I've done some more testing. It turned out that color data is copied
only when I enable blend transparency for quads. In other case
(per-vertex color modulated by texture, non-transparent) color data is
copied directly from same array as coordinates and texture coords.
With blending it looks like this
[00:00:08.863] glDisableClientState(GL_NORMAL_ARRAY)
[00:00:08.863] glEnableClientState(GL_COLOR_ARRAY)
[00:00:08.863] glEnableClientState(GL_VERTEX_ARRAY)
[00:00:08.863] glEnableClientState(GL_TEXTURE_COORD_ARRAY)
[00:00:08.863] glColorPointer(4,GL_FLOAT,0,0x293000C)
[00:00:08.863] glVertexPointer(3,GL_FLOAT,36,0x2C0F07C)
[00:00:08.863] wglGetProcAddress(glClientActiveTextureARB) = 0xB2601E0
[00:00:08.863] glEnableClientState(GL_TEXTURE_COORD_ARRAY)
[00:00:08.863] glTexCoordPointer(2,GL_FLOAT,36,0x2C0F064)
[00:00:08.863] glDrawArrays(GL_QUADS,0,4000)
(note different address for color pointer and vetrex/tex coord pointer).
Without blending:
[00:00:11.124] glDisableClientState(GL_NORMAL_ARRAY)
[00:00:11.124] glEnableClientState(GL_COLOR_ARRAY)
[00:00:11.124] glEnableClientState(GL_VERTEX_ARRAY)
[00:00:11.124] glEnableClientState(GL_TEXTURE_COORD_ARRAY)
[00:00:11.124] glColorPointer(4,GL_FLOAT,36,0x2C0EC0C)
[00:00:11.124] glVertexPointer(3,GL_FLOAT,36,0x2C0EC1C)
[00:00:11.124] wglGetProcAddress(glClientActiveTextureARB) = 0xB2601E0
[00:00:11.124] glEnableClientState(GL_TEXTURE_COORD_ARRAY)
[00:00:11.124] glTexCoordPointer(2,GL_FLOAT,36,0x2C0EC04)
[00:00:11.124] glDrawArrays(GL_QUADS,0,4000)
I also wonder why glEnableClientState(GL_TEXTURE_COORD_ARRAY) is called
twice, but this is certainly not a performance problem here (as opposed
to color mirror table creation which takes about 20-40% of entire
runtime).
Artur
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