Yes: I'm working on 7.3 sources, and looking at prog_execute.c mesa_execute_program() under OPCODE_TEX/TXB/TXD.
My claim was too broad though, I am wondering very specifically about the use of the inst->TexSrcUnit field. In OPCODE_TXB it is used directly as an index into the ctx->Texture.Unit array (for the purpose of fetchig the LOD bias), but in fetch_texel() we have "unit = machine->Samplers[inst->TexSrcUnit]" that is, there is an indirect mapping between the instruciton field and the actual texture unit index. On Mon, Mar 30, 2009 at 5:32 PM, Brian Paul <[email protected]> wrote: > Shachar Kaufman wrote: > > Hi all, > > > > I noticed shader texture access, when done from TEX instructions, takes > > the TexSrcUnit instruction field into the program's Samplers map to find > > the intended texture unit. When done through TXB or TXD instructions > > this mapping with Samplers does not take place. > > > > Is this on purpose? > > Can you be more specific about where you're seeing this in the code? > > Thanks. > > -Brian > >
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