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Avoid redundant GL calls to glEnableVertexAttribArray() and glDisableVertexAttribArray(). #1960

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This commit is contained in:
Jukka Jylänki
2020-03-17 17:01:26 +02:00
committed by Бранимир Караџић
parent be626359f9
commit bab9dc752e
2 changed files with 72 additions and 5 deletions
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72
src/renderer_gl.cpp
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@@ -1175,6 +1175,69 @@ namespace bgfx { namespace gl
return 0 == err ? result : 0;
}
static uint64_t currentlyEnabledVertexAttribArrays = 0;
static uint64_t vertexAttribArraysPendingDisable = 0;
static uint64_t vertexAttribArraysPendingEnable = 0;
void lazyEnableVertexAttribArray(GLuint index)
{
#if BX_PLATFORM_EMSCRIPTEN
// On WebGL platform calling out to WebGL API is detrimental to performance, so optimize
// out redundant API calls to glEnable/DisableVertexAttribArray.
if (index >= 64)
{
glEnableVertexAttribArray(index);
return;
}
uint64_t mask = 1ULL << index;
vertexAttribArraysPendingEnable |= mask & (~currentlyEnabledVertexAttribArrays);
vertexAttribArraysPendingDisable &= ~mask;
#else
glEnableVertexAttribArray(index);
#endif
}
void lazyDisableVertexAttribArray(GLuint index)
{
#if BX_PLATFORM_EMSCRIPTEN
// On WebGL platform calling out to WebGL API is detrimental to performance, so optimize
// out redundant API calls to glEnable/DisableVertexAttribArray.
if (index >= 64)
{
glDisableVertexAttribArray(index);
return;
}
uint64_t mask = 1ULL << index;
vertexAttribArraysPendingDisable |= mask & currentlyEnabledVertexAttribArrays;
vertexAttribArraysPendingEnable &= ~mask;
#else
glDisableVertexAttribArray(index);
#endif
}
void applyLazyEnabledVertexAttributes()
{
#if BX_PLATFORM_EMSCRIPTEN
while(vertexAttribArraysPendingDisable)
{
int index = __builtin_ctzll(vertexAttribArraysPendingDisable);
uint64_t mask = ~(1ULL << index);
vertexAttribArraysPendingDisable &= mask;
currentlyEnabledVertexAttribArrays &= mask;
glDisableVertexAttribArray(index);
}
while(vertexAttribArraysPendingEnable)
{
int index = __builtin_ctzll(vertexAttribArraysPendingEnable);
uint64_t mask = 1ULL << index;
vertexAttribArraysPendingEnable &= ~mask;
currentlyEnabledVertexAttribArrays |= mask;
glEnableVertexAttribArray(index);
}
#endif
}
void setTextureFormat(TextureFormat::Enum _format, GLenum _internalFmt, GLenum _fmt, GLenum _type = GL_ZERO)
{
TextureFormatInfo& tfi = s_textureFormat[_format];
@@ -4570,7 +4633,7 @@ namespace bgfx { namespace gl
{
if (UINT16_MAX != _layout.m_attributes[attr])
{
GL_CHECK(glEnableVertexAttribArray(loc) );
GL_CHECK(lazyEnableVertexAttribArray(loc) );
GL_CHECK(glVertexAttribDivisor(loc, 0) );
uint32_t baseVertex = _baseVertex*_layout.m_stride + _layout.m_offset[attr];
@@ -4600,6 +4663,7 @@ namespace bgfx { namespace gl
}
}
}
applyLazyEnabledVertexAttributes();
}
void ProgramGL::unbindAttributes()
@@ -4610,7 +4674,7 @@ namespace bgfx { namespace gl
{
Attrib::Enum attr = Attrib::Enum(m_used[ii]);
GLint loc = m_attributes[attr];
GL_CHECK(glDisableVertexAttribArray(loc));
GL_CHECK(lazyDisableVertexAttribArray(loc));
}
}
}
@@ -4621,7 +4685,7 @@ namespace bgfx { namespace gl
for (uint32_t ii = 0; 0xffff != m_instanceData[ii]; ++ii)
{
GLint loc = m_instanceData[ii];
GL_CHECK(glEnableVertexAttribArray(loc) );
GL_CHECK(lazyEnableVertexAttribArray(loc) );
GL_CHECK(glVertexAttribPointer(loc, 4, GL_FLOAT, GL_FALSE, _stride, (void*)(uintptr_t)baseVertex) );
GL_CHECK(glVertexAttribDivisor(loc, 1) );
baseVertex += 16;
@@ -4633,7 +4697,7 @@ namespace bgfx { namespace gl
for(uint32_t ii = 0; 0xffff != m_instanceData[ii]; ++ii)
{
GLint loc = m_instanceData[ii];
GL_CHECK(glDisableVertexAttribArray(loc));
GL_CHECK(lazyDisableVertexAttribArray(loc));
}
}