Home | History | Annotate | Download | only in canvas 
      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 "WebGLObject.h"
     30 
     31 #include <wtf/PassRefPtr.h>
     32 #include <wtf/RefCounted.h>
     33 #include <wtf/Vector.h>
     34 
     35 namespace WebCore {
     36 
     37 class WebGLTexture : public WebGLObject {
     38 public:
     39     virtual ~WebGLTexture() { deleteObject(); }
     40 
     41     static PassRefPtr<WebGLTexture> create(WebGLRenderingContext*);
     42 
     43     void setTarget(GC3Denum target, GC3Dint maxLevel);
     44     void setParameteri(GC3Denum pname, GC3Dint param);
     45     void setParameterf(GC3Denum pname, GC3Dfloat param);
     46 
     47     GC3Denum getTarget() const { return m_target; }
     48 
     49     int getMinFilter() const { return m_minFilter; }
     50 
     51     void setLevelInfo(GC3Denum target, GC3Dint level, GC3Denum internalFormat, GC3Dsizei width, GC3Dsizei height, GC3Denum type);
     52 
     53     bool canGenerateMipmaps();
     54     // Generate all level information.
     55     void generateMipmapLevelInfo();
     56 
     57     GC3Denum getInternalFormat(GC3Denum target, GC3Dint level) const;
     58     GC3Denum getType(GC3Denum target, GC3Dint level) const;
     59     GC3Dsizei getWidth(GC3Denum target, GC3Dint level) const;
     60     GC3Dsizei getHeight(GC3Denum target, GC3Dint level) const;
     61 
     62     // Whether width/height is NotPowerOfTwo.
     63     static bool isNPOT(GC3Dsizei, GC3Dsizei);
     64 
     65     bool isNPOT() const;
     66     // Determine if texture sampling should always return [0, 0, 0, 1] (OpenGL ES 2.0 Sec 3.8.2).
     67     bool needToUseBlackTexture() const;
     68 
     69     bool hasEverBeenBound() const { return object() && m_target; }
     70 
     71     static GC3Dint computeLevelCount(GC3Dsizei width, GC3Dsizei height);
     72 
     73 protected:
     74     WebGLTexture(WebGLRenderingContext*);
     75 
     76     virtual void deleteObjectImpl(Platform3DObject);
     77 
     78 private:
     79     class LevelInfo {
     80     public:
     81         LevelInfo()
     82             : valid(false)
     83             , internalFormat(0)
     84             , width(0)
     85             , height(0)
     86             , type(0)
     87         {
     88         }
     89 
     90         void setInfo(GC3Denum internalFmt, GC3Dsizei w, GC3Dsizei h, GC3Denum tp)
     91         {
     92             valid = true;
     93             internalFormat = internalFmt;
     94             width = w;
     95             height = h;
     96             type = tp;
     97         }
     98 
     99         bool valid;
    100         GC3Denum internalFormat;
    101         GC3Dsizei width;
    102         GC3Dsizei height;
    103         GC3Denum type;
    104     };
    105 
    106     virtual bool isTexture() const { return true; }
    107 
    108     void update();
    109 
    110     int mapTargetToIndex(GC3Denum) const;
    111 
    112     const LevelInfo* getLevelInfo(GC3Denum target, GC3Dint level) const;
    113 
    114     GC3Denum m_target;
    115 
    116     GC3Denum m_minFilter;
    117     GC3Denum m_magFilter;
    118     GC3Denum m_wrapS;
    119     GC3Denum m_wrapT;
    120 
    121     Vector<Vector<LevelInfo> > m_info;
    122 
    123     bool m_isNPOT;
    124     bool m_isComplete;
    125     bool m_needToUseBlackTexture;
    126 };
    127 
    128 } // namespace WebCore
    129 
    130 #endif // WebGLTexture_h
    131