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vkd3d-shader/ir: Implement exponential fog.

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This commit is contained in:
Elizabeth Figura
2024-11-13 19:39:35 -06:00
committed by Henri Verbeet
parent 1fbbc82f3a
commit d56601c8d0
Notes: Henri Verbeet 2024-12-02 17:19:05 +01:00 
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1265
7 changed files with 142 additions and 11 deletions
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67
libs/vkd3d-shader/ir.c
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@@ -6764,7 +6764,7 @@ static enum vkd3d_result insert_fragment_fog_before_ret(struct vsir_program *pro
uint32_t ssa_factor = program->ssa_count++;
size_t pos = ret - instructions->elements;
struct vkd3d_shader_instruction *ins;
uint32_t ssa_temp;
uint32_t ssa_temp, ssa_temp2;
switch (mode)
{
@@ -6798,6 +6798,71 @@ static enum vkd3d_result insert_fragment_fog_before_ret(struct vsir_program *pro
src_param_init_parameter(&ins->src[1], VKD3D_SHADER_PARAMETER_NAME_FOG_SCALE, VKD3D_DATA_FLOAT);
break;
case VKD3D_SHADER_FOG_FRAGMENT_EXP:
/* We generate the following code:
*
* mul sr0, FOG_SCALE, vFOG.x
* exp_sat srFACTOR, -sr0
*/
if (!shader_instruction_array_insert_at(&program->instructions, pos, 4))
return VKD3D_ERROR_OUT_OF_MEMORY;
*ret_pos = pos + 4;
ssa_temp = program->ssa_count++;
ins = &program->instructions.elements[pos];
vsir_instruction_init_with_params(program, ins, &loc, VKD3DSIH_MUL, 1, 2);
dst_param_init_ssa_float(&ins->dst[0], ssa_temp);
src_param_init_parameter(&ins->src[0], VKD3D_SHADER_PARAMETER_NAME_FOG_SCALE, VKD3D_DATA_FLOAT);
vsir_src_param_init(&ins->src[1], VKD3DSPR_INPUT, VKD3D_DATA_FLOAT, 1);
ins->src[1].reg.idx[0].offset = fog_signature_idx;
ins->src[1].reg.dimension = VSIR_DIMENSION_VEC4;
ins->src[1].swizzle = VKD3D_SHADER_SWIZZLE(X, X, X, X);
vsir_instruction_init_with_params(program, ++ins, &loc, VKD3DSIH_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;
break;
case VKD3D_SHADER_FOG_FRAGMENT_EXP2:
/* We generate the following code:
*
* mul sr0, FOG_SCALE, vFOG.x
* mul sr1, sr0, sr0
* exp_sat srFACTOR, -sr1
*/
if (!shader_instruction_array_insert_at(&program->instructions, pos, 5))
return VKD3D_ERROR_OUT_OF_MEMORY;
*ret_pos = pos + 5;
ssa_temp = program->ssa_count++;
ssa_temp2 = program->ssa_count++;
ins = &program->instructions.elements[pos];
vsir_instruction_init_with_params(program, ins, &loc, VKD3DSIH_MUL, 1, 2);
dst_param_init_ssa_float(&ins->dst[0], ssa_temp);
src_param_init_parameter(&ins->src[0], VKD3D_SHADER_PARAMETER_NAME_FOG_SCALE, VKD3D_DATA_FLOAT);
vsir_src_param_init(&ins->src[1], VKD3DSPR_INPUT, VKD3D_DATA_FLOAT, 1);
ins->src[1].reg.idx[0].offset = fog_signature_idx;
ins->src[1].reg.dimension = VSIR_DIMENSION_VEC4;
ins->src[1].swizzle = VKD3D_SHADER_SWIZZLE(X, X, X, X);
vsir_instruction_init_with_params(program, ++ins, &loc, VKD3DSIH_MUL, 1, 2);
dst_param_init_ssa_float(&ins->dst[0], ssa_temp2);
src_param_init_ssa_float(&ins->src[0], ssa_temp);
src_param_init_ssa_float(&ins->src[1], ssa_temp);
vsir_instruction_init_with_params(program, ++ins, &loc, VKD3DSIH_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_temp2);
ins->src[0].modifiers = VKD3DSPSM_NEG;
break;
default:
vkd3d_unreachable();
}