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nvfx: implement LIT in fp

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This commit is contained in:
Luca Barbieri 2010-09-03 22:06:41 +02:00
parent f061524f07
commit befc66788b
2 changed files with 24 additions and 1 deletions
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24
src/gallium/drivers/nvfx/nvfx_fragprog.c
View file

@ -1,3 +1,4 @@
#include <float.h>
#include "pipe/p_context.h"
#include "pipe/p_defines.h"
#include "pipe/p_state.h"
@ -629,7 +630,28 @@ nvfx_fragprog_parse_instruction(struct nvfx_context* nvfx, struct nvfx_fpc *fpc,
case TGSI_OPCODE_LG2:
nvfx_fp_emit(fpc, arith(sat, LG2, dst, mask, src[0], none, none));
break;
// case TGSI_OPCODE_LIT:
case TGSI_OPCODE_LIT:
if(!nvfx->is_nv4x)
nvfx_fp_emit(fpc, arith(sat, LIT_NV30, dst, mask, src[0], src[1], src[2]));
else {
/* we use FLT_MIN, so that log2 never gives -infinity, and thus multiplication by
* specular 0 always gives 0, so that ex2 gives 1, to satisfy the 0^0 = 1 requirement
*
* NOTE: if we start using half precision, we might need an fp16 FLT_MIN here instead
*/
float maxv[4] = {0, FLT_MIN, 0, 0};
struct nvfx_src maxs = nvfx_src(constant(fpc, -1, maxv));
tmp = nvfx_src(temp(fpc));
if (ci>= 0 || ii >= 0) {
nvfx_fp_emit(fpc, arith(0, MOV, tmp.reg, NVFX_FP_MASK_X | NVFX_FP_MASK_Y, maxs, none, none));
maxs = tmp;
}
nvfx_fp_emit(fpc, arith(0, MAX, tmp.reg, NVFX_FP_MASK_Y | NVFX_FP_MASK_W, swz(src[0], X, X, X, Y), swz(maxs, X, X, Y, Y), none));
nvfx_fp_emit(fpc, arith(0, LG2, tmp.reg, NVFX_FP_MASK_W, swz(tmp, W, W, W, W), none, none));
nvfx_fp_emit(fpc, arith(0, MUL, tmp.reg, NVFX_FP_MASK_W, swz(tmp, W, W, W, W), swz(src[0], W, W, W, W), none));
nvfx_fp_emit(fpc, arith(sat, LITEX2_NV40, dst, mask, swz(tmp, Y, Y, W, W), none, none));
}
break;
case TGSI_OPCODE_LRP:
if(!nvfx->is_nv4x)
nvfx_fp_emit(fpc, arith(sat, LRP_NV30, dst, mask, src[0], src[1], src[2]));

1
src/gallium/drivers/nvfx/nvfx_shader.h
View file

@ -263,6 +263,7 @@
/* NV40 only fragment program opcodes */
#define NVFX_FP_OP_OPCODE_TXL_NV40 0x2F
#define NVFX_FP_OP_OPCODE_LITEX2_NV40 0x3C
/* The use of these instructions appears to be indicated by bit 31 of DWORD 2.*/
#define NV40_FP_OP_BRA_OPCODE_BRK 0x0