texstate.c

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

}


void GLAPIENTRY
_mesa_GetTexLevelParameterfv( GLenum target, GLint level,
                              GLenum pname, GLfloat *params )
{
   GLint iparam;
   _mesa_GetTexLevelParameteriv( target, level, pname, &iparam );
   *params = (GLfloat) iparam;
}


static GLuint
tex_image_dimensions(GLcontext *ctx, GLenum target)
{
   switch (target) {
      case GL_TEXTURE_1D:
      case GL_PROXY_TEXTURE_1D:
         return 1;
      case GL_TEXTURE_2D:
      case GL_PROXY_TEXTURE_2D:
         return 2;
      case GL_TEXTURE_3D:
      case GL_PROXY_TEXTURE_3D:
         return 3;
      case GL_TEXTURE_CUBE_MAP:
      case GL_PROXY_TEXTURE_CUBE_MAP:
      case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
      case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
      case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
      case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
      case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
      case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
         return ctx->Extensions.ARB_texture_cube_map ? 2 : 0;
      case GL_TEXTURE_RECTANGLE_NV:
      case GL_PROXY_TEXTURE_RECTANGLE_NV:
         return ctx->Extensions.NV_texture_rectangle ? 2 : 0;
      case GL_TEXTURE_1D_ARRAY_EXT:
      case GL_PROXY_TEXTURE_1D_ARRAY_EXT:
         return ctx->Extensions.MESA_texture_array ? 2 : 0;
      case GL_TEXTURE_2D_ARRAY_EXT:
      case GL_PROXY_TEXTURE_2D_ARRAY_EXT:
         return ctx->Extensions.MESA_texture_array ? 3 : 0;
      default:
         _mesa_problem(ctx, "bad target in _mesa_tex_target_dimensions()");
         return 0;
   }
}


void GLAPIENTRY
_mesa_GetTexLevelParameteriv( GLenum target, GLint level,
                              GLenum pname, GLint *params )
{
   const struct gl_texture_unit *texUnit;
   struct gl_texture_object *texObj;
   const struct gl_texture_image *img = NULL;
   GLuint dimensions;
   GLboolean isProxy;
   GLint maxLevels;
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureImageUnits) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "glGetTexLevelParameteriv(current unit)");
      return;
   }

   texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];

   /* this will catch bad target values */
   dimensions = tex_image_dimensions(ctx, target);  /* 1, 2 or 3 */
   if (dimensions == 0) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexLevelParameter[if]v(target)");
      return;
   }

   maxLevels = _mesa_max_texture_levels(ctx, target);
   if (maxLevels == 0) {
      /* should not happen since <target> was just checked above */
      _mesa_problem(ctx, "maxLevels=0 in _mesa_GetTexLevelParameter");
      return;
   }

   if (level < 0 || level >= maxLevels) {
      _mesa_error( ctx, GL_INVALID_VALUE, "glGetTexLevelParameter[if]v" );
      return;
   }

   texObj = _mesa_select_tex_object(ctx, texUnit, target);
   _mesa_lock_texture(ctx, texObj);

   img = _mesa_select_tex_image(ctx, texObj, target, level);
   if (!img || !img->TexFormat) {
      /* undefined texture image */
      if (pname == GL_TEXTURE_COMPONENTS)
         *params = 1;
      else
         *params = 0;
      goto out;
   }

   isProxy = _mesa_is_proxy_texture(target);

   switch (pname) {
      case GL_TEXTURE_WIDTH:
         *params = img->Width;
         break;
      case GL_TEXTURE_HEIGHT:
         *params = img->Height;
         break;
      case GL_TEXTURE_DEPTH:
         *params = img->Depth;
         break;
      case GL_TEXTURE_INTERNAL_FORMAT:
         *params = img->InternalFormat;
         break;
      case GL_TEXTURE_BORDER:
         *params = img->Border;
         break;
      case GL_TEXTURE_RED_SIZE:
         if (img->_BaseFormat == GL_RGB || img->_BaseFormat == GL_RGBA)
            *params = img->TexFormat->RedBits;
         else
            *params = 0;
         break;
      case GL_TEXTURE_GREEN_SIZE:
         if (img->_BaseFormat == GL_RGB || img->_BaseFormat == GL_RGBA)
            *params = img->TexFormat->GreenBits;
         else
            *params = 0;
         break;
      case GL_TEXTURE_BLUE_SIZE:
         if (img->_BaseFormat == GL_RGB || img->_BaseFormat == GL_RGBA)
            *params = img->TexFormat->BlueBits;
         else
            *params = 0;
         break;
      case GL_TEXTURE_ALPHA_SIZE:
         if (img->_BaseFormat == GL_ALPHA ||
             img->_BaseFormat == GL_LUMINANCE_ALPHA ||
             img->_BaseFormat == GL_RGBA)
            *params = img->TexFormat->AlphaBits;
         else
            *params = 0;
         break;
      case GL_TEXTURE_INTENSITY_SIZE:
         if (img->_BaseFormat != GL_INTENSITY)
            *params = 0;
         else if (img->TexFormat->IntensityBits > 0)
            *params = img->TexFormat->IntensityBits;
         else /* intensity probably stored as rgb texture */
            *params = MIN2(img->TexFormat->RedBits, img->TexFormat->GreenBits);
         break;
      case GL_TEXTURE_LUMINANCE_SIZE:
         if (img->_BaseFormat != GL_LUMINANCE &&
             img->_BaseFormat != GL_LUMINANCE_ALPHA)
            *params = 0;
         else if (img->TexFormat->LuminanceBits > 0)
            *params = img->TexFormat->LuminanceBits;
         else /* luminance probably stored as rgb texture */
            *params = MIN2(img->TexFormat->RedBits, img->TexFormat->GreenBits);
         break;
      case GL_TEXTURE_INDEX_SIZE_EXT:
         if (img->_BaseFormat == GL_COLOR_INDEX)
            *params = img->TexFormat->IndexBits;
         else
            *params = 0;
         break;
      case GL_TEXTURE_DEPTH_SIZE_ARB:
         if (ctx->Extensions.SGIX_depth_texture ||
             ctx->Extensions.ARB_depth_texture)
            *params = img->TexFormat->DepthBits;
         else
            _mesa_error(ctx, GL_INVALID_ENUM,
                        "glGetTexLevelParameter[if]v(pname)");
         break;
      case GL_TEXTURE_STENCIL_SIZE_EXT:
         if (ctx->Extensions.EXT_packed_depth_stencil) {
            *params = img->TexFormat->StencilBits;
         }
         else {
            _mesa_error(ctx, GL_INVALID_ENUM,
                        "glGetTexLevelParameter[if]v(pname)");
         }
         break;

      /* GL_ARB_texture_compression */
      case GL_TEXTURE_COMPRESSED_IMAGE_SIZE:
         if (ctx->Extensions.ARB_texture_compression) {
            if (img->IsCompressed && !isProxy) {
               /* Don't use ctx->Driver.CompressedTextureSize() since that
                * may returned a padded hardware size.
                */
               *params = _mesa_compressed_texture_size(ctx, img->Width,
                                                   img->Height, img->Depth,
                                                   img->TexFormat->MesaFormat);
            }
            else {
               _mesa_error(ctx, GL_INVALID_OPERATION,
                           "glGetTexLevelParameter[if]v(pname)");
            }
         }
         else {
            _mesa_error(ctx, GL_INVALID_ENUM,
                        "glGetTexLevelParameter[if]v(pname)");
         }
         break;
      case GL_TEXTURE_COMPRESSED:
         if (ctx->Extensions.ARB_texture_compression) {
            *params = (GLint) img->IsCompressed;
         }
         else {
            _mesa_error(ctx, GL_INVALID_ENUM,
                        "glGetTexLevelParameter[if]v(pname)");
         }
         break;

      /* GL_ARB_texture_float */
      case GL_TEXTURE_RED_TYPE_ARB:
         if (ctx->Extensions.ARB_texture_float) {
            *params = img->TexFormat->RedBits ? img->TexFormat->DataType : GL_NONE;
         }
         else {
            _mesa_error(ctx, GL_INVALID_ENUM,
                        "glGetTexLevelParameter[if]v(pname)");
         }
         break;
      case GL_TEXTURE_GREEN_TYPE_ARB:
         if (ctx->Extensions.ARB_texture_float) {
            *params = img->TexFormat->GreenBits ? img->TexFormat->DataType : GL_NONE;
         }
         else {
            _mesa_error(ctx, GL_INVALID_ENUM,
                        "glGetTexLevelParameter[if]v(pname)");
         }
         break;
      case GL_TEXTURE_BLUE_TYPE_ARB:
         if (ctx->Extensions.ARB_texture_float) {
            *params = img->TexFormat->BlueBits ? img->TexFormat->DataType : GL_NONE;
         }
         else {
            _mesa_error(ctx, GL_INVALID_ENUM,
                        "glGetTexLevelParameter[if]v(pname)");
         }
         break;
      case GL_TEXTURE_ALPHA_TYPE_ARB:
         if (ctx->Extensions.ARB_texture_float) {
            *params = img->TexFormat->AlphaBits ? img->TexFormat->DataType : GL_NONE;
         }
         else {
            _mesa_error(ctx, GL_INVALID_ENUM,
                        "glGetTexLevelParameter[if]v(pname)");
         }
         break;
      case GL_TEXTURE_LUMINANCE_TYPE_ARB:
         if (ctx->Extensions.ARB_texture_float) {
            *params = img->TexFormat->LuminanceBits ? img->TexFormat->DataType : GL_NONE;
         }
         else {
            _mesa_error(ctx, GL_INVALID_ENUM,
                        "glGetTexLevelParameter[if]v(pname)");
         }
         break;
      case GL_TEXTURE_INTENSITY_TYPE_ARB:
         if (ctx->Extensions.ARB_texture_float) {
            *params = img->TexFormat->IntensityBits ? img->TexFormat->DataType : GL_NONE;
         }
         else {
            _mesa_error(ctx, GL_INVALID_ENUM,
                        "glGetTexLevelParameter[if]v(pname)");
         }
         break;
      case GL_TEXTURE_DEPTH_TYPE_ARB:
         if (ctx->Extensions.ARB_texture_float) {
            *params = img->TexFormat->DepthBits ? img->TexFormat->DataType : GL_NONE;
         }
         else {
            _mesa_error(ctx, GL_INVALID_ENUM,
                        "glGetTexLevelParameter[if]v(pname)");
         }
         break;

      default:
         _mesa_error(ctx, GL_INVALID_ENUM,
                     "glGetTexLevelParameter[if]v(pname)");
   }

 out:
   _mesa_unlock_texture(ctx, texObj);
}



void GLAPIENTRY
_mesa_GetTexParameterfv( GLenum target, GLenum pname, GLfloat *params )
{
   struct gl_texture_unit *texUnit;
   struct gl_texture_object *obj;
   GLboolean error = GL_FALSE;
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureImageUnits) {
      _mesa_error(ctx, GL_INVALID_OPERATION,
                  "glGetTexParameterfv(current unit)");
      return;
   }

   texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];

   obj = _mesa_select_tex_object(ctx, texUnit, target);
   if (!obj) {
      _mesa_error(ctx, GL_INVALID_ENUM, "glGetTexParameterfv(target)");
      return;
   }

   _mesa_lock_texture(ctx, obj);
   switch (pname) {
      case GL_TEXTURE_MAG_FILTER:
	 *params = ENUM_TO_FLOAT(obj->MagFilter);
	 break;
      case GL_TEXTURE_MIN_FILTER:
         *params = ENUM_TO_FLOAT(obj->MinFilter);
         break;
      case GL_TEXTURE_WRAP_S:
         *params = ENUM_TO_FLOAT(obj->WrapS);
         break;
      case GL_TEXTURE_WRAP_T:
         *params = ENUM_TO_FLOAT(obj->WrapT);
         break;
      case GL_TEXTURE_WRAP_R:
         *params = ENUM_TO_FLOAT(obj->WrapR);
         break;
      case GL_TEXTURE_BORDER_COLOR:
         params[0] = CLAMP(obj->BorderColor[0], 0.0F, 1.0F);
         params[1] = CLAMP(obj->BorderColor[1], 0.0F, 1.0F);
         params[2] = CLAMP(obj->BorderColor[2], 0.0F, 1.0F);
         params[3] = CLAMP(obj->BorderColor[3], 0.0F, 1.0F);
         break;
      case GL_TEXTURE_RESIDENT:
         {
            GLboolean resident;
            if (ctx->Driver.IsTextureResident)
               resident = ctx->Driver.IsTextureResident(ctx, obj);
            else
               resident = GL_TRUE;
            *params = ENUM_TO_FLOAT(resident);
         }
         break;
      case GL_TEXTURE_PRIORITY:
         *params = obj->Priority;
         break;
      case GL_TEXTURE_MIN_LOD:
         *params = obj->MinLod;
         break;
      case GL_TEXTURE_MAX_LOD:
         *params = obj->MaxLod;
         break;
      case GL_TEXTURE_BASE_LEVEL:
         *params = (GLfloat) obj->BaseLevel;
         break;
      case GL_TEXTURE_MAX_LEVEL:
         *params = (GLfloat) obj->MaxLevel;
         break;
      case GL_TEXTURE_MAX_ANISOTROPY_EXT:
         if (ctx->Extensions.EXT_texture_filter_anisotropic) {
            *params = obj->MaxAnisotropy;
         }
	 else
	    error = 1;
         break;
      case GL_TEXTURE_COMPARE_SGIX:
         if (ctx->Extensions.SGIX_shadow) {
            *params = (GLfloat) obj->CompareFlag;
         }
	 else 
	    error = 1;
         break;
      case GL_TEXTURE_COMPARE_OPERATOR_SGIX:
         if (ctx->Extensions.S