radeon_lighting.c

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

      break;

   case GL_POSITION: {
      /* positions picked up in update_light, but can do flag here */	
      GLuint flag = (p&1)? RADEON_LIGHT_1_IS_LOCAL : RADEON_LIGHT_0_IS_LOCAL;
      GLuint idx = TCL_PER_LIGHT_CTL_0 + p/2;

      RADEON_STATECHANGE(rmesa, tcl);
      if (l->EyePosition[3] != 0.0F)
	 rmesa->hw.tcl.cmd[idx] |= flag;
      else
	 rmesa->hw.tcl.cmd[idx] &= ~flag;
      break;
   }

   case GL_SPOT_EXPONENT:
      RADEON_STATECHANGE(rmesa, lit[p]);
      fcmd[LIT_SPOT_EXPONENT] = params[0];
      break;

   case GL_SPOT_CUTOFF: {
      GLuint flag = (p&1) ? RADEON_LIGHT_1_IS_SPOT : RADEON_LIGHT_0_IS_SPOT;
      GLuint idx = TCL_PER_LIGHT_CTL_0 + p/2;

      RADEON_STATECHANGE(rmesa, lit[p]);
      fcmd[LIT_SPOT_CUTOFF] = l->_CosCutoff;

      RADEON_STATECHANGE(rmesa, tcl);
      if (l->SpotCutoff != 180.0F)
	 rmesa->hw.tcl.cmd[idx] |= flag;
      else
	 rmesa->hw.tcl.cmd[idx] &= ~flag;
      break;
   }

   case GL_CONSTANT_ATTENUATION:
      RADEON_STATECHANGE(rmesa, lit[p]);
      fcmd[LIT_ATTEN_CONST] = params[0];
      break;
   case GL_LINEAR_ATTENUATION:
      RADEON_STATECHANGE(rmesa, lit[p]);
      fcmd[LIT_ATTEN_LINEAR] = params[0];
      break;
   case GL_QUADRATIC_ATTENUATION:
      RADEON_STATECHANGE(rmesa, lit[p]);
      fcmd[LIT_ATTEN_QUADRATIC] = params[0];
      break;
   default:
      return;
   }

}

		  


void radeonLightModelfv( GLcontext *ctx, GLenum pname,
			 const GLfloat *param )
{
   radeonContextPtr rmesa = RADEON_CONTEXT(ctx);

   switch (pname) {
      case GL_LIGHT_MODEL_AMBIENT: 
	 update_global_ambient( ctx );
	 break;

      case GL_LIGHT_MODEL_LOCAL_VIEWER:
	 RADEON_STATECHANGE( rmesa, tcl );
	 if (ctx->Light.Model.LocalViewer)
	    rmesa->hw.tcl.cmd[TCL_LIGHT_MODEL_CTL] |= RADEON_LOCAL_VIEWER;
	 else
	    rmesa->hw.tcl.cmd[TCL_LIGHT_MODEL_CTL] &= ~RADEON_LOCAL_VIEWER;
         break;

      case GL_LIGHT_MODEL_TWO_SIDE:
	 RADEON_STATECHANGE( rmesa, tcl );
	 if (ctx->Light.Model.TwoSide)
	    rmesa->hw.tcl.cmd[TCL_UCP_VERT_BLEND_CTL] |= RADEON_LIGHT_TWOSIDE;
	 else
	    rmesa->hw.tcl.cmd[TCL_UCP_VERT_BLEND_CTL] &= ~RADEON_LIGHT_TWOSIDE;

	 check_twoside_fallback( ctx );

#if _HAVE_SWTNL
	 if (rmesa->TclFallback) {
	    radeonChooseRenderState( ctx );
	    radeonChooseVertexState( ctx );
	 }
#endif
         break;

      case GL_LIGHT_MODEL_COLOR_CONTROL:
	 radeonUpdateSpecular(ctx);

	 RADEON_STATECHANGE( rmesa, tcl );
	 if (ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR) 
	    rmesa->hw.tcl.cmd[TCL_LIGHT_MODEL_CTL] &= 
	       ~RADEON_DIFFUSE_SPECULAR_COMBINE;
	 else
	    rmesa->hw.tcl.cmd[TCL_LIGHT_MODEL_CTL] |= 
	       RADEON_DIFFUSE_SPECULAR_COMBINE;
         break;

      default:
         break;
   }
}


/* =============================================================
 * Fog
 */


static void radeonFogfv( GLcontext *ctx, GLenum pname, const GLfloat *param )
{
   radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
   union { int i; float f; } c, d;
   GLchan col[4];

   c.i = rmesa->hw.fog.cmd[FOG_C];
   d.i = rmesa->hw.fog.cmd[FOG_D];

   switch (pname) {
   case GL_FOG_MODE:
      if (!ctx->Fog.Enabled)
	 return;
      RADEON_STATECHANGE(rmesa, tcl);
      rmesa->hw.tcl.cmd[TCL_UCP_VERT_BLEND_CTL] &= ~RADEON_TCL_FOG_MASK;
      switch (ctx->Fog.Mode) {
      case GL_LINEAR:
	 rmesa->hw.tcl.cmd[TCL_UCP_VERT_BLEND_CTL] |= RADEON_TCL_FOG_LINEAR;
	 if (ctx->Fog.Start == ctx->Fog.End) {
	    c.f = 1.0F;
	    d.f = 1.0F;
	 }
	 else {
	    c.f = ctx->Fog.End/(ctx->Fog.End-ctx->Fog.Start);
	    d.f = 1.0/(ctx->Fog.End-ctx->Fog.Start);
	 }
	 break;
      case GL_EXP:
	 rmesa->hw.tcl.cmd[TCL_UCP_VERT_BLEND_CTL] |= RADEON_TCL_FOG_EXP;
	 c.f = 0.0;
	 d.f = ctx->Fog.Density;
	 break;
      case GL_EXP2:
	 rmesa->hw.tcl.cmd[TCL_UCP_VERT_BLEND_CTL] |= RADEON_TCL_FOG_EXP2;
	 c.f = 0.0;
	 d.f = -(ctx->Fog.Density * ctx->Fog.Density);
	 break;
      default:
	 return;
      }
      break;
   case GL_FOG_DENSITY:
      switch (ctx->Fog.Mode) {
      case GL_EXP:
	 c.f = 0.0;
	 d.f = ctx->Fog.Density;
	 break;
      case GL_EXP2:
	 c.f = 0.0;
	 d.f = -(ctx->Fog.Density * ctx->Fog.Density);
	 break;
      default:
	 break;
      }
      break;
   case GL_FOG_START:
   case GL_FOG_END:
      if (ctx->Fog.Mode == GL_LINEAR) {
	 if (ctx->Fog.Start == ctx->Fog.End) {
	    c.f = 1.0F;
	    d.f = 1.0F;
	 } else {
	    c.f = ctx->Fog.End/(ctx->Fog.End-ctx->Fog.Start);
	    d.f = 1.0/(ctx->Fog.End-ctx->Fog.Start);
	 }
      }
      break;
   case GL_FOG_COLOR: 
      RADEON_STATECHANGE( rmesa, ctx );
      UNCLAMPED_FLOAT_TO_RGB_CHAN( col, ctx->Fog.Color );
      rmesa->hw.ctx.cmd[CTX_PP_FOG_COLOR] =
	 radeonPackColor( 4, col[0], col[1], col[2], 0 );
      break;
   case GL_FOG_COORDINATE_SOURCE_EXT: 
      /* What to do?
       */
      break;
   default:
      return;
   }

   if (c.i != rmesa->hw.fog.cmd[FOG_C] || d.i != rmesa->hw.fog.cmd[FOG_D]) {
      RADEON_STATECHANGE( rmesa, fog );
      rmesa->hw.fog.cmd[FOG_C] = c.i;
      rmesa->hw.fog.cmd[FOG_D] = d.i;
   }
}

/* Examine lighting and texture state to determine if separate specular
 * should be enabled.
 */
void radeonUpdateSpecular( GLcontext *ctx )
{
   radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
   GLuint p = rmesa->hw.ctx.cmd[CTX_PP_CNTL];

   if (NEED_SECONDARY_COLOR(ctx)) {
      p |=  RADEON_SPECULAR_ENABLE;
   } else {
      p &= ~RADEON_SPECULAR_ENABLE;
   }

   if ( rmesa->hw.ctx.cmd[CTX_PP_CNTL] != p ) {
      RADEON_STATECHANGE( rmesa, ctx );
      rmesa->hw.ctx.cmd[CTX_PP_CNTL] = p;
   }

   /* Bizzare: have to leave lighting enabled to get fog.
    */
   RADEON_STATECHANGE( rmesa, tcl );
   if ((ctx->Light.Enabled &&
	ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
      rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXSEL] |= RADEON_TCL_COMPUTE_SPECULAR;
      rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXSEL] |= RADEON_TCL_COMPUTE_DIFFUSE;
      rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXFMT] |= RADEON_TCL_VTX_PK_SPEC;
      rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXFMT] |= RADEON_TCL_VTX_PK_DIFFUSE;
      rmesa->hw.tcl.cmd[TCL_LIGHT_MODEL_CTL] |= RADEON_LIGHTING_ENABLE;
   }
   else if (ctx->Fog.Enabled) {
      if (ctx->Light.Enabled) {
	 rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXSEL] |= RADEON_TCL_COMPUTE_SPECULAR;
	 rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXSEL] |= RADEON_TCL_COMPUTE_DIFFUSE;
	 rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXFMT] |= RADEON_TCL_VTX_PK_SPEC;
	 rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXFMT] |= RADEON_TCL_VTX_PK_DIFFUSE;
	 rmesa->hw.tcl.cmd[TCL_LIGHT_MODEL_CTL] |= RADEON_LIGHTING_ENABLE;
      } else {
	 rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXSEL] |= RADEON_TCL_COMPUTE_SPECULAR;
	 rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXSEL] &= ~RADEON_TCL_COMPUTE_DIFFUSE;
	 rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXFMT] |= RADEON_TCL_VTX_PK_SPEC;
	 rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXFMT] |= RADEON_TCL_VTX_PK_DIFFUSE;
	 rmesa->hw.tcl.cmd[TCL_LIGHT_MODEL_CTL] |= RADEON_LIGHTING_ENABLE;
      }
   }
   else if (ctx->Light.Enabled) {
      rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXSEL] &= ~RADEON_TCL_COMPUTE_SPECULAR;
      rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXSEL] |= RADEON_TCL_COMPUTE_DIFFUSE;
      rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXFMT] &= ~RADEON_TCL_VTX_PK_SPEC;
      rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXFMT] |= RADEON_TCL_VTX_PK_DIFFUSE;
      rmesa->hw.tcl.cmd[TCL_LIGHT_MODEL_CTL] |= RADEON_LIGHTING_ENABLE;
   } else if (ctx->Fog.ColorSumEnabled ) {
      rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXSEL] &= ~RADEON_TCL_COMPUTE_SPECULAR;
      rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXSEL] &= ~RADEON_TCL_COMPUTE_DIFFUSE;
      rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXFMT] |= RADEON_TCL_VTX_PK_SPEC;
      rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXFMT] |= RADEON_TCL_VTX_PK_DIFFUSE;
      rmesa->hw.tcl.cmd[TCL_LIGHT_MODEL_CTL] &= ~RADEON_LIGHTING_ENABLE;
   } else {
      rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXSEL] &= ~RADEON_TCL_COMPUTE_SPECULAR;
      rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXSEL] &= ~RADEON_TCL_COMPUTE_DIFFUSE;
      rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXFMT] &= ~RADEON_TCL_VTX_PK_SPEC;
      rmesa->hw.tcl.cmd[TCL_OUTPUT_VTXFMT] |= RADEON_TCL_VTX_PK_DIFFUSE;
      rmesa->hw.tcl.cmd[TCL_LIGHT_MODEL_CTL] &= ~RADEON_LIGHTING_ENABLE;
   }

#if _HAVE_SWTNL
   /* Update vertex/render formats
    */
   if (rmesa->TclFallback) { 
      radeonChooseRenderState( ctx );
      radeonChooseVertexState( ctx );
   }
#endif
}



static void radeonLightingSpaceChange( GLcontext *ctx )
{
   radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
   GLboolean tmp;
   RADEON_STATECHANGE( rmesa, tcl );

   if (RADEON_DEBUG & DEBUG_STATE)
      fprintf(stderr, "%s %d\n", __FUNCTION__, ctx->_NeedEyeCoords);

   if (ctx->_NeedEyeCoords)
      tmp = ctx->Transform.RescaleNormals;
   else
      tmp = !ctx->Transform.RescaleNormals;

   if ( tmp ) {
      rmesa->hw.tcl.cmd[TCL_LIGHT_MODEL_CTL] |=  RADEON_RESCALE_NORMALS;
   } else {
      rmesa->hw.tcl.cmd[TCL_LIGHT_MODEL_CTL] &= ~RADEON_RESCALE_NORMALS;
   }
}

void radeonInitLightStateFuncs( GLcontext *ctx )
{
   radeonContextPtr rmesa = RADEON_CONTEXT(ctx);
   int i;

   ctx->Driver.LightModelfv		= radeonLightModelfv; 
   ctx->Driver.Lightfv			= radeonLightfv; 
   ctx->Driver.Fogfv			= radeonFogfv;
   ctx->Driver.LightingSpaceChange      = radeonLightingSpaceChange;

   for (i = 0 ; i < 8; i++) {
      struct gl_light *l = &ctx->Light.Light[i];
      GLenum p = GL_LIGHT0 + i;
      *(float *)&(rmesa->hw.lit[i].cmd[LIT_RANGE_CUTOFF]) = FLT_MAX;

      ctx->Driver.Lightfv( ctx, p, GL_AMBIENT, l->Ambient );
      ctx->Driver.Lightfv( ctx, p, GL_DIFFUSE, l->Diffuse );
      ctx->Driver.Lightfv( ctx, p, GL_SPECULAR, l->Specular );
      ctx->Driver.Lightfv( ctx, p, GL_POSITION, 0 );
      ctx->Driver.Lightfv( ctx, p, GL_SPOT_DIRECTION, 0 );
      ctx->Driver.Lightfv( ctx, p, GL_SPOT_EXPONENT, &l->SpotExponent );
      ctx->Driver.Lightfv( ctx, p, GL_SPOT_CUTOFF, &l->SpotCutoff );
      ctx->Driver.Lightfv( ctx, p, GL_CONSTANT_ATTENUATION,
			   &l->ConstantAttenuation );
      ctx->Driver.Lightfv( ctx, p, GL_LINEAR_ATTENUATION, 
			   &l->LinearAttenuation );
      ctx->Driver.Lightfv( ctx, p, GL_QUADRATIC_ATTENUATION, 
		     &l->QuadraticAttenuation );
   }

   ctx->Driver.LightModelfv( ctx, GL_LIGHT_MODEL_AMBIENT, 
			     ctx->Light.Model.Ambient );

   ctx->Driver.Fogfv( ctx, GL_FOG_MODE, 0 );
   ctx->Driver.Fogfv( ctx, GL_FOG_DENSITY, &ctx->Fog.Density );
   ctx->Driver.Fogfv( ctx, GL_FOG_START, &ctx->Fog.Start );
   ctx->Driver.Fogfv( ctx, GL_FOG_END, &ctx->Fog.End );
   ctx->Driver.Fogfv( ctx, GL_FOG_COLOR, ctx->Fog.Color );
   ctx->Driver.Fogfv( ctx, GL_FOG_COORDINATE_SOURCE_EXT, 0 );
}