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      1 /*
      2  * Copyright 2013 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #ifndef GrGLVertexArray_DEFINED
      9 #define GrGLVertexArray_DEFINED
     10 
     11 #include "GrGpuResource.h"
     12 #include "GrTypesPriv.h"
     13 #include "gl/GrGLDefines.h"
     14 #include "gl/GrGLFunctions.h"
     15 
     16 #include "SkTArray.h"
     17 
     18 class GrGLVertexBuffer;
     19 class GrGLIndexBuffer;
     20 class GrGpuGL;
     21 
     22 struct GrGLAttribLayout {
     23     GrGLint     fCount;
     24     GrGLenum    fType;
     25     GrGLboolean fNormalized;
     26 };
     27 
     28 static inline const GrGLAttribLayout& GrGLAttribTypeToLayout(GrVertexAttribType type) {
     29     SkASSERT(type >= 0 && type < kGrVertexAttribTypeCount);
     30     static const GrGLAttribLayout kLayouts[kGrVertexAttribTypeCount] = {
     31         {1, GR_GL_FLOAT, false},         // kFloat_GrVertexAttribType
     32         {2, GR_GL_FLOAT, false},         // kVec2f_GrVertexAttribType
     33         {3, GR_GL_FLOAT, false},         // kVec3f_GrVertexAttribType
     34         {4, GR_GL_FLOAT, false},         // kVec4f_GrVertexAttribType
     35         {4, GR_GL_UNSIGNED_BYTE, true},  // kVec4ub_GrVertexAttribType
     36     };
     37     GR_STATIC_ASSERT(0 == kFloat_GrVertexAttribType);
     38     GR_STATIC_ASSERT(1 == kVec2f_GrVertexAttribType);
     39     GR_STATIC_ASSERT(2 == kVec3f_GrVertexAttribType);
     40     GR_STATIC_ASSERT(3 == kVec4f_GrVertexAttribType);
     41     GR_STATIC_ASSERT(4 == kVec4ub_GrVertexAttribType);
     42     GR_STATIC_ASSERT(SK_ARRAY_COUNT(kLayouts) == kGrVertexAttribTypeCount);
     43     return kLayouts[type];
     44 }
     45 
     46 /**
     47  * This sets and tracks the vertex attribute array state. It is used internally by GrGLVertexArray
     48  * (below) but is separate because it is also used to track the state of vertex array object 0.
     49  */
     50 class GrGLAttribArrayState {
     51 public:
     52     explicit GrGLAttribArrayState(int arrayCount = 0) {
     53         this->resize(arrayCount);
     54     }
     55 
     56     void resize(int newCount) {
     57         fAttribArrayStates.resize_back(newCount);
     58         for (int i = 0; i < newCount; ++i) {
     59             fAttribArrayStates[i].invalidate();
     60         }
     61     }
     62 
     63     /**
     64      * This function enables and sets vertex attrib state for the specified attrib index. It is
     65      * assumed that the GrGLAttribArrayState is tracking the state of the currently bound vertex
     66      * array object.
     67      */
     68     void set(const GrGpuGL*,
     69              int index,
     70              GrGLVertexBuffer*,
     71              GrGLint size,
     72              GrGLenum type,
     73              GrGLboolean normalized,
     74              GrGLsizei stride,
     75              GrGLvoid* offset);
     76 
     77     /**
     78      * This function disables vertex attribs not present in the mask. It is assumed that the
     79      * GrGLAttribArrayState is tracking the state of the currently bound vertex array object.
     80      */
     81     void disableUnusedArrays(const GrGpuGL*, uint64_t usedAttribArrayMask);
     82 
     83     void invalidate() {
     84         int count = fAttribArrayStates.count();
     85         for (int i = 0; i < count; ++i) {
     86             fAttribArrayStates[i].invalidate();
     87         }
     88     }
     89 
     90     void notifyVertexBufferDelete(GrGLuint id) {
     91         int count = fAttribArrayStates.count();
     92         for (int i = 0; i < count; ++i) {
     93             if (fAttribArrayStates[i].fAttribPointerIsValid &&
     94                 id == fAttribArrayStates[i].fVertexBufferID) {
     95                 fAttribArrayStates[i].invalidate();
     96             }
     97         }
     98     }
     99 
    100     /**
    101      * The number of attrib arrays that this object is configured to track.
    102      */
    103     int count() const { return fAttribArrayStates.count(); }
    104 
    105 private:
    106     /**
    107      * Tracks the state of glVertexAttribArray for an attribute index.
    108      */
    109     struct AttribArrayState {
    110             void invalidate() {
    111                 fEnableIsValid = false;
    112                 fAttribPointerIsValid = false;
    113             }
    114 
    115             bool        fEnableIsValid;
    116             bool        fAttribPointerIsValid;
    117             bool        fEnabled;
    118             GrGLuint    fVertexBufferID;
    119             GrGLint     fSize;
    120             GrGLenum    fType;
    121             GrGLboolean fNormalized;
    122             GrGLsizei   fStride;
    123             GrGLvoid*   fOffset;
    124     };
    125 
    126     SkSTArray<16, AttribArrayState, true> fAttribArrayStates;
    127 };
    128 
    129 /**
    130  * This class represents an OpenGL vertex array object. It manages the lifetime of the vertex array
    131  * and is used to track the state of the vertex array to avoid redundant GL calls.
    132  */
    133 class GrGLVertexArray : public GrGpuResource {
    134 public:
    135     GrGLVertexArray(GrGpuGL* gpu, GrGLint id, int attribCount);
    136 
    137     /**
    138      * Binds this vertex array. If the ID has been deleted or abandoned then NULL is returned.
    139      * Otherwise, the GrGLAttribArrayState that is tracking this vertex array's attrib bindings is
    140      * returned.
    141      */
    142     GrGLAttribArrayState* bind();
    143 
    144     /**
    145      * This is a version of the above function that also binds an index buffer to the vertex
    146      * array object.
    147      */
    148     GrGLAttribArrayState* bindWithIndexBuffer(const GrGLIndexBuffer* indexBuffer);
    149 
    150     void notifyIndexBufferDelete(GrGLuint bufferID);
    151 
    152     void notifyVertexBufferDelete(GrGLuint id) {
    153         fAttribArrays.notifyVertexBufferDelete(id);
    154     }
    155 
    156     GrGLuint arrayID() const { return fID; }
    157 
    158     void invalidateCachedState();
    159 
    160     virtual size_t gpuMemorySize() const SK_OVERRIDE { return 0; }
    161 
    162 protected:
    163     virtual void onAbandon() SK_OVERRIDE;
    164 
    165     virtual void onRelease() SK_OVERRIDE;
    166 
    167 private:
    168     GrGLuint                fID;
    169     GrGLAttribArrayState    fAttribArrays;
    170     GrGLuint                fIndexBufferID;
    171     bool                    fIndexBufferIDIsValid;
    172 
    173     typedef GrGpuResource INHERITED;
    174 };
    175 
    176 #endif
    177