endif /* !FX_PACKEDCOLOR */

   dst->texcoord[ts0][0] = fxMesa->inv_s0scale * src->tmuvtx[0].sow * w;
   dst->texcoord[ts0][1] = fxMesa->inv_t0scale * src->tmuvtx[0].tow * w;

   if (fxMesa->stw_hint_state & GR_STWHINT_W_DIFF_TMU0)
      dst->texcoord[ts0][3] = src->tmuvtx[0].oow * w;
   else
      dst->texcoord[ts0][3] = 1.0F;

   if (fxMesa->SetupIndex & SETUP_TMU1) {
      dst->texcoord[ts1][0] = fxMesa->inv_s1scale * src->tmuvtx[1].sow * w;
      dst->texcoord[ts1][1] = fxMesa->inv_t1scale * src->tmuvtx[1].tow * w;

      if (fxMesa->stw_hint_state & GR_STWHINT_W_DIFF_TMU1)
	 dst->texcoord[ts1][3] = src->tmuvtx[1].oow * w;
      else
	 dst->texcoord[ts1][3] = 1.0F;
   }

   dst->pointSize = src->psize;
}


static void
fx_fallback_tri( fxMesaContext fxMesa,
		   GrVertex *v0,
		   GrVertex *v1,
		   GrVertex *v2 )
{
   GLcontext *ctx = fxMesa->glCtx;
   SWvertex v[3];

   fx_translate_vertex( ctx, v0, &v[0] );
   fx_translate_vertex( ctx, v1, &v[1] );
   fx_translate_vertex( ctx, v2, &v[2] );
   _swrast_Triangle( ctx, &v[0], &v[1], &v[2] );
}


static void
fx_fallback_line( fxMesaContext fxMesa,
		    GrVertex *v0,
		    GrVertex *v1 )
{
   GLcontext *ctx = fxMesa->glCtx;
   SWvertex v[2];
   fx_translate_vertex( ctx, v0, &v[0] );
   fx_translate_vertex( ctx, v1, &v[1] );
   _swrast_Line( ctx, &v[0], &v[1] );
}


static void
fx_fallback_point( fxMesaContext fxMesa,
		     GrVertex *v0 )
{
   GLcontext *ctx = fxMesa->glCtx;
   SWvertex v[1];
   fx_translate_vertex( ctx, v0, &v[0] );
   _swrast_Point( ctx, &v[0] );
}

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

static void fx_print_vertex( GLcontext *ctx, const GrVertex *v )
{
 fprintf(stderr, "fx_print_vertex:\n");

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

 fprintf(stderr, "\tx %f y %f z %f oow %f\n", v->x, v->y, v->ooz, v->oow);
#if FX_PACKEDCOLOR
 fprintf(stderr, "\tr %d g %d b %d a %d\n", v->pargb[2], v->pargb[1], v->pargb[0], v->pargb[3]);
#else  /* !FX_PACKEDCOLOR */
 fprintf(stderr, "\tr %f g %f b %f a %f\n", v->r, v->g, v->b, v->a);
#endif /* !FX_PACKEDCOLOR */

 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 fx_draw_triangle( fxMesaContext fxMesa,
				GrVertex *v0,
				GrVertex *v1,
				GrVertex *v2 )
{
   BEGIN_CLIP_LOOP();
   TRI( v0, v1, v2 );
   END_CLIP_LOOP();
}

static void fx_draw_line( fxMesaContext fxMesa,
			    GrVertex *v0,
			    GrVertex *v1 )
{
   /* No support for wide lines (avoid wide/aa line fallback).
    */
   BEGIN_CLIP_LOOP();
   LINE(v0, v1);
   END_CLIP_LOOP();
}

static void fx_draw_point( fxMesaContext fxMesa,
			     GrVertex *v0 )
{
   /* No support for wide points.
    */
   BEGIN_CLIP_LOOP();
   POINT( v0 );
   END_CLIP_LOOP();
}

#ifndef M_2PI
#define M_2PI 6.28318530717958647692528676655901
#endif
#define __GL_COSF cos
#define __GL_SINF sin
static void fx_draw_point_sprite ( fxMesaContext fxMesa,
				   GrVertex *v0, GLfloat psize )
{
 const GLcontext *ctx = fxMesa->glCtx;

 GLfloat radius;
 GrVertex _v_[4];
 GLuint ts0 = fxMesa->tmu_source[0];
 GLuint ts1 = fxMesa->tmu_source[1];
 GLfloat w = v0->oow;
 GLfloat u0scale = fxMesa->s0scale * w;
 GLfloat v0scale = fxMesa->t0scale * w;
 GLfloat u1scale = fxMesa->s1scale * w;
 GLfloat v1scale = fxMesa->t1scale * w;

 radius = psize / 2.0F;
 _v_[0] = *v0;
 _v_[1] = *v0;
 _v_[2] = *v0;
 _v_[3] = *v0;
 /* CLIP_LOOP ?!? */
 /* point coverage? */
 /* we don't care about culling here (see fxSetupCull) */

 if (ctx->Point.SpriteOrigin == GL_UPPER_LEFT) {
    _v_[0].x -= radius;
    _v_[0].y += radius;
    _v_[1].x += radius;
    _v_[1].y += radius;
    _v_[2].x += radius;
    _v_[2].y -= radius;
    _v_[3].x -= radius;
    _v_[3].y -= radius;
 } else {
    _v_[0].x -= radius;
    _v_[0].y -= radius;
    _v_[1].x += radius;
    _v_[1].y -= radius;
    _v_[2].x += radius;
    _v_[2].y += radius;
    _v_[3].x -= radius;
    _v_[3].y += radius;
 }

 if (ctx->Point.CoordReplace[ts0]) {
    _v_[0].tmuvtx[0].sow = 0;
    _v_[0].tmuvtx[0].tow = 0;
    _v_[1].tmuvtx[0].sow = u0scale;
    _v_[1].tmuvtx[0].tow = 0;
    _v_[2].tmuvtx[0].sow = u0scale;
    _v_[2].tmuvtx[0].tow = v0scale;
    _v_[3].tmuvtx[0].sow = 0;
    _v_[3].tmuvtx[0].tow = v0scale;
 }
 if (ctx->Point.CoordReplace[ts1]) {
    _v_[0].tmuvtx[1].sow = 0;
    _v_[0].tmuvtx[1].tow = 0;
    _v_[1].tmuvtx[1].sow = u1scale;
    _v_[1].tmuvtx[1].tow = 0;
    _v_[2].tmuvtx[1].sow = u1scale;
    _v_[2].tmuvtx[1].tow = v1scale;
    _v_[3].tmuvtx[1].sow = 0;
    _v_[3].tmuvtx[1].tow = v1scale;
 }

 grDrawVertexArrayContiguous(GR_TRIANGLE_FAN, 4, _v_, sizeof(GrVertex));
}

static void fx_draw_point_wide ( fxMesaContext fxMesa,
			         GrVertex *v0 )
{
 GLint i, n;
 GLfloat ang, radius, oon;
 GrVertex vtxB, vtxC;
 GrVertex *_v_[3];

 const GLcontext *ctx = fxMesa->glCtx;
 const GLfloat psize = (ctx->_TriangleCaps & DD_POINT_ATTEN)
                       ? CLAMP(v0->psize, ctx->Point.MinSize, ctx->Point.MaxSize)
                       : ctx->Point._Size; /* clamped */

 if (ctx->Point.PointSprite) {
    fx_draw_point_sprite(fxMesa, v0, psize);
    return;
 }

 _v_[0] = v0;
 _v_[1] = &vtxB;
 _v_[2] = &vtxC;

 radius = psize / 2.0F;
 n = IROUND(psize * 2); /* radius x 4 */
 if (n < 4) n = 4;
 oon = 1.0F / (GLfloat)n;

 /* CLIP_LOOP ?!? */
 /* point coverage? */
 /* we don't care about culling here (see fxSetupCull) */

 vtxB = *v0;
 vtxC = *v0;

 vtxB.x += radius;
 ang = M_2PI * oon;
 vtxC.x += radius * __GL_COSF(ang);
 vtxC.y += radius * __GL_SINF(ang);
 grDrawVertexArray(GR_TRIANGLE_FAN, 3, _v_);
 for (i = 2; i <= n; i++) {
     ang = M_2PI * i * oon;
     vtxC.x = v0->x + radius * __GL_COSF(ang);
     vtxC.y = v0->y + radius * __GL_SINF(ang);
     grDrawVertexArray(GR_TRIANGLE_FAN_CONTINUE, 1, &_v_[2]);
 }
}

static void fx_render_pw_verts( GLcontext *ctx,
				GLuint start,
				GLuint count,
				GLuint flags )
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   GrVertex *fxVB = fxMesa->verts;
   (void) flags;

   fxRenderPrimitive( ctx, GL_POINTS );

   for ( ; start < count ; start++)
      fx_draw_point_wide(fxMesa, fxVB + start);
}

static void fx_render_pw_elts ( GLcontext *ctx,
				GLuint start,
				GLuint count,
				GLuint flags )
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   GrVertex *fxVB = fxMesa->verts;
   const GLuint * const elt = TNL_CONTEXT(ctx)->vb.Elts;
   (void) flags;

   fxRenderPrimitive( ctx, GL_POINTS );

   for ( ; start < count ; start++)
      fx_draw_point_wide(fxMesa, fxVB + elt[start]);
}

static void fx_draw_point_wide_aa ( fxMesaContext fxMesa,
			            GrVertex *v0 )
{
 GLint i, n;
 GLfloat ang, radius, oon;
 GrVertex vtxB, vtxC;

 const GLcontext *ctx = fxMesa->glCtx;
 const GLfloat psize = (ctx->_TriangleCaps & DD_POINT_ATTEN)
                       ? CLAMP(v0->psize, ctx->Point.MinSize, ctx->Point.MaxSize)
                       : ctx->Point._Size; /* clamped */