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i965/fs: Factor out texture offset bitfield computation.

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We'll want to reuse this for the VS, and it's complex enough that I'd
rather not cut and paste it.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Kenneth Graunke 2011-10-26 13:51:28 -07:00
parent d93aa54d2d
commit 475d70d6ef
3 changed files with 26 additions and 18 deletions
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19
src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
View file

@ -1077,24 +1077,7 @@ fs_visitor::visit(ir_texture *ir)
fs_reg coordinate = this->result;
if (ir->offset != NULL) {
ir_constant *offset = ir->offset->as_constant();
assert(offset != NULL);
signed char offsets[3];
for (unsigned i = 0; i < ir->offset->type->vector_elements; i++)
offsets[i] = (signed char) offset->value.i[i];
/* Combine all three offsets into a single unsigned dword:
*
* bits 11:8 - U Offset (X component)
* bits 7:4 - V Offset (Y component)
* bits 3:0 - R Offset (Z component)
*/
unsigned offset_bits = 0;
for (unsigned i = 0; i < ir->offset->type->vector_elements; i++) {
const unsigned shift = 4 * (2 - i);
offset_bits |= (offsets[i] << shift) & (0xF << shift);
}
uint32_t offset_bits = brw_texture_offset(ir->offset->as_constant());
/* Explicitly set up the message header by copying g0 to msg reg m1. */
emit(BRW_OPCODE_MOV, fs_reg(MRF, 1, BRW_REGISTER_TYPE_UD),

23
src/mesa/drivers/dri/i965/brw_shader.cpp
View file

@ -239,3 +239,26 @@ brw_math_function(enum opcode op)
return 0;
}
}
uint32_t
brw_texture_offset(ir_constant *offset)
{
assert(offset != NULL);
signed char offsets[3];
for (unsigned i = 0; i < offset->type->vector_elements; i++)
offsets[i] = (signed char) offset->value.i[i];
/* Combine all three offsets into a single unsigned dword:
*
* bits 11:8 - U Offset (X component)
* bits 7:4 - V Offset (Y component)
* bits 3:0 - R Offset (Z component)
*/
unsigned offset_bits = 0;
for (unsigned i = 0; i < offset->type->vector_elements; i++) {
const unsigned shift = 4 * (2 - i);
offset_bits |= (offsets[i] << shift) & (0xF << shift);
}
return offset_bits;
}

2
src/mesa/drivers/dri/i965/brw_shader.h
View file

@ -23,9 +23,11 @@
#include <stdint.h>
#include "brw_defines.h"
#include "glsl/ir.h"
#pragma once
int brw_type_for_base_type(const struct glsl_type *type);
uint32_t brw_conditional_for_comparison(unsigned int op);
uint32_t brw_math_function(enum opcode op);
uint32_t brw_texture_offset(ir_constant *offset);