sis_tris.c

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

#define DEPTH_SCALE smesa->depth_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) (smesa->verts + (e * smesa->vertex_size * sizeof(int)))

#define VERT_SET_RGBA( v, c )  					\
do {								\
   sis_color_t *color = (sis_color_t *)&((v)->ui[coloroffset]);	\
   UNCLAMPED_FLOAT_TO_UBYTE(color->red, (c)[0]);		\
   UNCLAMPED_FLOAT_TO_UBYTE(color->green, (c)[1]);		\
   UNCLAMPED_FLOAT_TO_UBYTE(color->blue, (c)[2]);		\
   UNCLAMPED_FLOAT_TO_UBYTE(color->alpha, (c)[3]);		\
} while (0)

#define VERT_COPY_RGBA( v0, v1 ) v0->ui[coloroffset] = v1->ui[coloroffset]

#define VERT_SET_SPEC( v, c )					\
do {								\
   if (specoffset != 0) {					\
      sis_color_t *spec = (sis_color_t *)&((v)->ui[specoffset]); \
      UNCLAMPED_FLOAT_TO_UBYTE(spec->red, (c)[0]);		\
      UNCLAMPED_FLOAT_TO_UBYTE(spec->green, (c)[1]);		\
      UNCLAMPED_FLOAT_TO_UBYTE(spec->blue, (c)[2]);		\
   }								\
} while (0)
#define VERT_COPY_SPEC( v0, v1 )				\
do {								\
   if (specoffset != 0) {					\
      sis_color_t *spec0 = (sis_color_t *)&((v0)->ui[specoffset]); \
      sis_color_t *spec1 = (sis_color_t *)&((v1)->ui[specoffset]); \
      spec0->red   = spec1->red;				\
      spec0->green = spec1->green;				\
      spec0->blue  = spec1->blue; 				\
   }								\
} while (0)

#define VERT_SAVE_RGBA( idx )    color[idx] = v[idx]->ui[coloroffset]
#define VERT_RESTORE_RGBA( idx ) v[idx]->ui[coloroffset] = color[idx]
#define VERT_SAVE_SPEC( idx )    if (specoffset != 0) spec[idx] = v[idx]->ui[specoffset]
#define VERT_RESTORE_SPEC( idx ) if (specoffset != 0) v[idx]->ui[specoffset] = spec[idx]

#define LOCAL_VARS(n)						\
   sisContextPtr smesa = SIS_CONTEXT(ctx);			\
   GLuint color[n], spec[n];					\
   GLuint coloroffset = smesa->coloroffset;			\
   GLuint specoffset = smesa->specoffset;			\
   (void) color; (void) spec; (void) coloroffset; (void) specoffset;

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

#define RASTERIZE(x) if (smesa->hw_primitive != hw_prim[x]) \
                        sisRasterPrimitive( ctx, hw_prim[x] )
#define RENDER_PRIMITIVE smesa->render_primitive
#define IND SIS_FALLBACK_BIT
#define TAG(x) x
#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 (SIS_OFFSET_BIT)
#define TAG(x) x##_offset
#include "tnl_dd/t_dd_tritmp.h"

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

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

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

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

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

#define IND (SIS_TWOSIDE_BIT|SIS_OFFSET_BIT|SIS_UNFILLED_BIT)
#define TAG(x) x##_twoside_offset_unfilled
#include "tnl_dd/t_dd_tritmp.h"

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

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

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

#define IND (SIS_TWOSIDE_BIT|SIS_OFFSET_BIT|SIS_FALLBACK_BIT)
#define TAG(x) x##_twoside_offset_fallback
#include "tnl_dd/t_dd_tritmp.h"

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

#define IND (SIS_OFFSET_BIT|SIS_UNFILLED_BIT|SIS_FALLBACK_BIT)
#define TAG(x) x##_offset_unfilled_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (SIS_TWOSIDE_BIT|SIS_UNFILLED_BIT|SIS_FALLBACK_BIT)
#define TAG(x) x##_twoside_unfilled_fallback
#include "tnl_dd/t_dd_tritmp.h"

#define IND (SIS_TWOSIDE_BIT|SIS_OFFSET_BIT|SIS_UNFILLED_BIT| \
	     SIS_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
sis_fallback_tri( sisContextPtr smesa,
		  sisVertex *v0,
		  sisVertex *v1,
		  sisVertex *v2 )
{
   GLcontext *ctx = smesa->glCtx;
   SWvertex v[3];
   _swsetup_Translate( ctx, v0, &v[0] );
   _swsetup_Translate( ctx, v1, &v[1] );
   _swsetup_Translate( ctx, v2, &v[2] );
   sisSpanRenderStart( ctx );
   _swrast_Triangle( ctx, &v[0], &v[1], &v[2] );
   sisSpanRenderFinish( ctx );
   _swrast_flush( ctx );
}


static void
sis_fallback_line( sisContextPtr smesa,
		   sisVertex *v0,
		   sisVertex *v1 )
{
   GLcontext *ctx = smesa->glCtx;
   SWvertex v[2];
   _swsetup_Translate( ctx, v0, &v[0] );
   _swsetup_Translate( ctx, v1, &v[1] );
   sisSpanRenderStart( ctx );
   _swrast_Line( ctx, &v[0], &v[1] );
   sisSpanRenderFinish( ctx );
   _swrast_flush( ctx );
}


static void
sis_fallback_point( sisContextPtr smesa,
		    sisVertex *v0 )
{
   GLcontext *ctx = smesa->glCtx;
   SWvertex v[1];
   _swsetup_Translate( ctx, v0, &v[0] );
   sisSpanRenderStart( ctx );
   _swrast_Point( ctx, &v[0] );
   sisSpanRenderFinish( ctx );
   _swrast_flush( ctx );
}



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

#define IND 0
#define V(x) (sisVertex *)(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) sisRenderPrimitive( ctx, x )
#undef LOCAL_VARS
#define LOCAL_VARS				\
    sisContextPtr smesa = SIS_CONTEXT(ctx);	\
    const GLuint vertsize = smesa->vertex_size;		\
    const char *vertptr = (char *)smesa->verts;		\
    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) sis_##x##_verts
#include "tnl/t_vb_rendertmp.h"
#undef ELT
#undef TAG
#define TAG(x) sis_##x##_elts
#define ELT(x) elt[x]
#include "tnl/t_vb_rendertmp.h"


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

#define POINT_FALLBACK (DD_POINT_SMOOTH)
#define LINE_FALLBACK (DD_LINE_STIPPLE|DD_LINE_SMOOTH)
#define TRI_FALLBACK (DD_TRI_STIPPLE|DD_TRI_SMOOTH)
#define ANY_FALLBACK_FLAGS (POINT_FALLBACK|LINE_FALLBACK|TRI_FALLBACK)
#define ANY_RASTER_FLAGS (DD_TRI_LIGHT_TWOSIDE|DD_TRI_OFFSET|DD_TRI_UNFILLED)
#define _SIS_NEW_RENDER_STATE (ANY_RASTER_FLAGS | ANY_FALLBACK_FLAGS)

static void sisChooseRenderState(GLcontext *ctx)
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   sisContextPtr smesa = SIS_CONTEXT( ctx );
   GLuint flags = ctx->_TriangleCaps;
   GLuint index = 0;

   if (smesa->Fallback)
      return;

   if (flags & (ANY_RASTER_FLAGS|ANY_FALLBACK_FLAGS)) {

      if (flags & ANY_RASTER_FLAGS) {
	 if (flags & DD_TRI_LIGHT_TWOSIDE) index |= SIS_TWOSIDE_BIT;
	 if (flags & DD_TRI_OFFSET)        index |= SIS_OFFSET_BIT;
	 if (flags & DD_TRI_UNFILLED)      index |= SIS_UNFILLED_BIT;
      }

      smesa->draw_point = sis_point;
      smesa->draw_line = sis_line;
      smesa->draw_tri = sis_triangle;
      /* Hook in fallbacks for specific primitives.
       */
      if (flags & ANY_FALLBACK_FLAGS) {
	 if (flags & POINT_FALLBACK)
            smesa->draw_point = sis_fallback_point;
	 if (flags & LINE_FALLBACK)
            smesa->draw_line = sis_fallback_line;
	 if (flags & TRI_FALLBACK)
            smesa->draw_tri = sis_fallback_tri;
	 index |= SIS_FALLBACK_BIT;
      }
   }

   if (index != smesa->RenderIndex) {
      smesa->RenderIndex = index;

      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 = sis_render_tab_verts;
	 tnl->Driver.Render.PrimTabElts = sis_render_tab_elts;
	 tnl->Driver.Render.ClippedPolygon = sis_fast_clipped_poly;
      } else {
	 tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;
	 tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;
	 tnl->Driver.Render.ClippedPolygon = _tnl_RenderClippedPolygon;
      }
   }
}

/**********************************************************************/
/*                Multipass rendering for front buffering             */
/**********************************************************************/
static GLboolean multipass_cliprect( GLcontext *ctx, GLuint pass )
{
   sisContextPtr smesa = SIS_CONTEXT( ctx );

   if (pass >= smesa->driDrawable->numClipRects) {
      return GL_FALSE;
   } else {
      GLint x1, y1, x2, y2;

      x1 = smesa->driDrawable->pClipRects[pass].x1 - smesa->driDrawable->x;
      y1 = smesa->driDrawable->pClipRects[pass].y1 - smesa->driDrawable->y;
      x2 = smesa->driDrawable->pClipRects[pass].x2 - smesa->driDrawable->x;
      y2 = smesa->driDrawable->pClipRects[pass].y2 - smesa->driDrawable->y;

      if (ctx->Scissor.Enabled) {
         GLint scisy1 = Y_FLIP(ctx->Scissor.Y + ctx->Scissor.Height - 1);
         GLint scisy2 = Y_FLIP(ctx->Scissor.Y);

         if (ctx->Scissor.X > x1)
            x1 = ctx->Scissor.X;
         if (scisy1 > y1)
            y1 = scisy1;
         if (ctx->Scissor.X + ctx->Scissor.Width - 1 < x2)
            x2 = ctx->Scissor.X + ctx->Scissor.Width - 1;
         if (scisy2 < y2)
            y2 = scisy2;
      }

      MMIO(REG_3D_ClipTopBottom, y1 << 13 | y2);
      MMIO(REG_3D_ClipLeftRight, x1 << 13 | x2);
      /* Mark that we clobbered these registers */
      smesa->GlobalFlag |= GFLAG_CLIPPING;
      return GL_TRUE;
   }
}



/**********************************************************************/
/*                 Validate state at pipeline start                   */
/**********************************************************************/

static void sisRunPipeline( GLcontext *ctx )
{
   sisContextPtr smesa = SIS_CONTEXT( ctx );

   if (smesa->NewGLState) {
      SIS_FIREVERTICES(smesa);
      if (smesa->NewGLState & _NEW_TEXTURE) {
	 sisUpdateTextureState(ctx);
      }

      if (smesa->NewGLState & _SIS_NEW_RENDER_STATE)
	 sisChooseRenderState( ctx );

      smesa->NewGLState = 0;
   }

   _tnl_run_pipeline( ctx );

   /* XXX: If we put flushing in sis_state.c and friends, we can avoid this.
    * Is it worth it?
    */
   SIS_FIREVERTICES(smesa);
}