mgatex.c

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

      /* FIXME: This will report incorrect component sizes... */
      return MGA_IS_G400(mmesa) ? &_mesa_texformat_i8 : &_mesa_texformat_argb4444;

   case GL_YCBCR_MESA:
      if (MGA_IS_G400(mmesa) &&
          (type == GL_UNSIGNED_SHORT_8_8_APPLE ||
           type == GL_UNSIGNED_BYTE))
         return &_mesa_texformat_ycbcr;
      else
         return &_mesa_texformat_ycbcr_rev;

   case GL_COLOR_INDEX:
   case GL_COLOR_INDEX1_EXT:
   case GL_COLOR_INDEX2_EXT:
   case GL_COLOR_INDEX4_EXT:
   case GL_COLOR_INDEX8_EXT:
   case GL_COLOR_INDEX12_EXT:
   case GL_COLOR_INDEX16_EXT:
      return &_mesa_texformat_ci8;

   default:
      _mesa_problem( ctx, "unexpected texture format in %s", __FUNCTION__ );
      return NULL;
   }

   return NULL; /* never get here */
}




/**
 * Allocate space for and load the mesa images into the texture memory block.
 * This will happen before drawing with a new texture, or drawing with a
 * texture after it was swapped out or teximaged again.
 */

static mgaTextureObjectPtr
mgaAllocTexObj( struct gl_texture_object *tObj )
{
   mgaTextureObjectPtr t;


   t = CALLOC( sizeof( *t ) );
   tObj->DriverData = t;
   if ( t != NULL ) {
      /* Initialize non-image-dependent parts of the state:
       */
      t->base.tObj = tObj;

      t->setup.texctl = TMC_takey_1 | TMC_tamask_0;
      t->setup.texctl2 = TMC_ckstransdis_enable;
      t->setup.texfilter = TF_filteralpha_enable | TF_uvoffset_OGL;

      t->border_fallback = GL_FALSE;
      t->texenv_fallback = GL_FALSE;

      make_empty_list( & t->base );

      mgaSetTexWrapping( t, tObj->WrapS, tObj->WrapT );
      mgaSetTexFilter( t, tObj->MinFilter, tObj->MagFilter );
      mgaSetTexBorderColor( t, tObj->_BorderChan );
   }

   return( t );
}


static void mgaTexEnv( GLcontext *ctx, GLenum target,
			 GLenum pname, const GLfloat *param )
{
   GLuint unit = ctx->Texture.CurrentUnit;
   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);

   switch( pname ) {
   case GL_TEXTURE_ENV_COLOR: {
      GLubyte c[4];

      UNCLAMPED_FLOAT_TO_RGBA_CHAN( c, texUnit->EnvColor );
      mmesa->envcolor[unit] = PACK_COLOR_8888( c[3], c[0], c[1], c[2] );
      break;
   }
   }
}


static void mgaTexImage2D( GLcontext *ctx, GLenum target, GLint level,
			    GLint internalFormat,
			    GLint width, GLint height, GLint border,
			    GLenum format, GLenum type, const GLvoid *pixels,
			    const struct gl_pixelstore_attrib *packing,
			    struct gl_texture_object *texObj,
			    struct gl_texture_image *texImage )
{
   driTextureObject * t = (driTextureObject *) texObj->DriverData;

   if ( t != NULL ) {
      driSwapOutTextureObject( t );
   } 
   else {
      t = (driTextureObject *) mgaAllocTexObj( texObj );
      if ( t == NULL ) {
	 _mesa_error( ctx, GL_OUT_OF_MEMORY, "glTexImage2D" );
	 return;
      }
   }

   _mesa_store_teximage2d( ctx, target, level, internalFormat,
			   width, height, border, format, type,
			   pixels, packing, texObj, texImage );
   level -= t->firstLevel;
   if (level >= 0)
      t->dirty_images[0] |= (1UL << level);
}

static void mgaTexSubImage2D( GLcontext *ctx, 
			       GLenum target,
			       GLint level,	
			       GLint xoffset, GLint yoffset,
			       GLsizei width, GLsizei height,
			       GLenum format, GLenum type,
			       const GLvoid *pixels,
			       const struct gl_pixelstore_attrib *packing,
			       struct gl_texture_object *texObj,
			       struct gl_texture_image *texImage )
{
   driTextureObject * t = (driTextureObject *) texObj->DriverData;

   assert( t ); /* this _should_ be true */
   if ( t != NULL ) {
      driSwapOutTextureObject( t );
   } 
   else {
      t = (driTextureObject *) mgaAllocTexObj( texObj );
      if ( t == NULL ) {
	 _mesa_error( ctx, GL_OUT_OF_MEMORY, "glTexImage2D" );
	 return;
      }
   }

   _mesa_store_texsubimage2d(ctx, target, level, xoffset, yoffset, width, 
			     height, format, type, pixels, packing, texObj,
			     texImage);
   level -= t->firstLevel;
   if (level >= 0)
      t->dirty_images[0] |= (1UL << level);
}


/**
 * Changes variables and flags for a state update, which will happen at the
 * next UpdateTextureState
 */

static void
mgaTexParameter( GLcontext *ctx, GLenum target,
		   struct gl_texture_object *tObj,
		   GLenum pname, const GLfloat *params )
{
   mgaContextPtr mmesa = MGA_CONTEXT( ctx );
   mgaTextureObjectPtr t = (mgaTextureObjectPtr) tObj->DriverData;

   /* If we don't have a hardware texture, it will be automatically
    * created with current state before it is used, so we don't have
    * to do anything now 
    */
   if ( (t == NULL) ||
        (target != GL_TEXTURE_2D &&
         target != GL_TEXTURE_RECTANGLE_NV) ) {
      return;
   }

   switch (pname) {
   case GL_TEXTURE_MIN_FILTER:
      driSwapOutTextureObject( (driTextureObject *) t );
      /* FALLTHROUGH */
   case GL_TEXTURE_MAG_FILTER:
      FLUSH_BATCH(mmesa);
      mgaSetTexFilter( t, tObj->MinFilter, tObj->MagFilter );
      break;

   case GL_TEXTURE_WRAP_S:
   case GL_TEXTURE_WRAP_T:
      FLUSH_BATCH(mmesa);
      mgaSetTexWrapping(t,tObj->WrapS,tObj->WrapT);
      break;

   case GL_TEXTURE_BORDER_COLOR:
      FLUSH_BATCH(mmesa);
      mgaSetTexBorderColor(t, tObj->_BorderChan);
      break;

   case GL_TEXTURE_BASE_LEVEL:
   case GL_TEXTURE_MAX_LEVEL:
   case GL_TEXTURE_MIN_LOD:
   case GL_TEXTURE_MAX_LOD:
      /* This isn't the most efficient solution but there doesn't appear to
       * be a nice alternative.  Since there's no LOD clamping,
       * we just have to rely on loading the right subset of mipmap levels
       * to simulate a clamped LOD.
       */
      driSwapOutTextureObject( (driTextureObject *) t );
      break;

   default:
      return;
   }
}


static void
mgaBindTexture( GLcontext *ctx, GLenum target,
		  struct gl_texture_object *tObj )
{
   assert( (target != GL_TEXTURE_2D && target != GL_TEXTURE_RECTANGLE_NV) ||
           (tObj->DriverData != NULL) );
}


static void
mgaDeleteTexture( GLcontext *ctx, struct gl_texture_object *tObj )
{
   mgaContextPtr mmesa = MGA_CONTEXT( ctx );
   driTextureObject * t = (driTextureObject *) tObj->DriverData;

   if ( t ) {
      if ( mmesa ) {
	 FLUSH_BATCH( mmesa );
      }

      driDestroyTextureObject( t );
   }

   /* Free mipmap images and the texture object itself */
   _mesa_delete_texture_object(ctx, tObj);
}


/**
 * Allocate a new texture object.
 * Called via ctx->Driver.NewTextureObject.
 * Note: this function will be called during context creation to
 * allocate the default texture objects.
 * Note: we could use containment here to 'derive' the driver-specific
 * texture object from the core mesa gl_texture_object.  Not done at this time.
 */
static struct gl_texture_object *
mgaNewTextureObject( GLcontext *ctx, GLuint name, GLenum target )
{
   struct gl_texture_object *obj;
   obj = _mesa_new_texture_object(ctx, name, target);
   mgaAllocTexObj( obj );
   return obj;
}


void
mgaInitTextureFuncs( struct dd_function_table *functions )
{
   functions->ChooseTextureFormat	= mgaChooseTextureFormat;
   functions->TexImage2D		= mgaTexImage2D;
   functions->TexSubImage2D		= mgaTexSubImage2D;
   functions->BindTexture		= mgaBindTexture;
   functions->NewTextureObject		= mgaNewTextureObject;
   functions->DeleteTexture		= mgaDeleteTexture;
   functions->IsTextureResident		= driIsTextureResident;
   functions->TexEnv			= mgaTexEnv;
   functions->TexParameter		= mgaTexParameter;
}