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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// File containing a base class for texture objects.
#ifndef O3D_CORE_CROSS_TEXTURE_BASE_H_
#define O3D_CORE_CROSS_TEXTURE_BASE_H_
#include "core/cross/param.h"
#include "core/cross/param_object.h"
namespace o3d {
class Bitmap;
class Pack;
class Renderer;
class RenderSurface;
// The Texture class is a base class for image data used in texture
// mapping. It is an abstract class. Concrete implementations should
// implement the GetTextureHandle() member function.
class Texture : public ParamObject {
public:
typedef SmartPointer<Texture> Ref;
typedef WeakPointer<Texture> WeakPointerType;
enum Format {
UNKNOWN_FORMAT,
XRGB8, // actual format in memory is B G R X
ARGB8, // actual format in memory is B G R A
ABGR16F,
R32F,
ABGR32F,
DXT1,
DXT3,
DXT5
};
// Defines how you want to access a texture when locking.
enum AccessMode {
kNone = 0,
kReadOnly = 1,
kWriteOnly = 2,
kReadWrite = 3,
};
typedef unsigned RGBASwizzleIndices[4];
// This is the maximum texture size we allow and hence the largest
// render target and depth stencil as well. This is because it's the limit of
// some low-end machines that are still pretty common.
//
// NOTE: class Bitmap supports a larger size. The plan is to expose Bitmap
// to Javascript so you can download larger images, scale them, then put
// them in a texture.
static const int kMaxDimension = 2048;
static const int kMaxLevels = 12;
Texture(ServiceLocator* service_locator,
Format format,
int levels,
bool enable_render_surfaces);
virtual ~Texture() {}
static const char* kLevelsParamName;
// Returns the implementation-specific texture handle.
virtual void* GetTextureHandle() const = 0;
static bool IsCompressedFormat(Format format) {
return format == DXT1 || format == DXT3 || format == DXT5;
}
bool IsCompressed() const {
return IsCompressedFormat(format_);
}
bool alpha_is_one() const { return alpha_is_one_; }
void set_alpha_is_one(bool value) { alpha_is_one_ = value; }
// Gets the levels.
int levels() const {
return levels_param_->value();
}
// Gets the format of the texture resource.
Format format() const {
return format_;
}
int update_count() {
return update_count_;
}
int render_count() {
CheckLastTextureUpdateRendered();
return render_count_;
}
bool render_surfaces_enabled() const {
return render_surfaces_enabled_;
}
// Generates mips.
virtual void GenerateMips(int source_level, int num_levels) = 0;
// Gets a RGBASwizzleIndices that contains a mapping from
// RGBA to the internal format used by the graphics API.
virtual const RGBASwizzleIndices& GetABGR32FSwizzleIndices() = 0;
// Gets a weak pointer to us.
WeakPointerType GetWeakPointer() const {
return weak_pointer_manager_.GetWeakPointer();
}
protected:
void set_levels(int levels) {
levels_param_->set_read_only_value(levels);
}
void set_format(Format format) {
format_ = format;
}
void TextureUpdated();
Renderer* renderer_;
private:
void CheckLastTextureUpdateRendered();
// The number of mipmap levels contained in this texture.
ParamInteger::Ref levels_param_;
// true if all the alpha values in this texture are 1.0.
bool alpha_is_one_;
// The data format of each pixel.
Format format_;
// Manager for weak pointers to us.
WeakPointerType::WeakPointerManager weak_pointer_manager_;
bool render_surfaces_enabled_;
// Counting of frames, to allow the page to determine the framerate of dynamic
// textures.
bool has_unrendered_update_;
int last_render_frame_count_;
int update_count_;
int render_count_;
O3D_DECL_CLASS(Texture, ParamObject);
DISALLOW_COPY_AND_ASSIGN(Texture);
};
class ParamTexture : public TypedRefParam<Texture> {
public:
typedef SmartPointer<ParamTexture> Ref;
ParamTexture(ServiceLocator* service_locator, bool dynamic, bool read_only)
: TypedRefParam<Texture>(service_locator, dynamic, read_only) {}
private:
friend class IClassManager;
static ObjectBase::Ref Create(ServiceLocator* service_locator);
O3D_DECL_CLASS(ParamTexture, RefParamBase);
DISALLOW_COPY_AND_ASSIGN(ParamTexture);
};
} // namespace o3d
#endif // O3D_CORE_CROSS_TEXTURE_BASE_H_
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