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vkd3d-shader/ir: Use VSIR_OP_NEG in insert_fragment_fog_before_ret(), in the exponential case.

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This commit is contained in:
Giovanni Mascellani
2025-10-08 22:58:52 +02:00
committed by Henri Verbeet
parent 786ffe69f7
commit b2d47693b4
Notes: Henri Verbeet 2025-10-13 19:32:46 +02:00 
Approved-by: Francisco Casas (@fcasas)
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1783
1 changed files with 10 additions and 4 deletions
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14
libs/vkd3d-shader/ir.c
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@@ -8329,12 +8329,14 @@ static enum vkd3d_result insert_fragment_fog_before_ret(struct vsir_program *pro
/* We generate the following code:
*
* mul sr0, FOG_SCALE, vFOG.x
* exp_sat srFACTOR, -sr0
* neg sr1, sr0
* exp_sat srFACTOR, sr1
*/
if (!(ins = vsir_program_iterator_insert_before_and_move(it, 4)))
if (!(ins = vsir_program_iterator_insert_before_and_move(it, 5)))
return VKD3D_ERROR_OUT_OF_MEMORY;
ssa_temp = program->ssa_count++;
ssa_temp2 = program->ssa_count++;
vsir_instruction_init_with_params(program, ins, &loc, VSIR_OP_MUL, 1, 2);
dst_param_init_ssa_float(&ins->dst[0], ssa_temp);
@@ -8345,11 +8347,15 @@ static enum vkd3d_result insert_fragment_fog_before_ret(struct vsir_program *pro
ins->src[1].swizzle = VKD3D_SHADER_SWIZZLE(X, X, X, X);
ins = vsir_program_iterator_next(it);
vsir_instruction_init_with_params(program, ins, &loc, VSIR_OP_NEG, 1, 1);
dst_param_init_ssa_float(&ins->dst[0], ssa_temp2);
src_param_init_ssa_float(&ins->src[0], ssa_temp);
ins = vsir_program_iterator_next(it);
vsir_instruction_init_with_params(program, ins, &loc, VSIR_OP_EXP, 1, 1);
dst_param_init_ssa_float(&ins->dst[0], ssa_factor);
ins->dst[0].modifiers = VKD3DSPDM_SATURATE;
src_param_init_ssa_float(&ins->src[0], ssa_temp);
ins->src[0].modifiers = VKD3DSPSM_NEG;
src_param_init_ssa_float(&ins->src[0], ssa_temp2);
ins = vsir_program_iterator_next(it);
break;