intel_tris.c

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

   else						\
      intel_draw_line( intel, v0, v1 );		\
} while (0)

#define POINT( v0 )				\
do { 						\
   if (DO_FALLBACK)				\
      intel->draw_point( intel, v0 );		\
   else						\
      intel_draw_point( intel, v0 );		\
} while (0)


/***********************************************************************
 *              Build render functions from dd templates               *
 ***********************************************************************/

#define INTEL_OFFSET_BIT 	0x01
#define INTEL_TWOSIDE_BIT	0x02
#define INTEL_UNFILLED_BIT	0x04
#define INTEL_FALLBACK_BIT	0x08
#define INTEL_MAX_TRIFUNC	0x10


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


#define DO_FALLBACK (IND & INTEL_FALLBACK_BIT)
#define DO_OFFSET   (IND & INTEL_OFFSET_BIT)
#define DO_UNFILLED (IND & INTEL_UNFILLED_BIT)
#define DO_TWOSIDE  (IND & INTEL_TWOSIDE_BIT)
#define DO_FLAT      0
#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         1
#define HAVE_BACK_COLORS  0
#define HAVE_HW_FLATSHADE 1
#define VERTEX            intelVertex
#define TAB               rast_tab

/* Only used to pull back colors into vertices (ie, we know color is
 * floating point).
 */
#define INTEL_COLOR( dst, src )				\
do {							\
   UNCLAMPED_FLOAT_TO_UBYTE((dst)[0], (src)[2]);	\
   UNCLAMPED_FLOAT_TO_UBYTE((dst)[1], (src)[1]);	\
   UNCLAMPED_FLOAT_TO_UBYTE((dst)[2], (src)[0]);	\
   UNCLAMPED_FLOAT_TO_UBYTE((dst)[3], (src)[3]);	\
} while (0)

#define INTEL_SPEC( dst, src )				\
do {							\
   UNCLAMPED_FLOAT_TO_UBYTE((dst)[0], (src)[2]);	\
   UNCLAMPED_FLOAT_TO_UBYTE((dst)[1], (src)[1]);	\
   UNCLAMPED_FLOAT_TO_UBYTE((dst)[2], (src)[0]);	\
} while (0)


#define DEPTH_SCALE intel->polygon_offset_scale
#define UNFILLED_TRI unfilled_tri
#define UNFILLED_QUAD unfilled_quad
#define VERT_X(_v) _v->v.x
#define VERT_Y(_v) _v->v.y
#define VERT_Z(_v) _v->v.z
#define AREA_IS_CCW( a ) (a > 0)
#define GET_VERTEX(e) (intel->verts + (e * intel->vertex_size * sizeof(GLuint)))

#define VERT_SET_RGBA( v, c )    if (coloroffset) INTEL_COLOR( v->ub4[coloroffset], c )
#define VERT_COPY_RGBA( v0, v1 ) if (coloroffset) v0->ui[coloroffset] = v1->ui[coloroffset]
#define VERT_SAVE_RGBA( idx )    if (coloroffset) color[idx] = v[idx]->ui[coloroffset]
#define VERT_RESTORE_RGBA( idx ) if (coloroffset) v[idx]->ui[coloroffset] = color[idx]

#define VERT_SET_SPEC( v, c )    if (specoffset) INTEL_SPEC( v->ub4[specoffset], c )
#define VERT_COPY_SPEC( v0, v1 ) if (specoffset) COPY_3V(v0->ub4[specoffset], v1->ub4[specoffset])
#define VERT_SAVE_SPEC( idx )    if (specoffset) spec[idx] = v[idx]->ui[specoffset]
#define VERT_RESTORE_SPEC( idx ) if (specoffset) v[idx]->ui[specoffset] = spec[idx]

#define LOCAL_VARS(n)							\
   struct intel_context *intel = intel_context(ctx);			\
   GLuint color[n] = { 0, }, spec[n] = { 0, };				\
   GLuint coloroffset = intel->coloroffset;				\
   GLboolean specoffset = intel->specoffset;				\
   (void) color; (void) spec; (void) coloroffset; (void) specoffset;


/***********************************************************************
 *                Helpers for rendering unfilled primitives            *
 ***********************************************************************/

static const GLuint hw_prim[GL_POLYGON + 1] = {
   PRIM3D_POINTLIST,
   PRIM3D_LINELIST,
   PRIM3D_LINELIST,
   PRIM3D_LINELIST,
   PRIM3D_TRILIST,
   PRIM3D_TRILIST,
   PRIM3D_TRILIST,
   PRIM3D_TRILIST,
   PRIM3D_TRILIST,
   PRIM3D_TRILIST
};

#define RASTERIZE(x) intelRasterPrimitive( ctx, x, hw_prim[x] )
#define RENDER_PRIMITIVE intel->render_primitive
#define TAG(x) x
#define IND INTEL_FALLBACK_BIT
#include "tnl_dd/t_dd_unfilled.h"
#undef IND

/***********************************************************************
 *                      Generate GL render functions                   *
 ***********************************************************************/

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

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

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

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

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

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

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

#define IND (INTEL_TWOSIDE_BIT|INTEL_OFFSET_BIT|INTEL_UNFILLED_BIT)
#define TAG(x) x##_twoside_offset_unfilled
#include "tnl_dd/t_dd_tritmp.h"

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

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

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

#define IND (INTEL_TWOSIDE_BIT|INTEL_OFFSET_BIT|INTEL_FALLBACK_BIT)
#define TAG(x) x##_twoside_offset_fallback
#include "tnl_dd/t_dd_tritmp.h"

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

#define IND (INTEL_OFFSET_BIT|INTEL_UNFILLED_BIT|INTEL_FALLBACK_BIT)
#define TAG(x) x##_offset_unfilled_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (INTEL_TWOSIDE_BIT|INTEL_UNFILLED_BIT|INTEL_FALLBACK_BIT)
#define TAG(x) x##_twoside_unfilled_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (INTEL_TWOSIDE_BIT|INTEL_OFFSET_BIT|INTEL_UNFILLED_BIT| \
	     INTEL_FALLBACK_BIT)
#define TAG(x) x##_twoside_offset_unfilled_fallback
#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();
}


/***********************************************************************
 *                    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
intel_fallback_tri(struct intel_context *intel,
                   intelVertex * v0, intelVertex * v1, intelVertex * v2)
{
   GLcontext *ctx = &intel->ctx;
   SWvertex v[3];

   if (0)
      fprintf(stderr, "\n%s\n", __FUNCTION__);

   INTEL_FIREVERTICES(intel);

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


static void
intel_fallback_line(struct intel_context *intel,
                    intelVertex * v0, intelVertex * v1)
{
   GLcontext *ctx = &intel->ctx;
   SWvertex v[2];

   if (0)
      fprintf(stderr, "\n%s\n", __FUNCTION__);

   INTEL_FIREVERTICES(intel);

   _swsetup_Translate(ctx, v0, &v[0]);
   _swsetup_Translate(ctx, v1, &v[1]);
   intelSpanRenderStart(ctx);
   _swrast_Line(ctx, &v[0], &v[1]);
   intelSpanRenderFinish(ctx);
}

static void
intel_fallback_point(struct intel_context *intel,
		     intelVertex * v0)
{
   GLcontext *ctx = &intel->ctx;
   SWvertex v[1];

   if (0)
      fprintf(stderr, "\n%s\n", __FUNCTION__);

   INTEL_FIREVERTICES(intel);

   _swsetup_Translate(ctx, v0, &v[0]);
   intelSpanRenderStart(ctx);
   _swrast_Point(ctx, &v[0]);
   intelSpanRenderFinish(ctx);
}


/**********************************************************************/
/*               Render unclipped begin/end objects                   */
/**********************************************************************/

#define IND 0
#define V(x) (intelVertex *)(vertptr + ((x)*vertsize*sizeof(GLuint)))
#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) intelRenderPrimitive( ctx, x )
#undef LOCAL_VARS
#define LOCAL_VARS						\
    struct intel_context *intel = intel_context(ctx);			\
    GLubyte *vertptr = (GLubyte *)intel->verts;			\
    const GLuint vertsize = intel->vertex_size;       	\
    const GLuint * const elt = TNL_CONTEXT(ctx)->vb.Elts;	\
    (void) elt;
#define RESET_STIPPLE
#define RESET_OCCLUSION
#define PRESERVE_VB_DEFS
#define ELT(x) x
#define TAG(x) intel_##x##_verts
#include "tnl/t_vb_rendertmp.h"
#undef ELT
#undef TAG
#define TAG(x) intel_##x##_elts
#define ELT(x) elt[x]
#include "tnl/t_vb_rendertmp.h"

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



static void
intelRenderClippedPoly(GLcontext * ctx, const GLuint * elts, GLuint n)
{
   struct intel_context *intel = intel_context(ctx);
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
   GLuint prim = intel->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
intelRenderClippedLine(GLcontext * ctx, GLuint ii, GLuint jj)
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);

   tnl->Driver.Render.Line(ctx, ii, jj);
}

static void
intelFastRenderClippedPoly(GLcontext * ctx, const GLuint * elts, GLuint n)
{
   struct intel_context *intel = intel_context(ctx);
   const GLuint vertsize = intel->vertex_size;
   GLuint *vb = intelExtendInlinePrimitive(intel, (n - 2) * 3 * vertsize);
   GLubyte *vertptr = (GLubyte *) intel->verts;
   const GLuint *start = (const GLuint *) V(elts[0]);
   int i, j;

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

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




#define ANY_FALLBACK_FLAGS (DD_LINE_STIPPLE | DD_TRI_STIPPLE | DD_POINT_ATTEN | DD_POINT_SMOOTH | DD_TRI_SMOOTH)
#define ANY_RASTER_FLAGS (DD_TRI_LIGHT_TWOSIDE | DD_TRI_OFFSET | DD_TRI_UNFILLED)

void
intelChooseRenderState(GLcontext * ctx)
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   struct intel_context *intel = intel_context(ctx);
   GLuint flags = ctx->_TriangleCaps;
   const struct gl_fragment_program *fprog = ctx->FragmentProgram._Current;
   GLboolean have_wpos = (fprog && (fprog->Base.InputsRead & FRAG_BIT_WPOS));
   GLuint index = 0;

   if (INTEL_DEBUG & DEBUG_STATE)
      fprintf(stderr, "\n%s\n", __FUNCTION__);

   if ((flags & (ANY_FALLBACK_FLAGS | ANY_RASTER_FLAGS)) || have_wpos) {