1 //
2 // Copyright 2018 The ANGLE Project Authors. All rights reserved.
3 // Use of this source code is governed by a BSD-style license that can be
4 // found in the LICENSE file.
5 //
6
7 // Context.inl.h: Defines inline functions of gl::Context class
8 // Has to be included after libANGLE/Context.h when using one
9 // of the defined functions
10
11 #ifndef LIBANGLE_CONTEXT_INL_H_
12 #define LIBANGLE_CONTEXT_INL_H_
13
14 #include "libANGLE/GLES1Renderer.h"
15 #include "libANGLE/renderer/ContextImpl.h"
16
17 #define ANGLE_HANDLE_ERR(X) \
18 (void)(X); \
19 return;
20 #define ANGLE_CONTEXT_TRY(EXPR) ANGLE_TRY_TEMPLATE(EXPR, ANGLE_HANDLE_ERR)
21
22 namespace gl
23 {
24 constexpr angle::PackedEnumMap<PrimitiveMode, GLsizei> kMinimumPrimitiveCounts = {{
25 {PrimitiveMode::Points, 1},
26 {PrimitiveMode::Lines, 2},
27 {PrimitiveMode::LineLoop, 2},
28 {PrimitiveMode::LineStrip, 2},
29 {PrimitiveMode::Triangles, 3},
30 {PrimitiveMode::TriangleStrip, 3},
31 {PrimitiveMode::TriangleFan, 3},
32 {PrimitiveMode::LinesAdjacency, 2},
33 {PrimitiveMode::LineStripAdjacency, 2},
34 {PrimitiveMode::TrianglesAdjacency, 3},
35 {PrimitiveMode::TriangleStripAdjacency, 3},
36 }};
37
MarkTransformFeedbackBufferUsage(const Context * context,GLsizei count,GLsizei instanceCount)38 ANGLE_INLINE void MarkTransformFeedbackBufferUsage(const Context *context,
39 GLsizei count,
40 GLsizei instanceCount)
41 {
42 if (context->getStateCache().isTransformFeedbackActiveUnpaused())
43 {
44 TransformFeedback *transformFeedback = context->getState().getCurrentTransformFeedback();
45 transformFeedback->onVerticesDrawn(context, count, instanceCount);
46 }
47 }
48
MarkShaderStorageUsage(const Context * context)49 ANGLE_INLINE void MarkShaderStorageUsage(const Context *context)
50 {
51 for (size_t index : context->getStateCache().getActiveShaderStorageBufferIndices())
52 {
53 Buffer *buffer = context->getState().getIndexedShaderStorageBuffer(index).get();
54 if (buffer)
55 {
56 buffer->onDataChanged();
57 }
58 }
59
60 for (size_t index : context->getStateCache().getActiveImageUnitIndices())
61 {
62 const ImageUnit &imageUnit = context->getState().getImageUnit(index);
63 const Texture *texture = imageUnit.texture.get();
64 if (texture)
65 {
66 texture->onStateChange(angle::SubjectMessage::ContentsChanged);
67 }
68 }
69 }
70
71 // Return true if the draw is a no-op, else return false.
72 // If there is no active program for the vertex or fragment shader stages, the results of vertex
73 // and fragment shader execution will respectively be undefined. However, this is not
74 // an error. ANGLE will treat this as a no-op.
75 // A no-op draw occurs if the count of vertices is less than the minimum required to
76 // have a valid primitive for this mode (0 for points, 0-1 for lines, 0-2 for tris).
noopDraw(PrimitiveMode mode,GLsizei count)77 ANGLE_INLINE bool Context::noopDraw(PrimitiveMode mode, GLsizei count) const
78 {
79 if (!mStateCache.getCanDraw())
80 {
81 return true;
82 }
83
84 return count < kMinimumPrimitiveCounts[mode];
85 }
86
syncDirtyBits()87 ANGLE_INLINE angle::Result Context::syncDirtyBits()
88 {
89 const State::DirtyBits &dirtyBits = mState.getDirtyBits();
90 ANGLE_TRY(mImplementation->syncState(this, dirtyBits, mAllDirtyBits));
91 mState.clearDirtyBits();
92 return angle::Result::Continue;
93 }
94
syncDirtyBits(const State::DirtyBits & bitMask)95 ANGLE_INLINE angle::Result Context::syncDirtyBits(const State::DirtyBits &bitMask)
96 {
97 const State::DirtyBits &dirtyBits = (mState.getDirtyBits() & bitMask);
98 ANGLE_TRY(mImplementation->syncState(this, dirtyBits, bitMask));
99 mState.clearDirtyBits(dirtyBits);
100 return angle::Result::Continue;
101 }
102
syncDirtyObjects(const State::DirtyObjects & objectMask,Command command)103 ANGLE_INLINE angle::Result Context::syncDirtyObjects(const State::DirtyObjects &objectMask,
104 Command command)
105 {
106 return mState.syncDirtyObjects(this, objectMask, command);
107 }
108
prepareForDraw(PrimitiveMode mode)109 ANGLE_INLINE angle::Result Context::prepareForDraw(PrimitiveMode mode)
110 {
111 if (mGLES1Renderer)
112 {
113 ANGLE_TRY(mGLES1Renderer->prepareForDraw(mode, this, &mState));
114 }
115
116 ANGLE_TRY(syncDirtyObjects(mDrawDirtyObjects, Command::Draw));
117 ASSERT(!isRobustResourceInitEnabled() ||
118 !mState.getDrawFramebuffer()->hasResourceThatNeedsInit());
119 return syncDirtyBits();
120 }
121
drawArrays(PrimitiveMode mode,GLint first,GLsizei count)122 ANGLE_INLINE void Context::drawArrays(PrimitiveMode mode, GLint first, GLsizei count)
123 {
124 // No-op if count draws no primitives for given mode
125 if (noopDraw(mode, count))
126 {
127 return;
128 }
129
130 ANGLE_CONTEXT_TRY(prepareForDraw(mode));
131 ANGLE_CONTEXT_TRY(mImplementation->drawArrays(this, mode, first, count));
132 MarkTransformFeedbackBufferUsage(this, count, 1);
133 }
134
drawElements(PrimitiveMode mode,GLsizei count,DrawElementsType type,const void * indices)135 ANGLE_INLINE void Context::drawElements(PrimitiveMode mode,
136 GLsizei count,
137 DrawElementsType type,
138 const void *indices)
139 {
140 // No-op if count draws no primitives for given mode
141 if (noopDraw(mode, count))
142 {
143 return;
144 }
145
146 ANGLE_CONTEXT_TRY(prepareForDraw(mode));
147 ANGLE_CONTEXT_TRY(mImplementation->drawElements(this, mode, count, type, indices));
148 }
149
onBufferBindingChange(Context * context)150 ANGLE_INLINE void StateCache::onBufferBindingChange(Context *context)
151 {
152 updateBasicDrawStatesError();
153 updateBasicDrawElementsError();
154 }
155
bindBuffer(BufferBinding target,BufferID buffer)156 ANGLE_INLINE void Context::bindBuffer(BufferBinding target, BufferID buffer)
157 {
158 Buffer *bufferObject =
159 mState.mBufferManager->checkBufferAllocation(mImplementation.get(), buffer);
160 mState.setBufferBinding(this, target, bufferObject);
161 mStateCache.onBufferBindingChange(this);
162 }
163
164 } // namespace gl
165
166 #endif // LIBANGLE_CONTEXT_INL_H_
167