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      1 /*
      2  * Copyright (C) 2009 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef WebGLTexture_h
     27 #define WebGLTexture_h
     28 
     29 #include "bindings/v8/ScriptWrappable.h"
     30 #include "core/html/canvas/WebGLSharedObject.h"
     31 #include "wtf/PassRefPtr.h"
     32 #include "wtf/Vector.h"
     33 
     34 namespace WebCore {
     35 
     36 class WebGLTexture : public WebGLSharedObject, public ScriptWrappable {
     37 public:
     38     enum TextureExtensionFlag {
     39         NoTextureExtensionEnabled = 0,
     40         TextureFloatLinearExtensionEnabled = 1 << 0,
     41         TextureHalfFloatLinearExtensionEnabled = 1 << 1
     42     };
     43     virtual ~WebGLTexture();
     44 
     45     static PassRefPtr<WebGLTexture> create(WebGLRenderingContext*);
     46 
     47     void setTarget(GC3Denum target, GC3Dint maxLevel);
     48     void setParameteri(GC3Denum pname, GC3Dint param);
     49     void setParameterf(GC3Denum pname, GC3Dfloat param);
     50 
     51     GC3Denum getTarget() const { return m_target; }
     52 
     53     int getMinFilter() const { return m_minFilter; }
     54 
     55     void setLevelInfo(GC3Denum target, GC3Dint level, GC3Denum internalFormat, GC3Dsizei width, GC3Dsizei height, GC3Denum type);
     56 
     57     bool canGenerateMipmaps();
     58     // Generate all level information.
     59     void generateMipmapLevelInfo();
     60 
     61     GC3Denum getInternalFormat(GC3Denum target, GC3Dint level) const;
     62     GC3Denum getType(GC3Denum target, GC3Dint level) const;
     63     GC3Dsizei getWidth(GC3Denum target, GC3Dint level) const;
     64     GC3Dsizei getHeight(GC3Denum target, GC3Dint level) const;
     65     bool isValid(GC3Denum target, GC3Dint level) const;
     66 
     67     // Whether width/height is NotPowerOfTwo.
     68     static bool isNPOT(GC3Dsizei, GC3Dsizei);
     69 
     70     bool isNPOT() const;
     71     // Determine if texture sampling should always return [0, 0, 0, 1] (OpenGL ES 2.0 Sec 3.8.2).
     72     bool needToUseBlackTexture(TextureExtensionFlag) const;
     73 
     74     bool hasEverBeenBound() const { return object() && m_target; }
     75 
     76     static GC3Dint computeLevelCount(GC3Dsizei width, GC3Dsizei height);
     77 
     78 protected:
     79     WebGLTexture(WebGLRenderingContext*);
     80 
     81     virtual void deleteObjectImpl(GraphicsContext3D*, Platform3DObject);
     82 
     83 private:
     84     class LevelInfo {
     85     public:
     86         LevelInfo()
     87             : valid(false)
     88             , internalFormat(0)
     89             , width(0)
     90             , height(0)
     91             , type(0)
     92         {
     93         }
     94 
     95         void setInfo(GC3Denum internalFmt, GC3Dsizei w, GC3Dsizei h, GC3Denum tp)
     96         {
     97             valid = true;
     98             internalFormat = internalFmt;
     99             width = w;
    100             height = h;
    101             type = tp;
    102         }
    103 
    104         bool valid;
    105         GC3Denum internalFormat;
    106         GC3Dsizei width;
    107         GC3Dsizei height;
    108         GC3Denum type;
    109     };
    110 
    111     virtual bool isTexture() const { return true; }
    112 
    113     void update();
    114 
    115     int mapTargetToIndex(GC3Denum) const;
    116 
    117     const LevelInfo* getLevelInfo(GC3Denum target, GC3Dint level) const;
    118 
    119     GC3Denum m_target;
    120 
    121     GC3Denum m_minFilter;
    122     GC3Denum m_magFilter;
    123     GC3Denum m_wrapS;
    124     GC3Denum m_wrapT;
    125 
    126     Vector<Vector<LevelInfo> > m_info;
    127 
    128     bool m_isNPOT;
    129     bool m_isCubeComplete;
    130     bool m_isComplete;
    131     bool m_needToUseBlackTexture;
    132     bool m_isFloatType;
    133     bool m_isHalfFloatType;
    134 };
    135 
    136 } // namespace WebCore
    137 
    138 #endif // WebGLTexture_h
    139