fxtris.c

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

#define TAG(x) fx_##x##_verts
#define ELT(x) x
/*#include "tnl_dd/t_dd_rendertmp.h"*/ /* we have fx_render_vb_* now */



/**********************************************************************/
/*                   Render clipped primitives                        */
/**********************************************************************/



static void fxRenderClippedPoly( GLcontext *ctx, const GLuint *elts,
				   GLuint n )
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   struct vertex_buffer *VB = &tnl->vb;
   GLuint prim = fxMesa->render_primitive;

   /* Render the new vertices as an unclipped polygon.
    */
   {
      GLuint *tmp = VB->Elts;
      VB->Elts = (GLuint *)elts;
      tnl->Driver.Render.PrimTabElts[GL_POLYGON]( ctx, 0, n,
						  PRIM_BEGIN|PRIM_END );
      VB->Elts = tmp;
   }

   /* Restore the render primitive
    */
   if (prim != GL_POLYGON)
      tnl->Driver.Render.PrimitiveNotify( ctx, prim );
}


static void fxFastRenderClippedPoly( GLcontext *ctx, const GLuint *elts,
				       GLuint n )
{
   int i;
   fxMesaContext fxMesa = FX_CONTEXT( ctx );
   GrVertex *vertptr = fxMesa->verts;
   if (n == 3) {
      grDrawTriangle( VERT(elts[0]), VERT(elts[1]), VERT(elts[2]) );
   } else if (n <= 32) {
      GrVertex *newvptr[32];
      for (i = 0 ; i < n ; i++) {
         newvptr[i] = VERT(elts[i]);
      }
      grDrawVertexArray(GR_TRIANGLE_FAN, n, newvptr);
   } else {
      const GrVertex *start = VERT(elts[0]);
      for (i = 2 ; i < n ; i++) {
         grDrawTriangle( start, VERT(elts[i-1]), VERT(elts[i]) );
      }
   }
}

/**********************************************************************/
/*                    Choose render functions                         */
/**********************************************************************/


#define POINT_FALLBACK (DD_POINT_SMOOTH)
#define LINE_FALLBACK (DD_LINE_STIPPLE)
#define TRI_FALLBACK (DD_TRI_SMOOTH | DD_TRI_STIPPLE)
#define ANY_FALLBACK_FLAGS (POINT_FALLBACK | LINE_FALLBACK | TRI_FALLBACK)
#define ANY_RASTER_FLAGS (DD_FLATSHADE | DD_TRI_LIGHT_TWOSIDE | DD_TRI_OFFSET \
			  | DD_TRI_UNFILLED | DD_TRI_TWOSTENCIL)



void fxDDChooseRenderState(GLcontext *ctx)
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   GLuint flags = ctx->_TriangleCaps;
   GLuint index = 0;

   if (flags & (ANY_FALLBACK_FLAGS|ANY_RASTER_FLAGS)) {
      if (flags & ANY_RASTER_FLAGS) {
	 if (flags & DD_TRI_TWOSTENCIL)       index |= FX_TWOSTENCIL_BIT;
	 if (flags & DD_TRI_LIGHT_TWOSIDE)    index |= FX_TWOSIDE_BIT;
	 if (flags & DD_TRI_OFFSET)	      index |= FX_OFFSET_BIT;
	 if (flags & DD_TRI_UNFILLED)	      index |= FX_UNFILLED_BIT;
	 if (flags & DD_FLATSHADE)	      index |= FX_FLAT_BIT;
      }

      fxMesa->draw_point = fx_draw_point;
      fxMesa->draw_line = fx_draw_line;
      fxMesa->draw_tri = fx_draw_triangle;

      /* Hook in fallbacks for specific primitives. */
      if (flags & (POINT_FALLBACK|
		   LINE_FALLBACK|
		   TRI_FALLBACK))
      {
         if (fxMesa->verbose) {
            fprintf(stderr, "Voodoo ! fallback (%x), raster (%x)\n",
                            flags & ANY_FALLBACK_FLAGS, flags & ANY_RASTER_FLAGS);
         }

	 if (flags & POINT_FALLBACK)
	    fxMesa->draw_point = fx_fallback_point;

	 if (flags & LINE_FALLBACK)
	    fxMesa->draw_line = fx_fallback_line;

	 if (flags & TRI_FALLBACK)
	    fxMesa->draw_tri = fx_fallback_tri;

	 index |= FX_FALLBACK_BIT;
      }
   }

   tnl->Driver.Render.Points = rast_tab[index].points;
   tnl->Driver.Render.Line = rast_tab[index].line;
   tnl->Driver.Render.ClippedLine = rast_tab[index].line;
   tnl->Driver.Render.Triangle = rast_tab[index].triangle;
   tnl->Driver.Render.Quad = rast_tab[index].quad;

   if (index == 0) {
      tnl->Driver.Render.PrimTabVerts = fx_render_tab_verts;
      tnl->Driver.Render.PrimTabElts = fx_render_tab_elts;
      tnl->Driver.Render.ClippedPolygon = fxFastRenderClippedPoly;
   } else {
      tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;
      tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;
      tnl->Driver.Render.ClippedPolygon = fxRenderClippedPoly;
   }

   fxMesa->render_index = index;

   /* [dBorca] Hack alert: more a trick than a real plug-in!!! */
   if (flags & (DD_POINT_SIZE | DD_POINT_ATTEN)) {
      /* We need to set the point primitive to go through "rast_tab",
       * to make sure "POINT" calls "fxMesa->draw_point" instead of
       * "grDrawPoint". We can achieve this by using FX_FALLBACK_BIT
       * (not really a total rasterization fallback, so we don't alter
       * "fxMesa->render_index"). If we get here with DD_POINT_SMOOTH,
       * we're done, cos we've already set _tnl_render_tab_{verts|elts}
       * above. Otherwise, the T&L engine can optimize point rendering
       * by using fx_render_tab_{verts|elts} hence the extra work.
       */
      if (flags & DD_POINT_SMOOTH) {
         fxMesa->draw_point = fx_draw_point_wide_aa;
      } else {
         fxMesa->draw_point = fx_draw_point_wide;
         fx_render_tab_verts[0] = fx_render_pw_verts;
         fx_render_tab_elts[0] = fx_render_pw_elts;
      }
      tnl->Driver.Render.Points = rast_tab[index|FX_FALLBACK_BIT].points;
   } else {
      fx_render_tab_verts[0] = fx_render_vb_points;
      fx_render_tab_elts[0] = fx_render_points_elts;
   }
}


/**********************************************************************/
/*                Runtime render state and callbacks                  */
/**********************************************************************/

static void fxRunPipeline( GLcontext *ctx )
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   GLuint new_gl_state = fxMesa->new_gl_state;

   if (TDFX_DEBUG & VERBOSE_PIPELINE) {
      fprintf(stderr, "fxRunPipeline()\n");
   }

#if 0
   /* Recalculate fog table on projection matrix changes.  This used to
    * be triggered by the NearFar callback.
    */
   if (new_gl_state & _NEW_PROJECTION)
      fxMesa->new_state |= FX_NEW_FOG;
#endif

   if (new_gl_state & _FX_NEW_IS_IN_HARDWARE)
      fxCheckIsInHardware(ctx);

   if (fxMesa->new_state)
      fxSetupFXUnits(ctx);

   if (!fxMesa->fallback) {
      if (new_gl_state & _FX_NEW_RENDERSTATE)
         fxDDChooseRenderState(ctx);

      if (new_gl_state & _FX_NEW_SETUP_FUNCTION)
         fxChooseVertexState(ctx);
   }

   if (new_gl_state & _NEW_TEXTURE) {
      struct gl_texture_unit *t0 = &ctx->Texture.Unit[fxMesa->tmu_source[0]];
      struct gl_texture_unit *t1 = &ctx->Texture.Unit[fxMesa->tmu_source[1]];

      if (t0->_Current && FX_TEXTURE_DATA(t0)) {
         fxMesa->s0scale = FX_TEXTURE_DATA(t0)->sScale;
         fxMesa->t0scale = FX_TEXTURE_DATA(t0)->tScale;
         fxMesa->inv_s0scale = 1.0F / fxMesa->s0scale;
         fxMesa->inv_t0scale = 1.0F / fxMesa->t0scale;
      }

      if (t1->_Current && FX_TEXTURE_DATA(t1)) {
         fxMesa->s1scale = FX_TEXTURE_DATA(t1)->sScale;
         fxMesa->t1scale = FX_TEXTURE_DATA(t1)->tScale;
         fxMesa->inv_s1scale = 1.0F / fxMesa->s1scale;
         fxMesa->inv_t1scale = 1.0F / fxMesa->t1scale;
      }
   }

   fxMesa->new_gl_state = 0;

   _tnl_run_pipeline( ctx );
}



/* Always called between RenderStart and RenderFinish --> We already
 * hold the lock.
 */
static void fxRasterPrimitive( GLcontext *ctx, GLenum prim )
{
   fxMesaContext fxMesa = FX_CONTEXT( ctx );

   fxMesa->raster_primitive = prim;

   fxSetupCull(ctx);
}



/* Determine the rasterized primitive when not drawing unfilled
 * polygons.
 */
static void fxRenderPrimitive( GLcontext *ctx, GLenum prim )
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   GLuint rprim = reduced_prim[prim];

   fxMesa->render_primitive = prim;

   if (rprim == GL_TRIANGLES && (ctx->_TriangleCaps & DD_TRI_UNFILLED))
      return;

   if (fxMesa->raster_primitive != rprim) {
      fxRasterPrimitive( ctx, rprim );
   }
}

static void fxRenderFinish( GLcontext *ctx )
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);

   if (fxMesa->render_index & FX_FALLBACK_BIT)
      _swrast_flush( ctx );
}



/**********************************************************************/
/*               Manage total rasterization fallbacks                 */
/**********************************************************************/

static char *fallbackStrings[] = {
   "3D/Rect/Cube Texture map",
   "glDrawBuffer(GL_FRONT_AND_BACK)",
   "Separate specular color",
   "glEnable/Disable(GL_STENCIL_TEST)",
   "glRenderMode(selection or feedback)",
   "glLogicOp()",
   "Texture env mode",
   "Texture border",
   "glColorMask",
   "blend mode",
   "multitex"
};


static char *getFallbackString(GLuint bit)
{
   int i = 0;
   while (bit > 1) {
      i++;
      bit >>= 1;
   }
   return fallbackStrings[i];
}


void fxCheckIsInHardware( GLcontext *ctx )
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   GLuint oldfallback = fxMesa->fallback;
   GLuint newfallback = fxMesa->fallback = fx_check_IsInHardware( ctx );

   if (newfallback) {
      if (oldfallback == 0) {
         if (fxMesa->verbose) {
            fprintf(stderr, "Voodoo ! enter SW 0x%08x %s\n", newfallback, getFallbackString(newfallback));
         }
	 _swsetup_Wakeup( ctx );
      }
   }
   else {
      if (oldfallback) {
	 _swrast_flush( ctx );
	 tnl->Driver.Render.Start = fxCheckTexSizes;
	 tnl->Driver.Render.Finish = fxRenderFinish;
	 tnl->Driver.Render.PrimitiveNotify = fxRenderPrimitive;
	 tnl->Driver.Render.ClippedPolygon = _tnl_RenderClippedPolygon;
	 tnl->Driver.Render.ClippedLine = _tnl_RenderClippedLine;
	 tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;
	 tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;
	 tnl->Driver.Render.ResetLineStipple = _swrast_ResetLineStipple;
	 tnl->Driver.Render.BuildVertices = fxBuildVertices;
	 fxChooseVertexState(ctx);
	 fxDDChooseRenderState(ctx);
         if (fxMesa->verbose) {
            fprintf(stderr, "Voodoo ! leave SW 0x%08x %s\n", oldfallback, getFallbackString(oldfallback));
         }
      }
      tnl->Driver.Render.Multipass = NULL;
      if (HAVE_SPEC && NEED_SECONDARY_COLOR(ctx)) {
         tnl->Driver.Render.Multipass = fxMultipass_ColorSum;
         /* obey stencil, but do not change it */
         fxMesa->multipass = GL_TRUE;
         if (fxMesa->unitsState.stencilEnabled) {
            fxMesa->new_state |= FX_NEW_STENCIL;
         }
      }
   }
}

void fxDDInitTriFuncs( GLcontext *ctx )
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   static int firsttime = 1;

   if (firsttime) {
      init_rast_tab();
      firsttime = 0;
   }

   tnl->Driver.RunPipeline = fxRunPipeline;
   tnl->Driver.Render.Start = fxCheckTexSizes;
   tnl->Driver.Render.Finish = fxRenderFinish;
   tnl->Driver.Render.PrimitiveNotify = fxRenderPrimitive;
   tnl->Driver.Render.ClippedPolygon = _tnl_RenderClippedPolygon;
   tnl->Driver.Render.ClippedLine = _tnl_RenderClippedLine;
   tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;
   tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;
   tnl->Driver.Render.ResetLineStipple = _swrast_ResetLineStipple;
   tnl->Driver.Render.BuildVertices = fxBuildVertices;
   tnl->Driver.Render.Multipass = NULL;

   (void) fx_print_vertex;
}


/* [dBorca] Hack alert:
 * doesn't work with blending.
 */
static GLboolean
fxMultipass_ColorSum (GLcontext *ctx, GLuint pass)
{
 fxMesaContext fxMesa = FX_CONTEXT(ctx);
 tfxUnitsState *us = &fxMesa->unitsState;

 static int t0 = 0;
 static int t1 = 0;

 switch (pass) {
        case 1: /* first pass: the TEXTURED triangles are drawn */
             /* set stencil's real values */
             fxMesa->multipass = GL_FALSE;
             if (us->stencilEnabled) {
                fxSetupStencil(ctx);
             }
             /* save per-pass data */
             fxMesa->restoreUnitsState = *us;
             /* turn off texturing */
             t0 = ctx->Texture.Unit[0]._ReallyEnabled;
             t1 = ctx->Texture.Unit[1]._ReallyEnabled;
             ctx->Texture.Unit[0]._ReallyEnabled = 0;
             ctx->Texture.Unit[1]._ReallyEnabled = 0;
             /* SUM the colors */
             fxDDBlendEquationSeparate(ctx, GL_FUNC_ADD, GL_FUNC_ADD);
             fxDDBlendFuncSeparate(ctx, GL_ONE, GL_ONE, GL_ZERO, GL_ONE);
             fxDDEnable(ctx, GL_BLEND, GL_TRUE);
             /* make sure we draw only where we want to */
             if (us->depthTestEnabled) {
                switch (us->depthTestFunc) {
                   default:
                      fxDDDepthFunc(ctx, GL_EQUAL);
                   case GL_NEVER:
                   case GL_ALWAYS:
                      ;
                }
                fxDDDepthMask(ctx, GL_FALSE);
             }
             /* switch to secondary colors */
#if FX_PACKEDCOLOR
             grVertexLayout(GR_PARAM_PARGB, GR_VERTEX_PSPEC_OFFSET << 2, GR_PARAM_ENABLE);
#else  /* !FX_PACKEDCOLOR */
             grVertexLayout(GR_PARAM_RGB, GR_VERTEX_SPEC_OFFSET << 2, GR_PARAM_ENABLE);
#endif /* !FX_PACKEDCOLOR */
             /* don't advertise new state */
             fxMesa->new_state = 0;
             break;
        case 2: /* 2nd pass (last): the secondary color is summed over texture */
             /* restore original state */
             *us = fxMesa->restoreUnitsState;
             /* restore texturing */
             ctx->Texture.Unit[0]._ReallyEnabled = t0;
             ctx->Texture.Unit[1]._ReallyEnabled = t1;
             /* revert to primary colors */
#if FX_PACKEDCOLOR
             grVertexLayout(GR_PARAM_PARGB, GR_VERTEX_PARGB_OFFSET << 2, GR_PARAM_ENABLE);
#else  /* !FX_PACKEDCOLOR */
             grVertexLayout(GR_PARAM_RGB, GR_VERTEX_RGB_OFFSET << 2, GR_PARAM_ENABLE);
#endif /* !FX_PACKEDCOLOR */
             break;
        default:
             assert(0); /* NOTREACHED */
 }

 /* update HW state */
 fxSetupBlend(ctx);
 fxSetupDepthTest(ctx);
 fxSetupTexture(ctx);

 return (pass == 1);
}


#else


/*
 * Need this to provide at least one external definition.
 */

extern int gl_fx_dummy_function_tris(void);
int
gl_fx_dummy_function_tris(void)
{
   return 0;
}

#endif /* FX */