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
MarkShaderStorageBufferUsage(const Context * context)49 ANGLE_INLINE void MarkShaderStorageBufferUsage(const Context *context)
50 {
51 for (size_t index : context->getStateCache().getActiveShaderStorageBufferIndices())
52 {
53 gl::Buffer *buffer = context->getState().getIndexedShaderStorageBuffer(index).get();
54 if (buffer)
55 {
56 buffer->onDataChanged();
57 }
58 }
59 }
60
61 // Return true if the draw is a no-op, else return false.
62 // If there is no active program for the vertex or fragment shader stages, the results of vertex
63 // and fragment shader execution will respectively be undefined. However, this is not
64 // an error. ANGLE will treat this as a no-op.
65 // A no-op draw occurs if the count of vertices is less than the minimum required to
66 // have a valid primitive for this mode (0 for points, 0-1 for lines, 0-2 for tris).
noopDraw(PrimitiveMode mode,GLsizei count)67 ANGLE_INLINE bool Context::noopDraw(PrimitiveMode mode, GLsizei count)
68 {
69 if (!mStateCache.getCanDraw())
70 {
71 return true;
72 }
73
74 return count < kMinimumPrimitiveCounts[mode];
75 }
76
syncDirtyBits()77 ANGLE_INLINE angle::Result Context::syncDirtyBits()
78 {
79 const State::DirtyBits &dirtyBits = mState.getDirtyBits();
80 ANGLE_TRY(mImplementation->syncState(this, dirtyBits, mAllDirtyBits));
81 mState.clearDirtyBits();
82 return angle::Result::Continue;
83 }
84
syncDirtyBits(const State::DirtyBits & bitMask)85 ANGLE_INLINE angle::Result Context::syncDirtyBits(const State::DirtyBits &bitMask)
86 {
87 const State::DirtyBits &dirtyBits = (mState.getDirtyBits() & bitMask);
88 ANGLE_TRY(mImplementation->syncState(this, dirtyBits, bitMask));
89 mState.clearDirtyBits(dirtyBits);
90 return angle::Result::Continue;
91 }
92
syncDirtyObjects(const State::DirtyObjects & objectMask)93 ANGLE_INLINE angle::Result Context::syncDirtyObjects(const State::DirtyObjects &objectMask)
94 {
95 return mState.syncDirtyObjects(this, objectMask);
96 }
97
prepareForDraw(PrimitiveMode mode)98 ANGLE_INLINE angle::Result Context::prepareForDraw(PrimitiveMode mode)
99 {
100 if (mGLES1Renderer)
101 {
102 ANGLE_TRY(mGLES1Renderer->prepareForDraw(mode, this, &mState));
103 }
104
105 ANGLE_TRY(syncDirtyObjects(mDrawDirtyObjects));
106 ASSERT(!isRobustResourceInitEnabled() ||
107 !mState.getDrawFramebuffer()->hasResourceThatNeedsInit());
108 return syncDirtyBits();
109 }
110
drawArrays(PrimitiveMode mode,GLint first,GLsizei count)111 ANGLE_INLINE void Context::drawArrays(PrimitiveMode mode, GLint first, GLsizei count)
112 {
113 // No-op if count draws no primitives for given mode
114 if (noopDraw(mode, count))
115 {
116 return;
117 }
118
119 ANGLE_CONTEXT_TRY(prepareForDraw(mode));
120 ANGLE_CONTEXT_TRY(mImplementation->drawArrays(this, mode, first, count));
121 MarkTransformFeedbackBufferUsage(this, count, 1);
122 }
123
drawElements(PrimitiveMode mode,GLsizei count,DrawElementsType type,const void * indices)124 ANGLE_INLINE void Context::drawElements(PrimitiveMode mode,
125 GLsizei count,
126 DrawElementsType type,
127 const void *indices)
128 {
129 // No-op if count draws no primitives for given mode
130 if (noopDraw(mode, count))
131 {
132 return;
133 }
134
135 ANGLE_CONTEXT_TRY(prepareForDraw(mode));
136 ANGLE_CONTEXT_TRY(mImplementation->drawElements(this, mode, count, type, indices));
137 }
138
onBufferBindingChange(Context * context)139 ANGLE_INLINE void StateCache::onBufferBindingChange(Context *context)
140 {
141 updateBasicDrawStatesError();
142 updateBasicDrawElementsError();
143 }
144
bindBuffer(BufferBinding target,BufferID buffer)145 ANGLE_INLINE void Context::bindBuffer(BufferBinding target, BufferID buffer)
146 {
147 Buffer *bufferObject =
148 mState.mBufferManager->checkBufferAllocation(mImplementation.get(), buffer);
149 mState.setBufferBinding(this, target, bufferObject);
150 mStateCache.onBufferBindingChange(this);
151 }
152
153 } // namespace gl
154
155 #endif // LIBANGLE_CONTEXT_INL_H_
156