via_tris.c

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

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

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

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

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

#define IND (VIA_TWOSIDE_BIT|VIA_OFFSET_BIT|VIA_FALLBACK_BIT)
#define TAG(x) x##_twoside_offset_fallback
#include "tnl_dd/t_dd_tritmp.h"

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

#define IND (VIA_OFFSET_BIT|VIA_UNFILLED_BIT|VIA_FALLBACK_BIT)
#define TAG(x) x##_offset_unfilled_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (VIA_TWOSIDE_BIT|VIA_UNFILLED_BIT|VIA_FALLBACK_BIT)
#define TAG(x) x##_twoside_unfilled_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (VIA_TWOSIDE_BIT|VIA_OFFSET_BIT|VIA_UNFILLED_BIT| \
             VIA_FALLBACK_BIT)
#define TAG(x) x##_twoside_offset_unfilled_fallback
#include "tnl_dd/t_dd_tritmp.h"


/* Catchall case for flat, separate specular triangles (via has flat
 * diffuse shading, but always does specular color with gouraud).
 */
#undef  DO_FALLBACK
#undef  DO_OFFSET
#undef  DO_UNFILLED
#undef  DO_TWOSIDE
#undef  DO_FLAT
#define DO_FALLBACK (0)
#define DO_OFFSET   (ctx->_TriangleCaps & DD_TRI_OFFSET)
#define DO_UNFILLED (ctx->_TriangleCaps & DD_TRI_UNFILLED)
#define DO_TWOSIDE  (ctx->_TriangleCaps & DD_TRI_LIGHT_TWOSIDE)
#define DO_FLAT     1
#define TAG(x) x##_flat_specular
#define IND VIA_MAX_TRIFUNC
#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();

    init_flat_specular();	/* special! */
}


/***********************************************************************
 *                    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
via_fallback_tri(struct via_context *vmesa,
                 viaVertex *v0,
                 viaVertex *v1,
                 viaVertex *v2)
{    
    GLcontext *ctx = vmesa->glCtx;
    SWvertex v[3];
    _swsetup_Translate(ctx, v0, &v[0]);
    _swsetup_Translate(ctx, v1, &v[1]);
    _swsetup_Translate(ctx, v2, &v[2]);
    viaSpanRenderStart( ctx );
    _swrast_Triangle(ctx, &v[0], &v[1], &v[2]);
    viaSpanRenderFinish( ctx );
}


static void
via_fallback_line(struct via_context *vmesa,
                  viaVertex *v0,
                  viaVertex *v1)
{
    GLcontext *ctx = vmesa->glCtx;
    SWvertex v[2];
    _swsetup_Translate(ctx, v0, &v[0]);
    _swsetup_Translate(ctx, v1, &v[1]);
    viaSpanRenderStart( ctx );
    _swrast_Line(ctx, &v[0], &v[1]);
    viaSpanRenderFinish( ctx );
}


static void
via_fallback_point(struct via_context *vmesa,
                   viaVertex *v0)
{
    GLcontext *ctx = vmesa->glCtx;
    SWvertex v[1];
    _swsetup_Translate(ctx, v0, &v[0]);
    viaSpanRenderStart( ctx );
    _swrast_Point(ctx, &v[0]);
    viaSpanRenderFinish( ctx );
}

static void viaResetLineStipple( GLcontext *ctx )
{
   struct via_context *vmesa = VIA_CONTEXT(ctx);
   vmesa->regCmdB |= HC_HLPrst_MASK;
}

/**********************************************************************/
/*               Render unclipped begin/end objects                   */
/**********************************************************************/
#define IND 0
#define V(x) (viaVertex *)(vertptr + ((x) * vertsize * sizeof(int)))
#define RENDER_POINTS(start, count)   \
    for (; start < count; start++) POINT(V(ELT(start)));
#define RENDER_LINE(v0, v1)         LINE(V(v0), V(v1))
#define RENDER_TRI( v0, v1, v2)     TRI( V(v0), V(v1), V(v2))
#define RENDER_QUAD(v0, v1, v2, v3) QUAD(V(v0), V(v1), V(v2), V(v3))
#define INIT(x) viaRasterPrimitive(ctx, x, hwPrim[x])
#undef LOCAL_VARS
#define LOCAL_VARS                                              \
    struct via_context *vmesa = VIA_CONTEXT(ctx);                     \
    GLubyte *vertptr = (GLubyte *)vmesa->verts;                 \
    const GLuint vertsize = vmesa->vertexSize;          \
    const GLuint * const elt = TNL_CONTEXT(ctx)->vb.Elts;       \
   const GLboolean stipple = ctx->Line.StippleFlag;		\
   (void) elt; (void) stipple;
#define RESET_STIPPLE	if ( stipple ) viaResetLineStipple( ctx );
#define RESET_OCCLUSION
#define PRESERVE_VB_DEFS
#define ELT(x) x
#define TAG(x) via_##x##_verts
#include "tnl/t_vb_rendertmp.h"
#undef ELT
#undef TAG
#define TAG(x) via_##x##_elts
#define ELT(x) elt[x]
#include "tnl/t_vb_rendertmp.h"
#undef ELT
#undef TAG
#undef NEED_EDGEFLAG_SETUP
#undef EDGEFLAG_GET
#undef EDGEFLAG_SET
#undef RESET_OCCLUSION


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



static void viaRenderClippedPoly(GLcontext *ctx, const GLuint *elts,
                                 GLuint n)
{
    TNLcontext *tnl = TNL_CONTEXT(ctx);
    struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
    GLuint prim = VIA_CONTEXT(ctx)->renderPrimitive;

    /* 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 &&
	prim != GL_POLYGON + 1)
       tnl->Driver.Render.PrimitiveNotify( ctx, prim );
}

static void viaRenderClippedLine(GLcontext *ctx, GLuint ii, GLuint jj)
{
    TNLcontext *tnl = TNL_CONTEXT(ctx);
    tnl->Driver.Render.Line(ctx, ii, jj);
}

static void viaFastRenderClippedPoly(GLcontext *ctx, const GLuint *elts,
                                     GLuint n)
{
    struct via_context *vmesa = VIA_CONTEXT(ctx);
    GLuint vertsize = vmesa->vertexSize;
    GLuint *vb = viaExtendPrimitive(vmesa, (n - 2) * 3 * 4 * vertsize);
    GLubyte *vertptr = (GLubyte *)vmesa->verts;
    const GLuint *start = (const GLuint *)V(elts[0]);
    int i;

    for (i = 2; i < n; i++) {
	COPY_DWORDS(vb, vertsize, V(elts[i - 1]));
        COPY_DWORDS(vb, vertsize, V(elts[i]));
	COPY_DWORDS(vb, vertsize, start);	
    }
}


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


#define _VIA_NEW_VERTEX (_NEW_TEXTURE |                         \
                         _DD_NEW_SEPARATE_SPECULAR |            \
                         _DD_NEW_TRI_UNFILLED |                 \
                         _DD_NEW_TRI_LIGHT_TWOSIDE |            \
                         _NEW_FOG)

#define _VIA_NEW_RENDERSTATE (_DD_NEW_LINE_STIPPLE |            \
                              _DD_NEW_TRI_UNFILLED |            \
                              _DD_NEW_TRI_LIGHT_TWOSIDE |       \
                              _DD_NEW_TRI_OFFSET |              \
                              _DD_NEW_TRI_STIPPLE |             \
                              _NEW_POLYGONSTIPPLE)


static void viaChooseRenderState(GLcontext *ctx)
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   struct via_context *vmesa = VIA_CONTEXT(ctx);
   GLuint flags = ctx->_TriangleCaps;
   GLuint index = 0;

   if (vmesa->ptexHack) {
      vmesa->drawPoint = via_ptex_point;
      vmesa->drawLine = via_ptex_line;
      vmesa->drawTri = via_ptex_tri;
      index |= VIA_FALLBACK_BIT;
   }
   else {
      vmesa->drawPoint = via_draw_point;
      vmesa->drawLine = via_draw_line;
      vmesa->drawTri = via_draw_triangle;
   }

   if (flags & (ANY_FALLBACK_FLAGS | ANY_RASTER_FLAGS)) {
      if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
         index |= VIA_TWOSIDE_BIT;
      if (ctx->Polygon.FrontMode != GL_FILL || ctx->Polygon.BackMode != GL_FILL)
         index |= VIA_UNFILLED_BIT;
      if (flags & DD_TRI_OFFSET)
         index |= VIA_OFFSET_BIT;
      if (flags & ANY_FALLBACK_FLAGS)
         index |= VIA_FALLBACK_BIT;

      /* Hook in fallbacks for specific primitives. */
      if (flags & POINT_FALLBACK)
	 vmesa->drawPoint = via_fallback_point;
      
      if (flags & LINE_FALLBACK)
	 vmesa->drawLine = via_fallback_line;

      if (flags & TRI_FALLBACK)
	 vmesa->drawTri = via_fallback_tri;
   }

   if ((flags & DD_SEPARATE_SPECULAR) && ctx->Light.ShadeModel == GL_FLAT)
      index = VIA_MAX_TRIFUNC;	/* flat specular */

   if (vmesa->renderIndex != index) {
      vmesa->renderIndex = index;

      tnl->Driver.Render.Points = rast_tab[index].points;
      tnl->Driver.Render.Line = 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 = via_render_tab_verts;
	 tnl->Driver.Render.PrimTabElts = via_render_tab_elts;
	 tnl->Driver.Render.ClippedLine = line; /* from tritmp.h */
	 tnl->Driver.Render.ClippedPolygon = viaFastRenderClippedPoly;
      }
      else {
	 tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;
	 tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;
	 tnl->Driver.Render.ClippedLine = viaRenderClippedLine;
	 tnl->Driver.Render.ClippedPolygon = viaRenderClippedPoly;
      }
   }
}


#define VIA_EMIT_TEX1	0x01
#define VIA_EMIT_TEX0	0x02
#define VIA_EMIT_PTEX0	0x04
#define VIA_EMIT_RGBA	0x08
#define VIA_EMIT_SPEC	0x10
#define VIA_EMIT_FOG	0x20
#define VIA_EMIT_W	0x40

#define EMIT_ATTR( ATTR, STYLE, INDEX, REGB )				\
do {									\
   vmesa->vertex_attrs[vmesa->vertex_attr_count].attrib = (ATTR);	\
   vmesa->vertex_attrs[vmesa->vertex_attr_count].format = (STYLE);	\
   vmesa->vertex_attr_count++;						\
   setupIndex |= (INDEX);						\
   regCmdB |= (REGB);							\
} while (0)

#define EMIT_PAD( N )							\
do {									\
   vmesa->vertex_attrs[vmesa->vertex_attr_count].attrib = 0;		\
   vmesa->vertex_attrs[vmesa->vertex_attr_count].format = EMIT_PAD;	\
   vmesa->vertex_attrs[vmesa->vertex_attr_count].offset = (N);		\
   vmesa->vertex_attr_count++;						\
} while (0)



static void viaChooseVertexState( GLcontext *ctx )
{
   struct via_context *vmesa = VIA_CONTEXT(ctx);
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   DECLARE_RENDERINPUTS(index_bitset);
   GLuint regCmdB = HC_HVPMSK_X | HC_HVPMSK_Y | HC_HVPMSK_Z;
   GLuint setupIndex = 0;

   RENDERINPUTS_COPY( index_bitset, tnl->render_inputs_bitset );
   vmesa->vertex_attr_count = 0;
 
   /* EMIT_ATTR's must be in order as they tell t_vertex.c how to
    * build up a hardware vertex.
    */
   if (RENDERINPUTS_TEST_RANGE( index_bitset, _TNL_FIRST_TEX, _TNL_LAST_TEX ) ||
       RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_FOG )) {
      EMIT_ATTR( _TNL_ATTRIB_POS, EMIT_4F_VIEWPORT, VIA_EMIT_W, HC_HVPMSK_W );
      vmesa->coloroffset = 4;
   }
   else {
      EMIT_ATTR( _TNL_ATTRIB_POS, EMIT_3F_VIEWPORT, 0, 0 );
      vmesa->coloroffset = 3;
   }

   /* t_context.c always includes a diffuse color */
   EMIT_ATTR( _TNL_ATTRIB_COLOR0, EMIT_4UB_4F_BGRA, VIA_EMIT_RGBA, 
	      HC_HVPMSK_Cd );
      
   vmesa->specoffset = 0;
   if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_COLOR1 ) ||
       RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_FOG )) {
      if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_COLOR1 )) {
	 vmesa->specoffset = vmesa->coloroffset + 1;
	 EMIT_ATTR( _TNL_ATTRIB_COLOR1, EMIT_3UB_3F_BGR, VIA_EMIT_SPEC, 
		    HC_HVPMSK_Cs );
      }
      else
	 EMIT_PAD( 3 );

      if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_FOG ))
	 EMIT_ATTR( _TNL_ATTRIB_FOG, EMIT_1UB_1F, VIA_EMIT_FOG, HC_HVPMSK_Cs );
      else
	 EMIT_PAD( 1 );
   }

   if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_TEX0 )) {
      if (vmesa->ptexHack)
	 EMIT_ATTR( _TNL_ATTRIB_TEX0, EMIT_3F_XYW, VIA_EMIT_PTEX0, 
		    (HC_HVPMSK_S | HC_HVPMSK_T) );
      else 
	 EMIT_ATTR( _TNL_ATTRIB_TEX0, EMIT_2F, VIA_EMIT_TEX0, 
		    (HC_HVPMSK_S | HC_HVPMSK_T) );
   }

   if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_TEX1 )) {
      EMIT_ATTR( _TNL_ATTRIB_TEX1, EMIT_2F, VIA_EMIT_TEX1, 
		 (HC_HVPMSK_S | HC_HVPMSK_T) );