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Use glMultiDrawArrays instead of glDrawArrays, which significantly

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reduces the number of OpenGL calls for large sets of triangle strips; 
this is something like a 10% perf improvement in the case I'm looking 
at.



git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@2120 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
magumagu9 2009-02-06 03:41:33 +00:00
parent 7cc80c32f9
commit 90c9810b85
1 changed files with 30 additions and 14 deletions
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44
Source/Plugins/Plugin_VideoOGL/Src/VertexManager.cpp
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@ -30,7 +30,10 @@ namespace VertexManager
static GLuint s_vboBuffers[0x40] = {0};
static int s_nCurVBOIndex = 0; // current free buffer
static u8 *s_pBaseBufferPointer = NULL;
static std::vector< std::pair<u32, u32> > s_vStoredPrimitives; // every element, mode and count to be passed to glDrawArrays
static std::vector< GLint > s_vertexFirstOffset;
static std::vector< GLsizei > s_vertexGroupSize;
static std::vector< std::pair< GLenum, int > > s_vertexGroups;
u32 s_vertexCount;
static const GLenum c_primitiveType[8] =
{
@ -58,7 +61,6 @@ bool Init()
glEnableClientState(GL_VERTEX_ARRAY);
g_nativeVertexFmt = NULL;
s_vStoredPrimitives.reserve(1000);
GL_REPORT_ERRORD();
return true;
@ -70,7 +72,10 @@ void Shutdown()
glDeleteBuffers(ARRAYSIZE(s_vboBuffers), s_vboBuffers);
memset(s_vboBuffers, 0, sizeof(s_vboBuffers));
s_vStoredPrimitives.resize(0);
s_vertexFirstOffset.resize(0);
s_vertexGroupSize.resize(0);
s_vertexGroups.resize(0);
s_vertexCount = 0;
s_nCurVBOIndex = 0;
ResetBuffer();
}
@ -79,7 +84,10 @@ void ResetBuffer()
{
s_nCurVBOIndex = (s_nCurVBOIndex + 1) % ARRAYSIZE(s_vboBuffers);
s_pCurBufferPointer = s_pBaseBufferPointer;
s_vStoredPrimitives.resize(0);
s_vertexFirstOffset.resize(0);
s_vertexGroupSize.resize(0);
s_vertexGroups.resize(0);
s_vertexCount = 0;
}
int GetRemainingSize()
@ -93,7 +101,7 @@ void AddVertices(int primitive, int numvertices)
_assert_(g_nativeVertexFmt != NULL);
ADDSTAT(stats.thisFrame.numPrims, numvertices);
if (s_vStoredPrimitives.size() && s_vStoredPrimitives[s_vStoredPrimitives.size() - 1].first == c_primitiveType[primitive]) {
if (!s_vertexGroups.empty() && s_vertexGroups.back().first == c_primitiveType[primitive]) {
// We can join primitives for free here. Not likely to help much, though, but whatever...
if (c_primitiveType[primitive] == GL_TRIANGLES ||
c_primitiveType[primitive] == GL_LINES ||
@ -101,14 +109,19 @@ void AddVertices(int primitive, int numvertices)
c_primitiveType[primitive] == GL_QUADS) {
INCSTAT(stats.thisFrame.numPrimitiveJoins);
// Easy join
std::pair<u32, u32> &last_pair = s_vStoredPrimitives[s_vStoredPrimitives.size() - 1];
last_pair.second += numvertices;
s_vertexGroupSize.back() += numvertices;
s_vertexCount += numvertices;
return;
}
// Joining strips is a lot more work but would bring more gain. Not sure if it's worth it though.
}
s_vStoredPrimitives.push_back(std::pair<int, int>(c_primitiveType[primitive], numvertices));
s_vertexFirstOffset.push_back(s_vertexCount);
s_vertexGroupSize.push_back(numvertices);
s_vertexCount += numvertices;
if (!s_vertexGroups.empty() && s_vertexGroups.back().first == c_primitiveType[primitive])
s_vertexGroups.back().second++;
else
s_vertexGroups.push_back(std::make_pair(c_primitiveType[primitive], 1));
#if defined(_DEBUG) || defined(DEBUGFAST)
static const char *sprims[8] = {"quads", "nothing", "tris", "tstrip", "tfan", "lines", "lstrip", "points"};
@ -118,7 +131,7 @@ void AddVertices(int primitive, int numvertices)
void Flush()
{
if (s_vStoredPrimitives.size() == 0)
if (s_vertexCount == 0)
return;
_assert_(s_pCurBufferPointer != s_pBaseBufferPointer);
@ -260,12 +273,15 @@ void Flush()
PRIM_LOG("\n");
#endif
int offset = 0;
for (std::vector< std::pair<u32, u32> >::const_iterator it = s_vStoredPrimitives.begin(); it != s_vStoredPrimitives.end(); ++it)
int groupStart = 0;
for (unsigned i = 0; i < s_vertexGroups.size(); i++)
{
INCSTAT(stats.thisFrame.numDrawCalls);
glDrawArrays(it->first, offset, it->second);
offset += it->second;
glMultiDrawArrays(s_vertexGroups[i].first,
&s_vertexFirstOffset[groupStart],
&s_vertexGroupSize[groupStart],
s_vertexGroups[i].second);
groupStart += s_vertexGroups[i].second;
}
#if defined(_DEBUG) || defined(DEBUGFAST)