gamma_tris.c

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

 ***********************************************************************/

static const GLuint hw_prim[GL_POLYGON+1] = {
   B_PrimType_Points,
   B_PrimType_Lines,
   B_PrimType_Lines,
   B_PrimType_Lines,
   B_PrimType_Triangles,
   B_PrimType_Triangles,
   B_PrimType_Triangles,
   B_PrimType_Triangles,
   B_PrimType_Triangles,
   B_PrimType_Triangles
};

static void gammaResetLineStipple( GLcontext *ctx );
static void gammaRasterPrimitive( GLcontext *ctx, GLuint hwprim );
static void gammaRenderPrimitive( GLcontext *ctx, GLenum prim );

#define RASTERIZE(x) if (gmesa->hw_primitive != hw_prim[x]) \
                        gammaRasterPrimitive( ctx, hw_prim[x] )
#define RENDER_PRIMITIVE gmesa->render_primitive
#define TAG(x) x
#define IND GAMMA_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 (GAMMA_OFFSET_BIT)
#define TAG(x) x##_offset
#include "tnl_dd/t_dd_tritmp.h"

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

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

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

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

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

#define IND (GAMMA_TWOSIDE_BIT|GAMMA_OFFSET_BIT|GAMMA_UNFILLED_BIT)
#define TAG(x) x##_twoside_offset_unfilled
#include "tnl_dd/t_dd_tritmp.h"



static void init_render_tab( void )
{
   init();
   init_offset();
   init_twoside();
   init_twoside_offset();
   init_unfilled();
   init_offset_unfilled();
   init_twoside_unfilled();
   init_twoside_offset_unfilled();
}


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

#define VERT(x) (gammaVertex *)(gammaverts + (x * size * sizeof(int)))
#define RENDER_POINTS( start, count )		\
   for ( ; start < count ; start++) 		\
      gmesa->draw_point( gmesa, VERT(start) )
#define RENDER_LINE( v0, v1 ) \
   gmesa->draw_line( gmesa, VERT(v0), VERT(v1) )
#define RENDER_TRI( v0, v1, v2 )  \
   gmesa->draw_tri( gmesa, VERT(v0), VERT(v1), VERT(v2) )
#define RENDER_QUAD( v0, v1, v2, v3 ) \
   gmesa->draw_quad( gmesa, VERT(v0), VERT(v1), VERT(v2), VERT(v3) )
#define INIT(x) gammaRenderPrimitive( ctx, x );
#undef LOCAL_VARS
#define LOCAL_VARS						\
   gammaContextPtr gmesa = GAMMA_CONTEXT(ctx);		\
   const GLuint size = gmesa->vertex_size;		\
   const char *gammaverts = (char *)gmesa->verts;		\
   const GLboolean stipple = ctx->Line.StippleFlag;		\
   (void) stipple;
#define RESET_STIPPLE	if ( stipple ) gammaResetLineStipple( ctx );
#define RESET_OCCLUSION
#define PRESERVE_VB_DEFS
#define ELT(x) (x)
#define TAG(x) gamma_##x##_verts
#include "tnl/t_vb_rendertmp.h"


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

static void gammaRenderClippedPoly( GLcontext *ctx, const GLuint *elts, 
				   GLuint n )
{
   gammaContextPtr gmesa = GAMMA_CONTEXT(ctx);
   struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   GLuint prim = gmesa->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 gammaRenderClippedLine( GLcontext *ctx, GLuint ii, GLuint jj )
{
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   tnl->Driver.Render.Line( ctx, ii, jj );
}


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



#define _GAMMA_NEW_RENDERSTATE (_DD_NEW_TRI_UNFILLED |		\
			       _DD_NEW_TRI_LIGHT_TWOSIDE |	\
			       _DD_NEW_TRI_OFFSET)

#define ANY_RASTER_FLAGS (DD_TRI_LIGHT_TWOSIDE|DD_TRI_OFFSET|DD_TRI_UNFILLED)

static void gammaChooseRenderState(GLcontext *ctx)
{
   gammaContextPtr gmesa = GAMMA_CONTEXT(ctx);
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   GLuint flags = ctx->_TriangleCaps;
   GLuint index = 0;

   if (flags & ANY_RASTER_FLAGS) {
      if (flags & DD_TRI_LIGHT_TWOSIDE)       index |= GAMMA_TWOSIDE_BIT;
      if (flags & DD_TRI_OFFSET)	      index |= GAMMA_OFFSET_BIT;
      if (flags & DD_TRI_UNFILLED)	      index |= GAMMA_UNFILLED_BIT;
   }

   if (gmesa->RenderIndex != index) {
      gmesa->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 (gmesa->RenderIndex == 0)
         tnl->Driver.Render.PrimTabVerts = gamma_render_tab_verts;
      else
         tnl->Driver.Render.PrimTabVerts = _tnl_render_tab_verts;
      tnl->Driver.Render.PrimTabElts = _tnl_render_tab_elts;
      tnl->Driver.Render.ClippedLine = gammaRenderClippedLine;
      tnl->Driver.Render.ClippedPolygon = gammaRenderClippedPoly;
   }
}


/**********************************************************************/
/*                 High level hooks for t_vb_render.c                 */
/**********************************************************************/



/* Determine the rasterized primitive when not drawing unfilled 
 * polygons.
 *
 * Used only for the default render stage which always decomposes
 * primitives to trianges/lines/points.  For the accelerated stage,
 * which renders strips as strips, the equivalent calculations are
 * performed in gammarender.c.
 */

static void gammaRasterPrimitive( GLcontext *ctx, GLuint hwprim )
{
   gammaContextPtr gmesa = GAMMA_CONTEXT(ctx);
   if (gmesa->hw_primitive != hwprim)
      gmesa->hw_primitive = hwprim;
}

static void gammaRenderPrimitive( GLcontext *ctx, GLenum prim )
{
   gammaContextPtr gmesa = GAMMA_CONTEXT(ctx);
   gmesa->render_primitive = prim;
}

static void gammaRunPipeline( GLcontext *ctx )
{
   gammaContextPtr gmesa = GAMMA_CONTEXT(ctx);

   if ( gmesa->new_state )
      gammaDDUpdateHWState( ctx );

   if (gmesa->new_gl_state) {
      if (gmesa->new_gl_state & _NEW_TEXTURE)
	 gammaUpdateTextureState( ctx );

   if (!gmesa->Fallback) {
      if (gmesa->new_gl_state & _GAMMA_NEW_VERTEX)
	 gammaChooseVertexState( ctx );
      
      if (gmesa->new_gl_state & _GAMMA_NEW_RASTER_STATE)
	 gammaChooseRasterState( ctx );
      
      if (gmesa->new_gl_state & _GAMMA_NEW_RENDERSTATE)
	 gammaChooseRenderState( ctx );
   }
      
      gmesa->new_gl_state = 0;
   }

   _tnl_run_pipeline( ctx );
}

static void gammaRenderStart( GLcontext *ctx )
{
   /* Check for projective texturing.  Make sure all texcoord
    * pointers point to something.  (fix in mesa?)  
    */
   gammaCheckTexSizes( ctx );
}

static void gammaRenderFinish( GLcontext *ctx )
{
   if (0)
      _swrast_flush( ctx );	/* never needed */
}

static void gammaResetLineStipple( GLcontext *ctx )
{
   gammaContextPtr gmesa = GAMMA_CONTEXT(ctx);

   /* Reset the hardware stipple counter.
    */
   CHECK_DMA_BUFFER(gmesa, 1);
   WRITE(gmesa->buf, UpdateLineStippleCounters, 0);
}


/**********************************************************************/
/*           Transition to/from hardware rasterization.               */
/**********************************************************************/


void gammaFallback( gammaContextPtr gmesa, GLuint bit, GLboolean mode )
{
   GLcontext *ctx = gmesa->glCtx;
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   GLuint oldfallback = gmesa->Fallback;

   if (mode) {
      gmesa->Fallback |= bit;
      if (oldfallback == 0) {
	 _swsetup_Wakeup( ctx );
	 _tnl_need_projected_coords( ctx, GL_TRUE );
	 gmesa->RenderIndex = ~0;
      }
   }
   else {
      gmesa->Fallback &= ~bit;
      if (oldfallback == bit) {
	 _swrast_flush( ctx );
	 tnl->Driver.Render.Start = gammaRenderStart;
	 tnl->Driver.Render.PrimitiveNotify = gammaRenderPrimitive;
	 tnl->Driver.Render.Finish = gammaRenderFinish;
	 tnl->Driver.Render.BuildVertices = gammaBuildVertices;
         tnl->Driver.Render.ResetLineStipple = gammaResetLineStipple;
	 gmesa->new_gl_state |= (_GAMMA_NEW_RENDERSTATE|
				 _GAMMA_NEW_RASTER_STATE|
				 _GAMMA_NEW_VERTEX);
      }
   }
}


/**********************************************************************/
/*                            Initialization.                         */
/**********************************************************************/


void gammaDDInitTriFuncs( GLcontext *ctx )
{
   gammaContextPtr gmesa = GAMMA_CONTEXT(ctx);
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   static int firsttime = 1;

   if (firsttime) {
      init_rast_tab();
      init_render_tab();
      firsttime = 0;
   }
   
   gmesa->RenderIndex = ~0;

   tnl->Driver.RunPipeline = gammaRunPipeline;
   tnl->Driver.Render.Start = gammaRenderStart;
   tnl->Driver.Render.Finish = gammaRenderFinish; 
   tnl->Driver.Render.PrimitiveNotify = gammaRenderPrimitive;
   tnl->Driver.Render.ResetLineStipple = gammaResetLineStipple;
   tnl->Driver.Render.BuildVertices = gammaBuildVertices;
}