s_context.c

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

         }
      }
   }
}



static void
_swrast_sleep( GLcontext *ctx, GLbitfield new_state )
{
   (void) ctx; (void) new_state;
}


static void
_swrast_invalidate_state( GLcontext *ctx, GLbitfield new_state )
{
   SWcontext *swrast = SWRAST_CONTEXT(ctx);
   GLuint i;

   swrast->NewState |= new_state;

   /* After 10 statechanges without any swrast functions being called,
    * put the module to sleep.
    */
   if (++swrast->StateChanges > 10) {
      swrast->InvalidateState = _swrast_sleep;
      swrast->NewState = ~0;
      new_state = ~0;
   }

   {
      const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
      if (fp && (fp->Base.Parameters->StateFlags & new_state)) {
         _mesa_load_state_parameters(ctx, fp->Base.Parameters);
      }
   }

   if (new_state & swrast->InvalidateTriangleMask)
      swrast->Triangle = _swrast_validate_triangle;

   if (new_state & swrast->InvalidateLineMask)
      swrast->Line = _swrast_validate_line;

   if (new_state & swrast->InvalidatePointMask)
      swrast->Point = _swrast_validate_point;

   if (new_state & _SWRAST_NEW_BLEND_FUNC)
      swrast->BlendFunc = _swrast_validate_blend_func;

   if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
      for (i = 0 ; i < ctx->Const.MaxTextureImageUnits ; i++)
	 swrast->TextureSample[i] = NULL;
}


void
_swrast_update_texture_samplers(GLcontext *ctx)
{
   SWcontext *swrast = SWRAST_CONTEXT(ctx);
   GLuint u;

   for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
      const struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
      /* Note: If tObj is NULL, the sample function will be a simple
       * function that just returns opaque black (0,0,0,1).
       */
      swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);
   }
}


/**
 * Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,
 * swrast->_ActiveAtttribMask.
 */
static void
_swrast_update_active_attribs(GLcontext *ctx)
{
   SWcontext *swrast = SWRAST_CONTEXT(ctx);
   GLuint attribsMask;

   /*
    * Compute _ActiveAttribsMask = which fragment attributes are needed.
    */
   if (ctx->FragmentProgram._Current) {
      /* fragment program/shader */
      attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;
      attribsMask &= ~FRAG_BIT_WPOS; /* WPOS is always handled specially */
   }
   else if (ctx->ATIFragmentShader._Enabled) {
      attribsMask = ~0;  /* XXX fix me */
   }
   else {
      /* fixed function */
      attribsMask = 0x0;

#if CHAN_TYPE == GL_FLOAT
      attribsMask |= FRAG_BIT_COL0;
#endif

      if (ctx->Fog.ColorSumEnabled ||
          (ctx->Light.Enabled &&
           ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
         attribsMask |= FRAG_BIT_COL1;
      }

      if (swrast->_FogEnabled)
         attribsMask |= FRAG_BIT_FOGC;

      attribsMask |= (ctx->Texture._EnabledUnits << FRAG_ATTRIB_TEX0);
   }

   swrast->_ActiveAttribMask = attribsMask;

   /* Update _ActiveAttribs[] list */
   {
      GLuint i, num = 0;
      for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
         if (attribsMask & (1 << i)) {
            swrast->_ActiveAttribs[num++] = i;
            /* how should this attribute be interpolated? */
            if (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1)
               swrast->_InterpMode[i] = ctx->Light.ShadeModel;
            else
               swrast->_InterpMode[i] = GL_SMOOTH;
         }
      }
      swrast->_NumActiveAttribs = num;
   }
}


void
_swrast_validate_derived( GLcontext *ctx )
{
   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   if (swrast->NewState) {
      if (swrast->NewState & _NEW_POLYGON)
	 _swrast_update_polygon( ctx );

      if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
	 _swrast_update_fog_hint( ctx );

      if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
	 _swrast_update_texture_env( ctx );

      if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
         _swrast_update_fog_state( ctx );

      if (swrast->NewState & (_NEW_MODELVIEW |
                              _NEW_PROJECTION |
                              _NEW_TEXTURE_MATRIX |
                              _NEW_FOG |
                              _NEW_LIGHT |
                              _NEW_LINE |
                              _NEW_TEXTURE |
                              _NEW_TRANSFORM |
                              _NEW_POINT |
                              _NEW_VIEWPORT |
                              _NEW_PROGRAM))
	 _swrast_update_fragment_program( ctx, swrast->NewState );

      if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {
         _swrast_update_texture_samplers( ctx );
         _swrast_validate_texture_images(ctx);
      }

      if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))
         _swrast_update_deferred_texture(ctx);

      if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 	 _swrast_update_rasterflags( ctx );

      if (swrast->NewState & (_NEW_DEPTH |
                              _NEW_FOG |
                              _NEW_LIGHT |
                              _NEW_PROGRAM |
                              _NEW_TEXTURE))
         _swrast_update_active_attribs(ctx);

      swrast->NewState = 0;
      swrast->StateChanges = 0;
      swrast->InvalidateState = _swrast_invalidate_state;
   }
}

#define SWRAST_DEBUG 0

/* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 */
void
_swrast_Quad( GLcontext *ctx,
	      const SWvertex *v0, const SWvertex *v1,
              const SWvertex *v2, const SWvertex *v3 )
{
   if (SWRAST_DEBUG) {
      _mesa_debug(ctx, "_swrast_Quad\n");
      _swrast_print_vertex( ctx, v0 );
      _swrast_print_vertex( ctx, v1 );
      _swrast_print_vertex( ctx, v2 );
      _swrast_print_vertex( ctx, v3 );
   }
   SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
   SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
}

void
_swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
                  const SWvertex *v1, const SWvertex *v2 )
{
   if (SWRAST_DEBUG) {
      _mesa_debug(ctx, "_swrast_Triangle\n");
      _swrast_print_vertex( ctx, v0 );
      _swrast_print_vertex( ctx, v1 );
      _swrast_print_vertex( ctx, v2 );
   }
   SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
}

void
_swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
{
   if (SWRAST_DEBUG) {
      _mesa_debug(ctx, "_swrast_Line\n");
      _swrast_print_vertex( ctx, v0 );
      _swrast_print_vertex( ctx, v1 );
   }
   SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
}

void
_swrast_Point( GLcontext *ctx, const SWvertex *v0 )
{
   if (SWRAST_DEBUG) {
      _mesa_debug(ctx, "_swrast_Point\n");
      _swrast_print_vertex( ctx, v0 );
   }
   SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
}

void
_swrast_InvalidateState( GLcontext *ctx, GLbitfield new_state )
{
   if (SWRAST_DEBUG) {
      _mesa_debug(ctx, "_swrast_InvalidateState\n");
   }
   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
}

void
_swrast_ResetLineStipple( GLcontext *ctx )
{
   if (SWRAST_DEBUG) {
      _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
   }
   SWRAST_CONTEXT(ctx)->StippleCounter = 0;
}

void
_swrast_SetFacing(GLcontext *ctx, GLuint facing)
{
   SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
}

void
_swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
{
   if (SWRAST_DEBUG) {
      _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
   }
   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
   SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
}

void
_swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
{
   if (SWRAST_DEBUG) {
      _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
   }
   SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
   SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
}


GLboolean
_swrast_CreateContext( GLcontext *ctx )
{
   GLuint i;
   SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));

   if (SWRAST_DEBUG) {
      _mesa_debug(ctx, "_swrast_CreateContext\n");
   }

   if (!swrast)
      return GL_FALSE;

   swrast->NewState = ~0;

   swrast->choose_point = _swrast_choose_point;
   swrast->choose_line = _swrast_choose_line;
   swrast->choose_triangle = _swrast_choose_triangle;

   swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
   swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
   swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;

   swrast->Point = _swrast_validate_point;
   swrast->Line = _swrast_validate_line;
   swrast->Triangle = _swrast_validate_triangle;
   swrast->InvalidateState = _swrast_sleep;
   swrast->BlendFunc = _swrast_validate_blend_func;

   swrast->AllowVertexFog = GL_TRUE;
   swrast->AllowPixelFog = GL_TRUE;

   /* Optimized Accum buffer */
   swrast->_IntegerAccumMode = GL_FALSE;
   swrast->_IntegerAccumScaler = 0.0;

   for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
      swrast->TextureSample[i] = NULL;

   swrast->SpanArrays = MALLOC_STRUCT(sw_span_arrays);
   if (!swrast->SpanArrays) {
      FREE(swrast);
      return GL_FALSE;
   }
   swrast->SpanArrays->ChanType = CHAN_TYPE;
#if CHAN_TYPE == GL_UNSIGNED_BYTE
   swrast->SpanArrays->rgba = swrast->SpanArrays->rgba8;
#elif CHAN_TYPE == GL_UNSIGNED_SHORT
   swrast->SpanArrays->rgba = swrast->SpanArrays->rgba16;
#else
   swrast->SpanArrays->rgba = swrast->SpanArrays->attribs[FRAG_ATTRIB_COL0];
#endif

   /* init point span buffer */
   swrast->PointSpan.primitive = GL_POINT;
   swrast->PointSpan.end = 0;
   swrast->PointSpan.facing = 0;
   swrast->PointSpan.array = swrast->SpanArrays;

   swrast->TexelBuffer = (GLchan *) MALLOC(ctx->Const.MaxTextureImageUnits *
                                           MAX_WIDTH * 4 * sizeof(GLchan));
   if (!swrast->TexelBuffer) {
      FREE(swrast->SpanArrays);
      FREE(swrast);
      return GL_FALSE;
   }

   ctx->swrast_context = swrast;

   return GL_TRUE;
}

void
_swrast_DestroyContext( GLcontext *ctx )
{
   SWcontext *swrast = SWRAST_CONTEXT(ctx);

   if (SWRAST_DEBUG) {
      _mesa_debug(ctx, "_swrast_DestroyContext\n");
   }

   FREE( swrast->SpanArrays );
   if (swrast->ZoomedArrays)
      FREE( swrast->ZoomedArrays );
   FREE( swrast->TexelBuffer );
   FREE( swrast );

   ctx->swrast_context = 0;
}


struct swrast_device_driver *
_swrast_GetDeviceDriverReference( GLcontext *ctx )
{
   SWcontext *swrast = SWRAST_CONTEXT(ctx);
   return &swrast->Driver;
}

void
_swrast_flush( GLcontext *ctx )
{
   SWcontext *swrast = SWRAST_CONTEXT(ctx);
   /* flush any pending fragments from rendering points */
   if (swrast->PointSpan.end > 0) {
      if (ctx->Visual.rgbMode) {
         _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
      }
      else {
         _swrast_write_index_span(ctx, &(swrast->PointSpan));
      }
      swrast->PointSpan.end = 0;
   }
}

void
_swrast_render_primitive( GLcontext *ctx, GLenum prim )
{
   SWcontext *swrast = SWRAST_CONTEXT(ctx);
   if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
      _swrast_flush(ctx);
   }
   swrast->Primitive = prim;
}


void
_swrast_render_start( GLcontext *ctx )
{
   SWcontext *swrast = SWRAST_CONTEXT(ctx);
   if (swrast->Driver.SpanRenderStart)
      swrast->Driver.SpanRenderStart( ctx );
   swrast->PointSpan.end = 0;
}
 
void
_swrast_render_finish( GLcontext *ctx )
{
   SWcontext *swrast = SWRAST_CONTEXT(ctx);
   if (swrast->Driver.SpanRenderFinish)
      swrast->Driver.SpanRenderFinish( ctx );

   _swrast_flush(ctx);
}


#define SWRAST_DEBUG_VERTICES 0

void
_swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
{
   GLuint i;

   if (SWRAST_DEBUG_VERTICES) {
      _mesa_debug(ctx, "win %f %f %f %f\n",
                  v->attrib[FRAG_ATTRIB_WPOS][0],
                  v->attrib[FRAG_ATTRIB_WPOS][1],
                  v->attrib[FRAG_ATTRIB_WPOS][2],
                  v->attrib[FRAG_ATTRIB_WPOS][3]);

      for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
	 if (ctx->Texture.Unit[i]._ReallyEnabled)
	    _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
                        v->attrib[FRAG_ATTRIB_TEX0 + i][0],
                        v->attrib[FRAG_ATTRIB_TEX0 + i][1],
                        v->attrib[FRAG_ATTRIB_TEX0 + i][2],
                        v->attrib[FRAG_ATTRIB_TEX0 + i][3]);

#if CHAN_TYPE == GL_FLOAT
      _mesa_debug(ctx, "color %f %f %f %f\n",
                  v->color[0], v->color[1], v->color[2], v->color[3]);
#else
      _mesa_debug(ctx, "color %d %d %d %d\n",
                  v->color[0], v->color[1], v->color[2], v->color[3]);
#endif
      _mesa_debug(ctx, "spec %g %g %g %g\n",
                  v->attrib[FRAG_ATTRIB_COL1][0],
                  v->attrib[FRAG_ATTRIB_COL1][1],
                  v->attrib[FRAG_ATTRIB_COL1][2],
                  v->attrib[FRAG_ATTRIB_COL1][3]);
      _mesa_debug(ctx, "fog %f\n", v->attrib[FRAG_ATTRIB_FOGC][0]);
      _mesa_debug(ctx, "index %d\n", v->attrib[FRAG_ATTRIB_CI][0]);
      _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
      _mesa_debug(ctx, "\n");
   }
}