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 "GrTypesPriv.h"
12 #include "gl/GrGLDefines.h"
13 #include "gl/GrGLFunctions.h"
14 #include "SkTArray.h"
15
16 class GrGLVertexBuffer;
17 class GrGLIndexBuffer;
18 class GrGLGpu;
19
20 struct GrGLAttribLayout {
21 GrGLint fCount;
22 GrGLenum fType;
23 GrGLboolean fNormalized;
24 };
25
GrGLAttribTypeToLayout(GrVertexAttribType type)26 static inline const GrGLAttribLayout& GrGLAttribTypeToLayout(GrVertexAttribType type) {
27 SkASSERT(type >= 0 && type < kGrVertexAttribTypeCount);
28 static const GrGLAttribLayout kLayouts[kGrVertexAttribTypeCount] = {
29 {1, GR_GL_FLOAT, false}, // kFloat_GrVertexAttribType
30 {2, GR_GL_FLOAT, false}, // kVec2f_GrVertexAttribType
31 {3, GR_GL_FLOAT, false}, // kVec3f_GrVertexAttribType
32 {4, GR_GL_FLOAT, false}, // kVec4f_GrVertexAttribType
33 {1, GR_GL_UNSIGNED_BYTE, true}, // kUByte_GrVertexAttribType
34 {4, GR_GL_UNSIGNED_BYTE, true}, // kVec4ub_GrVertexAttribType
35 {2, GR_GL_SHORT, false}, // kVec2s_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 == kUByte_GrVertexAttribType);
42 GR_STATIC_ASSERT(5 == kVec4ub_GrVertexAttribType);
43 GR_STATIC_ASSERT(6 == kVec2s_GrVertexAttribType);
44 GR_STATIC_ASSERT(SK_ARRAY_COUNT(kLayouts) == kGrVertexAttribTypeCount);
45 return kLayouts[type];
46 }
47
48 /**
49 * This sets and tracks the vertex attribute array state. It is used internally by GrGLVertexArray
50 * (below) but is separate because it is also used to track the state of vertex array object 0.
51 */
52 class GrGLAttribArrayState {
53 public:
54 explicit GrGLAttribArrayState(int arrayCount = 0) {
55 this->resize(arrayCount);
56 }
57
resize(int newCount)58 void resize(int newCount) {
59 fAttribArrayStates.resize_back(newCount);
60 for (int i = 0; i < newCount; ++i) {
61 fAttribArrayStates[i].invalidate();
62 }
63 }
64
65 /**
66 * This function enables and sets vertex attrib state for the specified attrib index. It is
67 * assumed that the GrGLAttribArrayState is tracking the state of the currently bound vertex
68 * array object.
69 */
70 void set(const GrGLGpu*,
71 int index,
72 GrGLVertexBuffer*,
73 GrGLint size,
74 GrGLenum type,
75 GrGLboolean normalized,
76 GrGLsizei stride,
77 GrGLvoid* offset);
78
79 /**
80 * This function disables vertex attribs not present in the mask. It is assumed that the
81 * GrGLAttribArrayState is tracking the state of the currently bound vertex array object.
82 */
83 void disableUnusedArrays(const GrGLGpu*, uint64_t usedAttribArrayMask);
84
invalidate()85 void invalidate() {
86 int count = fAttribArrayStates.count();
87 for (int i = 0; i < count; ++i) {
88 fAttribArrayStates[i].invalidate();
89 }
90 }
91
notifyVertexBufferDelete(GrGLuint id)92 void notifyVertexBufferDelete(GrGLuint id) {
93 int count = fAttribArrayStates.count();
94 for (int i = 0; i < count; ++i) {
95 if (fAttribArrayStates[i].fAttribPointerIsValid &&
96 id == fAttribArrayStates[i].fVertexBufferID) {
97 fAttribArrayStates[i].invalidate();
98 }
99 }
100 }
101
102 /**
103 * The number of attrib arrays that this object is configured to track.
104 */
count()105 int count() const { return fAttribArrayStates.count(); }
106
107 private:
108 /**
109 * Tracks the state of glVertexAttribArray for an attribute index.
110 */
111 struct AttribArrayState {
invalidateAttribArrayState112 void invalidate() {
113 fEnableIsValid = false;
114 fAttribPointerIsValid = false;
115 }
116
117 bool fEnableIsValid;
118 bool fAttribPointerIsValid;
119 bool fEnabled;
120 GrGLuint fVertexBufferID;
121 GrGLint fSize;
122 GrGLenum fType;
123 GrGLboolean fNormalized;
124 GrGLsizei fStride;
125 GrGLvoid* fOffset;
126 };
127
128 SkSTArray<16, AttribArrayState, true> fAttribArrayStates;
129 };
130
131 /**
132 * This class represents an OpenGL vertex array object. It manages the lifetime of the vertex array
133 * and is used to track the state of the vertex array to avoid redundant GL calls.
134 */
135 class GrGLVertexArray {
136 public:
137 GrGLVertexArray(GrGLint id, int attribCount);
138
139 /**
140 * Binds this vertex array. If the ID has been deleted or abandoned then NULL is returned.
141 * Otherwise, the GrGLAttribArrayState that is tracking this vertex array's attrib bindings is
142 * returned.
143 */
144 GrGLAttribArrayState* bind(GrGLGpu*);
145
146 /**
147 * This is a version of the above function that also binds an index buffer to the vertex
148 * array object.
149 */
150 GrGLAttribArrayState* bindWithIndexBuffer(GrGLGpu* gpu, const GrGLIndexBuffer*);
151
152 void notifyIndexBufferDelete(GrGLuint bufferID);
153
notifyVertexBufferDelete(GrGLuint id)154 void notifyVertexBufferDelete(GrGLuint id) {
155 fAttribArrays.notifyVertexBufferDelete(id);
156 }
157
arrayID()158 GrGLuint arrayID() const { return fID; }
159
160 void invalidateCachedState();
161
162 private:
163 GrGLuint fID;
164 GrGLAttribArrayState fAttribArrays;
165 GrGLuint fIndexBufferID;
166 bool fIndexBufferIDIsValid;
167 };
168
169 #endif
170