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tgsi: More comments on source register indirect and 2D indexing.

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This commit is contained in:
Michal Krol 2008-11-12 23:23:49 +01:00
parent 44257a8e75
commit 26c8593093
2 changed files with 65 additions and 10 deletions
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65
src/gallium/auxiliary/tgsi/tgsi_exec.c
View file

@ -1037,11 +1037,28 @@ fetch_source(
union tgsi_exec_channel index;
uint swizzle;
/* We start with a direct index into a register file.
*
* file[1],
* where:
* file = SrcRegister.File
* [1] = SrcRegister.Index
*/
index.i[0] =
index.i[1] =
index.i[2] =
index.i[3] = reg->SrcRegister.Index;
/* There is an extra source register that indirectly subscripts
* a register file. The direct index now becomes an offset
* that is being added to the indirect register.
*
* file[ind[2].x+1],
* where:
* ind = SrcRegisterInd.File
* [2] = SrcRegisterInd.Index
* .x = SrcRegisterInd.SwizzleX
*/
if (reg->SrcRegister.Indirect) {
union tgsi_exec_channel index2;
union tgsi_exec_channel indir_index;
@ -1078,19 +1095,31 @@ fetch_source(
}
}
if( reg->SrcRegister.Dimension ) {
switch( reg->SrcRegister.File ) {
/* There is an extra source register that is a second
* subscript to a register file. Effectively it means that
* the register file is actually a 2D array of registers.
*
* file[1][3] == file[1*sizeof(file[1])+3],
* where:
* [3] = SrcRegisterDim.Index
*/
if (reg->SrcRegister.Dimension) {
/* The size of the first-order array depends on the register file type.
* We need to multiply the index to the first array to get an effective,
* "flat" index that points to the beginning of the second-order array.
*/
switch (reg->SrcRegister.File) {
case TGSI_FILE_INPUT:
index.i[0] *= 17;
index.i[1] *= 17;
index.i[2] *= 17;
index.i[3] *= 17;
index.i[0] *= TGSI_EXEC_MAX_INPUT_ATTRIBS;
index.i[1] *= TGSI_EXEC_MAX_INPUT_ATTRIBS;
index.i[2] *= TGSI_EXEC_MAX_INPUT_ATTRIBS;
index.i[3] *= TGSI_EXEC_MAX_INPUT_ATTRIBS;
break;
case TGSI_FILE_CONSTANT:
index.i[0] *= 4096;
index.i[1] *= 4096;
index.i[2] *= 4096;
index.i[3] *= 4096;
index.i[0] *= TGSI_EXEC_MAX_CONST_BUFFER;
index.i[1] *= TGSI_EXEC_MAX_CONST_BUFFER;
index.i[2] *= TGSI_EXEC_MAX_CONST_BUFFER;
index.i[3] *= TGSI_EXEC_MAX_CONST_BUFFER;
break;
default:
assert( 0 );
@ -1101,6 +1130,17 @@ fetch_source(
index.i[2] += reg->SrcRegisterDim.Index;
index.i[3] += reg->SrcRegisterDim.Index;
/* Again, the second subscript index can be addressed indirectly
* identically to the first one.
* Nothing stops us from indirectly addressing the indirect register,
* but there is no need for that, so we won't exercise it.
*
* file[1][ind[4].y+3],
* where:
* ind = SrcRegisterDimInd.File
* [4] = SrcRegisterDimInd.Index
* .y = SrcRegisterDimInd.SwizzleX
*/
if (reg->SrcRegisterDim.Indirect) {
union tgsi_exec_channel index2;
union tgsi_exec_channel indir_index;
@ -1133,6 +1173,11 @@ fetch_source(
index.i[i] = 0;
}
}
/* If by any chance there was a need for a 3D array of register
* files, we would have to check whether SrcRegisterDim is followed
* by a dimension register and continue the saga.
*/
}
swizzle = tgsi_util_get_full_src_register_extswizzle( reg, chan_index );

10
src/gallium/auxiliary/tgsi/tgsi_exec.h
View file

@ -178,6 +178,16 @@ struct tgsi_exec_labels
#define TGSI_EXEC_MAX_LOOP_NESTING 20
#define TGSI_EXEC_MAX_CALL_NESTING 20
/* The maximum number of input attributes per vertex. For 2D
* input register files, this is the stride between two 1D
* arrays.
*/
#define TGSI_EXEC_MAX_INPUT_ATTRIBS 17
/* The maximum number of constant vectors per constant buffer.
*/
#define TGSI_EXEC_MAX_CONST_BUFFER 4096
/**
* Run-time virtual machine state for executing TGSI shader.
*/