fxsetup.c

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

static GrStencil_t convertGLStencilOp( GLenum op )
{
   switch ( op ) {
   case GL_KEEP:
      return GR_STENCILOP_KEEP;
   case GL_ZERO:
      return GR_STENCILOP_ZERO;
   case GL_REPLACE:
      return GR_STENCILOP_REPLACE;
   case GL_INCR:
      return GR_STENCILOP_INCR_CLAMP;
   case GL_DECR:
      return GR_STENCILOP_DECR_CLAMP;
   case GL_INVERT:
      return GR_STENCILOP_INVERT;
   case GL_INCR_WRAP_EXT:
      return GR_STENCILOP_INCR_WRAP;
   case GL_DECR_WRAP_EXT:
      return GR_STENCILOP_DECR_WRAP;
   default:
      _mesa_problem( NULL, "bad stencil op in convertGLStencilOp" );
   }
   return GR_STENCILOP_KEEP;   /* never get, silence compiler warning */
}

void
fxDDStencilFuncSeparate (GLcontext *ctx, GLenum face, GLenum func,
                         GLint ref, GLuint mask)
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   tfxUnitsState *us = &fxMesa->unitsState;

   if (ctx->Stencil.ActiveFace) {
      return;
   }

   if (
       (us->stencilFunction != func)
       ||
       (us->stencilRefValue != ref)
       ||
       (us->stencilValueMask != mask)
      ) {
      us->stencilFunction = func;
      us->stencilRefValue = ref;
      us->stencilValueMask = mask;
      fxMesa->new_state |= FX_NEW_STENCIL;
   }
}

void
fxDDStencilMaskSeparate (GLcontext *ctx, GLenum face, GLuint mask)
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   tfxUnitsState *us = &fxMesa->unitsState;

   if (ctx->Stencil.ActiveFace) {
      return;
   }

   if (us->stencilWriteMask != mask) {
      us->stencilWriteMask = mask;
      fxMesa->new_state |= FX_NEW_STENCIL;
   }
}

void
fxDDStencilOpSeparate (GLcontext *ctx, GLenum face, GLenum sfail,
                       GLenum zfail, GLenum zpass)
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   tfxUnitsState *us = &fxMesa->unitsState;

   if (ctx->Stencil.ActiveFace) {
      return;
   }

   if (
       (us->stencilFailFunc != sfail)
       ||
       (us->stencilZFailFunc != zfail)
       ||
       (us->stencilZPassFunc != zpass)
      ) {
      us->stencilFailFunc = sfail;
      us->stencilZFailFunc = zfail;
      us->stencilZPassFunc = zpass;
      fxMesa->new_state |= FX_NEW_STENCIL;
   }
}

void
fxSetupStencil (GLcontext * ctx)
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   tfxUnitsState *us = &fxMesa->unitsState;

   if (us->stencilEnabled) {
      GrCmpFnc_t stencilFailFunc = GR_STENCILOP_KEEP;
      GrCmpFnc_t stencilZFailFunc = GR_STENCILOP_KEEP;
      GrCmpFnc_t stencilZPassFunc = GR_STENCILOP_KEEP;
      if (!fxMesa->multipass) {
         stencilFailFunc = convertGLStencilOp(us->stencilFailFunc);
         stencilZFailFunc = convertGLStencilOp(us->stencilZFailFunc);
         stencilZPassFunc = convertGLStencilOp(us->stencilZPassFunc);
      }
      grEnable(GR_STENCIL_MODE_EXT);
      fxMesa->Glide.grStencilOpExt(stencilFailFunc,
                                   stencilZFailFunc,
                                   stencilZPassFunc);
      fxMesa->Glide.grStencilFuncExt(us->stencilFunction - GL_NEVER + GR_CMP_NEVER,
                                     us->stencilRefValue,
                                     us->stencilValueMask);
      fxMesa->Glide.grStencilMaskExt(us->stencilWriteMask);
   } else {
      grDisable(GR_STENCIL_MODE_EXT);
   }
}

void
fxSetupStencilFace (GLcontext * ctx, GLint face)
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   tfxUnitsState *us = &fxMesa->unitsState;

   if (us->stencilEnabled) {
      GrCmpFnc_t stencilFailFunc = GR_STENCILOP_KEEP;
      GrCmpFnc_t stencilZFailFunc = GR_STENCILOP_KEEP;
      GrCmpFnc_t stencilZPassFunc = GR_STENCILOP_KEEP;
      if (!fxMesa->multipass) {
         stencilFailFunc = convertGLStencilOp(ctx->Stencil.FailFunc[face]);
         stencilZFailFunc = convertGLStencilOp(ctx->Stencil.ZFailFunc[face]);
         stencilZPassFunc = convertGLStencilOp(ctx->Stencil.ZPassFunc[face]);
      }
      grEnable(GR_STENCIL_MODE_EXT);
      fxMesa->Glide.grStencilOpExt(stencilFailFunc,
                                   stencilZFailFunc,
                                   stencilZPassFunc);
      fxMesa->Glide.grStencilFuncExt(ctx->Stencil.Function[face] - GL_NEVER + GR_CMP_NEVER,
                                     ctx->Stencil.Ref[face],
                                     ctx->Stencil.ValueMask[face]);
      fxMesa->Glide.grStencilMaskExt(ctx->Stencil.WriteMask[face]);
   } else {
      grDisable(GR_STENCIL_MODE_EXT);
   }
}

/************************************************************************/
/**************************** Color Mask SetUp **************************/
/************************************************************************/

void
fxDDColorMask(GLcontext * ctx,
	      GLboolean r, GLboolean g, GLboolean b, GLboolean a)
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   fxMesa->new_state |= FX_NEW_COLOR_MASK;
   (void) r;
   (void) g;
   (void) b;
   (void) a;
}

void
fxSetupColorMask(GLcontext * ctx)
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);

   if (fxMesa->colDepth == 32) {
      /* 32bpp mode */
      fxMesa->Glide.grColorMaskExt(ctx->Color.ColorMask[RCOMP],
                                   ctx->Color.ColorMask[GCOMP],
                                   ctx->Color.ColorMask[BCOMP],
                                   ctx->Color.ColorMask[ACOMP] && fxMesa->haveHwAlpha);
   }
   else {
      /* 15/16 bpp mode */
      grColorMask(ctx->Color.ColorMask[RCOMP] |
                  ctx->Color.ColorMask[GCOMP] |
                  ctx->Color.ColorMask[BCOMP],
                  ctx->Color.ColorMask[ACOMP] && fxMesa->haveHwAlpha);
   }
}




/************************************************************************/
/**************************** Fog Mode SetUp ****************************/
/************************************************************************/

/*
 * This is called during state update in order to update the Glide fog state.
 */
static void
fxSetupFog(GLcontext * ctx)
{
   if (ctx->Fog.Enabled /*&& ctx->FogMode==FOG_FRAGMENT */ ) {
      fxMesaContext fxMesa = FX_CONTEXT(ctx);

      /* update fog color */
      GLubyte col[4];
      col[0] = (unsigned int) (255 * ctx->Fog.Color[0]);
      col[1] = (unsigned int) (255 * ctx->Fog.Color[1]);
      col[2] = (unsigned int) (255 * ctx->Fog.Color[2]);
      col[3] = (unsigned int) (255 * ctx->Fog.Color[3]);
      grFogColorValue(FXCOLOR4(col));

      if (fxMesa->fogTableMode != ctx->Fog.Mode ||
	  fxMesa->fogDensity != ctx->Fog.Density ||
	  fxMesa->fogStart != ctx->Fog.Start ||
	  fxMesa->fogEnd != ctx->Fog.End) {
	 /* reload the fog table */
	 switch (ctx->Fog.Mode) {
	 case GL_LINEAR:
	    guFogGenerateLinear(fxMesa->fogTable, ctx->Fog.Start,
				ctx->Fog.End);
	    if (fxMesa->fogTable[0] > 63) {
	       /* [dBorca] Hack alert:
	        * As per Glide3 Programming Guide:
	        * The difference between consecutive fog values
	        * must be less than 64.
	        */
	       fxMesa->fogTable[0] = 63;
	    }
	    break;
	 case GL_EXP:
	    guFogGenerateExp(fxMesa->fogTable, ctx->Fog.Density);
	    break;
	 case GL_EXP2:
	    guFogGenerateExp2(fxMesa->fogTable, ctx->Fog.Density);
	    break;
	 default:
	    ;
	 }
	 fxMesa->fogTableMode = ctx->Fog.Mode;
	 fxMesa->fogDensity = ctx->Fog.Density;
	 fxMesa->fogStart = ctx->Fog.Start;
	 fxMesa->fogEnd = ctx->Fog.End;
      }

      grFogTable(fxMesa->fogTable);
      if (ctx->Fog.FogCoordinateSource == GL_FOG_COORDINATE_EXT) {
         grVertexLayout(GR_PARAM_FOG_EXT, GR_VERTEX_FOG_OFFSET << 2,
                                          GR_PARAM_ENABLE);
         grFogMode(GR_FOG_WITH_TABLE_ON_FOGCOORD_EXT);
      } else {
         grVertexLayout(GR_PARAM_FOG_EXT, GR_VERTEX_FOG_OFFSET << 2,
                                          GR_PARAM_DISABLE);
         grFogMode(GR_FOG_WITH_TABLE_ON_Q);
      }
   }
   else {
      grFogMode(GR_FOG_DISABLE);
   }
}

void
fxDDFogfv(GLcontext * ctx, GLenum pname, const GLfloat * params)
{
   FX_CONTEXT(ctx)->new_state |= FX_NEW_FOG;
   switch (pname) {
      case GL_FOG_COORDINATE_SOURCE_EXT: {
         GLenum p = (GLenum)*params;
         if (p == GL_FOG_COORDINATE_EXT) {
            _swrast_allow_vertex_fog(ctx, GL_TRUE);
            _swrast_allow_pixel_fog(ctx, GL_FALSE);
            _tnl_allow_vertex_fog( ctx, GL_TRUE);
            _tnl_allow_pixel_fog( ctx, GL_FALSE);
         } else {
            _swrast_allow_vertex_fog(ctx, GL_FALSE);
            _swrast_allow_pixel_fog(ctx, GL_TRUE);
            _tnl_allow_vertex_fog( ctx, GL_FALSE);
            _tnl_allow_pixel_fog( ctx, GL_TRUE);
         }
         break;
      }
      default:
         ;
   }
}

/************************************************************************/
/************************** Scissor Test SetUp **************************/
/************************************************************************/

/* This routine is used in managing the lock state, and therefore can't lock */
void
fxSetScissorValues(GLcontext * ctx)
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   int xmin, xmax;
   int ymin, ymax;

   if (ctx->Scissor.Enabled) {
      xmin = ctx->Scissor.X;
      xmax = ctx->Scissor.X + ctx->Scissor.Width;
      ymin = ctx->Scissor.Y;
      ymax = ctx->Scissor.Y + ctx->Scissor.Height;

      if (xmin < 0)
         xmin = 0;
      if (xmax > fxMesa->width)
         xmax = fxMesa->width;
      if (ymin < fxMesa->screen_height - fxMesa->height)
         ymin = fxMesa->screen_height - fxMesa->height;
      if (ymax > fxMesa->screen_height - 0)
         ymax = fxMesa->screen_height - 0;
   }
   else {
      xmin = 0;
      ymin = 0;
      xmax = fxMesa->width;
      ymax = fxMesa->height;
   }

   fxMesa->clipMinX = xmin;
   fxMesa->clipMinY = ymin;
   fxMesa->clipMaxX = xmax;
   fxMesa->clipMaxY = ymax;
   grClipWindow(xmin, ymin, xmax, ymax);
}

void
fxSetupScissor(GLcontext * ctx)
{
   BEGIN_BOARD_LOCK();
   fxSetScissorValues(ctx);
   END_BOARD_LOCK();
}

void
fxDDScissor(GLcontext * ctx, GLint x, GLint y, GLsizei w, GLsizei h)
{
   FX_CONTEXT(ctx)->new_state |= FX_NEW_SCISSOR;
}

/************************************************************************/
/*************************** Cull mode setup ****************************/
/************************************************************************/


void
fxDDCullFace(GLcontext * ctx, GLenum mode)
{
   (void) mode;
   FX_CONTEXT(ctx)->new_state |= FX_NEW_CULL;
}

void
fxDDFrontFace(GLcontext * ctx, GLenum mode)
{
   (void) mode;
   FX_CONTEXT(ctx)->new_state |= FX_NEW_CULL;
}


void
fxSetupCull(GLcontext * ctx)
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   GrCullMode_t mode = GR_CULL_DISABLE;

   if (ctx->Polygon.CullFlag && (fxMesa->raster_primitive == GL_TRIANGLES)) {
      switch (ctx->Polygon.CullFaceMode) {
      case GL_BACK:
	 if (ctx->Polygon.FrontFace == GL_CCW)
	    mode = GR_CULL_NEGATIVE;
	 else
	    mode = GR_CULL_POSITIVE;
	 break;
      case GL_FRONT:
	 if (ctx->Polygon.FrontFace == GL_CCW)
	    mode = GR_CULL_POSITIVE;
	 else
	    mode = GR_CULL_NEGATIVE;
	 break;
      case GL_FRONT_AND_BACK:
	 /* Handled as a fallback on triangles in tdfx_tris.c */
	 return;
      default:
	 ASSERT(0);
	 break;
      }
   }

   if (fxMesa->cullMode != mode) {
      fxMesa->cullMode = mode;
      grCullMode(mode);
   }
}


/************************************************************************/
/****************************** DD Enable ******************************/
/************************************************************************/

void
fxDDEnable(GLcontext * ctx, GLenum cap, GLboolean state)
{
   fxMesaContext fxMesa = FX_CONTEXT(ctx);
   tfxUnitsState *us = &fxMesa->unitsState;

   if (TDFX_DEBUG & VERBOSE_DRIVER) {
      fprintf(stderr, "%s(%s)\n", state ? "fxDDEnable" : "fxDDDisable",
	      _mesa_lookup_enum_by_nr(cap));
   }

   switch (cap) {
   case GL_ALPHA_TEST:
      if (state != us->alphaTestEnabled) {
	 us->alphaTestEnabled = state;
	 fxMesa->new_state |= FX_NEW_ALPHA;