radeon_tcl.c

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

#define EXP_FOG_MAX .0006595
#define FOG_INCR (FOG_MAX/FOG_EXP_TABLE_SIZE)
static GLfloat exp_table[FOG_EXP_TABLE_SIZE];

#if 1
#define NEG_EXP( result, narg )						\
do {									\
   GLfloat f = (GLfloat) (narg * (1.0/FOG_INCR));			\
   GLint k = (GLint) f;							\
   if (k > FOG_EXP_TABLE_SIZE-2) 					\
      result = (GLfloat) EXP_FOG_MAX;					\
   else									\
      result = exp_table[k] + (f-k)*(exp_table[k+1]-exp_table[k]);	\
} while (0)
#else
#define NEG_EXP( result, narg )					\
do {								\
   result = exp(-narg);						\
} while (0)
#endif


/**
 * Initialize the exp_table[] lookup table for approximating exp().
 */
void
radeonInitStaticFogData( void )
{
   GLfloat f = 0.0F;
   GLint i = 0;
   for ( ; i < FOG_EXP_TABLE_SIZE ; i++, f += FOG_INCR) {
      exp_table[i] = (GLfloat) exp(-f);
   }
}


/**
 * Compute per-vertex fog blend factors from fog coordinates by
 * evaluating the GL_LINEAR, GL_EXP or GL_EXP2 fog function.
 * Fog coordinates are distances from the eye (typically between the
 * near and far clip plane distances).
 * Note the fog (eye Z) coords may be negative so we use ABS(z) below.
 * Fog blend factors are in the range [0,1].
 */
float
radeonComputeFogBlendFactor( GLcontext *ctx, GLfloat fogcoord )
{
   GLfloat end  = ctx->Fog.End;
   GLfloat d, temp;
   const GLfloat z = FABSF(fogcoord);

   switch (ctx->Fog.Mode) {
   case GL_LINEAR:
      if (ctx->Fog.Start == ctx->Fog.End)
         d = 1.0F;
      else
         d = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
      temp = (end - z) * d;
      return CLAMP(temp, 0.0F, 1.0F);
      break;
   case GL_EXP:
      d = ctx->Fog.Density;
      NEG_EXP( temp, d * z );
      return temp;
      break;
   case GL_EXP2:
      d = ctx->Fog.Density*ctx->Fog.Density;
      NEG_EXP( temp, d * z * z );
      return temp;
      break;
   default:
      _mesa_problem(ctx, "Bad fog mode in make_fog_coord");
      return 0;
   }
}

/**********************************************************************/
/*                          Render pipeline stage                     */
/**********************************************************************/


/* TCL render.
 */
static GLboolean radeon_run_tcl_render( GLcontext *ctx,
					struct tnl_pipeline_stage *stage )
{
   radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   struct vertex_buffer *VB = &tnl->vb;
   GLuint inputs = VERT_BIT_POS | VERT_BIT_COLOR0;
   GLuint i;

   /* TODO: separate this from the swtnl pipeline 
    */
   if (rmesa->TclFallback)
      return GL_TRUE;	/* fallback to software t&l */

   if (VB->Count == 0)
      return GL_FALSE;

   /* NOTE: inputs != tnl->render_inputs - these are the untransformed
    * inputs.
    */
   if (ctx->Light.Enabled) {
      inputs |= VERT_BIT_NORMAL;
   }

   if (ctx->_TriangleCaps & DD_SEPARATE_SPECULAR) {
      inputs |= VERT_BIT_COLOR1;
   }

   if ( (ctx->Fog.FogCoordinateSource == GL_FOG_COORD) && ctx->Fog.Enabled ) {
      inputs |= VERT_BIT_FOG;
   }

   for (i = 0 ; i < ctx->Const.MaxTextureUnits; i++) {
      if (ctx->Texture.Unit[i]._ReallyEnabled) {
      /* TODO: probably should not emit texture coords when texgen is enabled */
	 if (rmesa->TexGenNeedNormals[i]) {
	    inputs |= VERT_BIT_NORMAL;
	 }
	 inputs |= VERT_BIT_TEX(i);
      }
   }

   radeonReleaseArrays( ctx, ~0 );
   radeonEmitArrays( ctx, inputs );

   rmesa->tcl.Elts = VB->Elts;

   for (i = 0 ; i < VB->PrimitiveCount ; i++)
   {
      GLuint prim = _tnl_translate_prim(&VB->Primitive[i]);
      GLuint start = VB->Primitive[i].start;
      GLuint length = VB->Primitive[i].count;

      if (!length)
	 continue;

      if (rmesa->tcl.Elts)
	 radeonEmitEltPrimitive( ctx, start, start+length, prim );
      else
	 radeonEmitPrimitive( ctx, start, start+length, prim );
   }

   return GL_FALSE;		/* finished the pipe */
}



/* Initial state for tcl stage.  
 */
const struct tnl_pipeline_stage _radeon_tcl_stage =
{
   "radeon render",
   NULL,
   NULL,
   NULL,
   NULL,
   radeon_run_tcl_render	/* run */
};



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


/*-----------------------------------------------------------------------
 * Manage TCL fallbacks
 */


static void transition_to_swtnl( GLcontext *ctx )
{
   radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   GLuint se_cntl;

   RADEON_NEWPRIM( rmesa );
   rmesa->swtcl.vertex_format = 0;

   radeonChooseVertexState( ctx );
   radeonChooseRenderState( ctx );

   _mesa_validate_all_lighting_tables( ctx ); 

   tnl->Driver.NotifyMaterialChange = 
      _mesa_validate_all_lighting_tables;

   radeonReleaseArrays( ctx, ~0 );

   se_cntl = rmesa->hw.set.cmd[SET_SE_CNTL];
   se_cntl |= RADEON_FLAT_SHADE_VTX_LAST;
	 
   if (se_cntl != rmesa->hw.set.cmd[SET_SE_CNTL]) {
      RADEON_STATECHANGE( rmesa, set );
      rmesa->hw.set.cmd[SET_SE_CNTL] = se_cntl;
   }
}


static void transition_to_hwtnl( GLcontext *ctx )
{
   radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   GLuint se_coord_fmt = rmesa->hw.set.cmd[SET_SE_COORDFMT];

   se_coord_fmt &= ~(RADEON_VTX_XY_PRE_MULT_1_OVER_W0 |
		     RADEON_VTX_Z_PRE_MULT_1_OVER_W0 |
		     RADEON_VTX_W0_IS_NOT_1_OVER_W0);
   se_coord_fmt |= RADEON_VTX_W0_IS_NOT_1_OVER_W0;

   if ( se_coord_fmt != rmesa->hw.set.cmd[SET_SE_COORDFMT] ) {
      RADEON_STATECHANGE( rmesa, set );
      rmesa->hw.set.cmd[SET_SE_COORDFMT] = se_coord_fmt;
      _tnl_need_projected_coords( ctx, GL_FALSE );
   }

   radeonUpdateMaterial( ctx );

   tnl->Driver.NotifyMaterialChange = radeonUpdateMaterial;

   if ( rmesa->dma.flush )			
      rmesa->dma.flush( rmesa );	

   rmesa->dma.flush = NULL;
   rmesa->swtcl.vertex_format = 0;
   
   if (rmesa->swtcl.indexed_verts.buf) 
      radeonReleaseDmaRegion( rmesa, &rmesa->swtcl.indexed_verts, 
			      __FUNCTION__ );

   if (RADEON_DEBUG & DEBUG_FALLBACKS) 
      fprintf(stderr, "Radeon end tcl fallback\n");
}

static char *fallbackStrings[] = {
   "Rasterization fallback",
   "Unfilled triangles",
   "Twosided lighting, differing materials",
   "Materials in VB (maybe between begin/end)",
   "Texgen unit 0",
   "Texgen unit 1",
   "Texgen unit 2",
   "User disable",
   "Fogcoord with separate specular lighting"
};


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



void radeonTclFallback( GLcontext *ctx, GLuint bit, GLboolean mode )
{
   radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
   GLuint oldfallback = rmesa->TclFallback;

   if (mode) {
      rmesa->TclFallback |= bit;
      if (oldfallback == 0) {
	 if (RADEON_DEBUG & DEBUG_FALLBACKS) 
	    fprintf(stderr, "Radeon begin tcl fallback %s\n",
		    getFallbackString( bit ));
	 transition_to_swtnl( ctx );
      }
   }
   else {
      rmesa->TclFallback &= ~bit;
      if (oldfallback == bit) {
	 if (RADEON_DEBUG & DEBUG_FALLBACKS) 
	    fprintf(stderr, "Radeon end tcl fallback %s\n",
		    getFallbackString( bit ));
	 transition_to_hwtnl( ctx );
      }
   }
}