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Reduce Apple OpenGL vertex state churn #6032

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dc3a7d1
Reduce Apple OpenGL vertex state churn
LisaScheers Jul 23, 2026
717b9ba
Clarify vertex attribute cache ownership
LisaScheers Aug 14, 2026
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9 changes: 8 additions & 1 deletion indra/llrender/llglslshader.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1060,7 +1060,14 @@ void LLGLSLShader::bind()
{
sCurBoundShaderPtr->readProfileQuery();
}
LLVertexBuffer::unbind();
// Apple's OpenGL-on-Metal layer pays a high price for rebinding buffer
// objects on every shader transition. LLVertexBuffer tracks the
// attribute formats needed by the new shader, so the current buffer
// can remain bound until a draw actually selects a different one.
if (!gGLManager.mIsApple)
{
LLVertexBuffer::unbind();
}
glUseProgram(mProgramObject);
sCurBoundShader = mProgramObject;
sCurBoundShaderPtr = this;
Expand Down
72 changes: 48 additions & 24 deletions indra/llrender/llvertexbuffer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -682,6 +682,13 @@ U32 LLVertexBuffer::sGLRenderIndices = 0;
U32 LLVertexBuffer::sLastMask = 0;
U32 LLVertexBuffer::sVertexCount = 0;

// Attribute pointer state belongs to the currently bound array buffer. Keep
// enough state to avoid resubmitting identical formats to OpenGL-on-Metal.
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static U32 sVertexAttribsConfigured = 0;
static U32 sColorPointerSource = 0;
static constexpr U32 COLOR_POINTER_COLOR = 1;
static constexpr U32 COLOR_POINTER_EMISSIVE = 2;


//NOTE: each component must be AT LEAST 4 bytes in size to avoid a performance penalty on AMD hardware
const U32 LLVertexBuffer::sTypeSize[LLVertexBuffer::TYPE_MAX] =
Expand Down Expand Up @@ -972,6 +979,8 @@ void LLVertexBuffer::unbind()
STOP_GLERROR;
sGLRenderBuffer = 0;
sGLRenderIndices = 0;
sVertexAttribsConfigured = 0;
sColorPointerSource = 0;
}

//static
Expand Down Expand Up @@ -1444,12 +1453,16 @@ void LLVertexBuffer::_unmapBuffer()
mGLBuffer = gen_buffer();
glBindBuffer(GL_ARRAY_BUFFER, mGLBuffer);
sGLRenderBuffer = mGLBuffer;
sVertexAttribsConfigured = 0;
sColorPointerSource = 0;
glBufferData(GL_ARRAY_BUFFER, mSize, mMappedData, GL_STATIC_DRAW);
}
else if (mGLBuffer != sGLRenderBuffer)
{
glBindBuffer(GL_ARRAY_BUFFER, mGLBuffer);
sGLRenderBuffer = mGLBuffer;
sVertexAttribsConfigured = 0;
sColorPointerSource = 0;
}
STOP_GLERROR;

Expand Down Expand Up @@ -1689,10 +1702,12 @@ void LLVertexBuffer::setBuffer()
{
glBindBuffer(GL_ARRAY_BUFFER, mGLBuffer);
sGLRenderBuffer = mGLBuffer;
sVertexAttribsConfigured = 0;
sColorPointerSource = 0;

setupVertexBuffer();
}
else if (sLastMask != data_mask)
else if (gGLManager.mIsApple || sLastMask != data_mask)
{
setupVertexBuffer();
sLastMask = data_mask;
Expand All @@ -1715,98 +1730,108 @@ void LLVertexBuffer::setupVertexBuffer()
U8* base = nullptr;

U32 data_mask = LLGLSLShader::sCurBoundShaderPtr->mAttributeMask;
U32 setup_mask = gGLManager.mIsApple ?
data_mask & ~sVertexAttribsConfigured : data_mask;

if (data_mask & MAP_NORMAL)
if (setup_mask & MAP_NORMAL)
{
AttributeType loc = TYPE_NORMAL;
void* ptr = (void*)(base + mOffsets[TYPE_NORMAL]);
glVertexAttribPointer(loc, 3, GL_FLOAT, GL_FALSE, LLVertexBuffer::sTypeSize[TYPE_NORMAL], ptr);
}
if (data_mask & MAP_TEXCOORD3)
if (setup_mask & MAP_TEXCOORD3)
{
AttributeType loc = TYPE_TEXCOORD3;
void* ptr = (void*)(base + mOffsets[TYPE_TEXCOORD3]);
glVertexAttribPointer(loc, 2, GL_FLOAT, GL_FALSE, LLVertexBuffer::sTypeSize[TYPE_TEXCOORD3], ptr);
}
if (data_mask & MAP_TEXCOORD2)
if (setup_mask & MAP_TEXCOORD2)
{
AttributeType loc = TYPE_TEXCOORD2;
void* ptr = (void*)(base + mOffsets[TYPE_TEXCOORD2]);
glVertexAttribPointer(loc, 2, GL_FLOAT, GL_FALSE, LLVertexBuffer::sTypeSize[TYPE_TEXCOORD2], ptr);
}
if (data_mask & MAP_TEXCOORD1)
if (setup_mask & MAP_TEXCOORD1)
{
AttributeType loc = TYPE_TEXCOORD1;
void* ptr = (void*)(base + mOffsets[TYPE_TEXCOORD1]);
glVertexAttribPointer(loc, 2, GL_FLOAT, GL_FALSE, LLVertexBuffer::sTypeSize[TYPE_TEXCOORD1], ptr);
}
if (data_mask & MAP_TANGENT)
if (setup_mask & MAP_TANGENT)
{
AttributeType loc = TYPE_TANGENT;
void* ptr = (void*)(base + mOffsets[TYPE_TANGENT]);
glVertexAttribPointer(loc, 4, GL_FLOAT, GL_FALSE, LLVertexBuffer::sTypeSize[TYPE_TANGENT], ptr);
}
if (data_mask & MAP_TEXCOORD0)
if (setup_mask & MAP_TEXCOORD0)
{
AttributeType loc = TYPE_TEXCOORD0;
void* ptr = (void*)(base + mOffsets[TYPE_TEXCOORD0]);
glVertexAttribPointer(loc, 2, GL_FLOAT, GL_FALSE, LLVertexBuffer::sTypeSize[TYPE_TEXCOORD0], ptr);
}
if (data_mask & MAP_COLOR)
const U32 desired_color_source = (data_mask & MAP_EMISSIVE) ?
COLOR_POINTER_EMISSIVE :
((data_mask & MAP_COLOR) ? COLOR_POINTER_COLOR : 0);
if (desired_color_source &&
(!gGLManager.mIsApple || desired_color_source != sColorPointerSource))
{
AttributeType loc = TYPE_COLOR;
//bind emissive instead of color pointer if emissive is present
void* ptr = (data_mask & MAP_EMISSIVE) ? (void*)(base + mOffsets[TYPE_EMISSIVE]) : (void*)(base + mOffsets[TYPE_COLOR]);
void* ptr = desired_color_source == COLOR_POINTER_EMISSIVE ?
(void*)(base + mOffsets[TYPE_EMISSIVE]) :
(void*)(base + mOffsets[TYPE_COLOR]);
glVertexAttribPointer(loc, 4, GL_UNSIGNED_BYTE, GL_TRUE, LLVertexBuffer::sTypeSize[TYPE_COLOR], ptr);
sColorPointerSource = desired_color_source;
}
if (data_mask & MAP_EMISSIVE)
if (setup_mask & MAP_EMISSIVE)
{
AttributeType loc = TYPE_EMISSIVE;
void* ptr = (void*)(base + mOffsets[TYPE_EMISSIVE]);
glVertexAttribPointer(loc, 4, GL_UNSIGNED_BYTE, GL_TRUE, LLVertexBuffer::sTypeSize[TYPE_EMISSIVE], ptr);

if (!(data_mask & MAP_COLOR))
{ //map emissive to color channel when color is not also being bound to avoid unnecessary shader swaps
loc = TYPE_COLOR;
glVertexAttribPointer(loc, 4, GL_UNSIGNED_BYTE, GL_TRUE, LLVertexBuffer::sTypeSize[TYPE_EMISSIVE], ptr);
}
}
if (data_mask & MAP_WEIGHT)
if (setup_mask & MAP_WEIGHT)
{
AttributeType loc = TYPE_WEIGHT;
void* ptr = (void*)(base + mOffsets[TYPE_WEIGHT]);
glVertexAttribPointer(loc, 1, GL_FLOAT, GL_FALSE, LLVertexBuffer::sTypeSize[TYPE_WEIGHT], ptr);
}
if (data_mask & MAP_WEIGHT4)
if (setup_mask & MAP_WEIGHT4)
{
AttributeType loc = TYPE_WEIGHT4;
void* ptr = (void*)(base + mOffsets[TYPE_WEIGHT4]);
glVertexAttribPointer(loc, 4, GL_FLOAT, GL_FALSE, LLVertexBuffer::sTypeSize[TYPE_WEIGHT4], ptr);
}
if (data_mask & MAP_JOINT)
if (setup_mask & MAP_JOINT)
{
AttributeType loc = TYPE_JOINT;
void* ptr = (void*)(base + mOffsets[TYPE_JOINT]);
glVertexAttribIPointer(loc, 4, GL_UNSIGNED_SHORT, LLVertexBuffer::sTypeSize[TYPE_JOINT], ptr);
}
if (data_mask & MAP_CLOTHWEIGHT)
if (setup_mask & MAP_CLOTHWEIGHT)
{
AttributeType loc = TYPE_CLOTHWEIGHT;
void* ptr = (void*)(base + mOffsets[TYPE_CLOTHWEIGHT]);
glVertexAttribPointer(loc, 4, GL_FLOAT, GL_TRUE, LLVertexBuffer::sTypeSize[TYPE_CLOTHWEIGHT], ptr);
}
if (data_mask & MAP_TEXTURE_INDEX)
if (setup_mask & MAP_TEXTURE_INDEX)
{
AttributeType loc = TYPE_TEXTURE_INDEX;
void* ptr = (void*)(base + mOffsets[TYPE_VERTEX] + 12);
glVertexAttribIPointer(loc, 1, GL_UNSIGNED_INT, LLVertexBuffer::sTypeSize[TYPE_VERTEX], ptr);
}
if (data_mask & MAP_VERTEX)
if (setup_mask & MAP_VERTEX)
{
AttributeType loc = TYPE_VERTEX;
void* ptr = (void*)(base + mOffsets[TYPE_VERTEX]);
glVertexAttribPointer(loc, 3, GL_FLOAT, GL_FALSE, LLVertexBuffer::sTypeSize[TYPE_VERTEX], ptr);
}
if (gGLManager.mIsApple)
{
sVertexAttribsConfigured |= data_mask;
if (desired_color_source)
{
sVertexAttribsConfigured |= MAP_COLOR;
}
}
STOP_GLERROR;
}

Expand Down Expand Up @@ -1924,4 +1949,3 @@ void LLVertexBuffer::setIndexData(const U32* data, U32 offset, U32 count)




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