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glsl: Parameterize asin_expr() on the fit coefficients.

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This will allow us to share the implementation while using different
polynomials for asin() and acos().

Francisco Jerez did this in the SPIR-V front-end; I'm merely porting
his idea to the GLSL world.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
This commit is contained in:
Kenneth Graunke
2016-03-02 23:39:18 -08:00
parent aa37cbdff7
commit 2795fbcae3
1 changed files with 6 additions and 6 deletions
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12
src/compiler/glsl/builtin_functions.cpp
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@@ -578,7 +578,7 @@ private:
ir_dereference_array *array_ref(ir_variable *var, int i);
ir_swizzle *matrix_elt(ir_variable *var, int col, int row);
ir_expression *asin_expr(ir_variable *x);
ir_expression *asin_expr(ir_variable *x, float p0, float p1);
void do_atan(ir_factory &body, const glsl_type *type, ir_variable *res, operand y_over_x);
/**
@@ -3212,7 +3212,7 @@ builtin_builder::_tan(const glsl_type *type)
}
ir_expression *
builtin_builder::asin_expr(ir_variable *x)
builtin_builder::asin_expr(ir_variable *x, float p0, float p1)
{
return mul(sign(x),
sub(imm(M_PI_2f),
@@ -3221,8 +3221,8 @@ builtin_builder::asin_expr(ir_variable *x)
mul(abs(x),
add(imm(M_PI_4f - 1.0f),
mul(abs(x),
add(imm(0.086566724f),
mul(abs(x), imm(-0.03102955f))))))))));
add(imm(p0),
mul(abs(x), imm(p1))))))))));
}
ir_call *
@@ -3251,7 +3251,7 @@ builtin_builder::_asin(const glsl_type *type)
ir_variable *x = in_var(type, "x");
MAKE_SIG(type, always_available, 1, x);
body.emit(ret(asin_expr(x)));
body.emit(ret(asin_expr(x, 0.086566724f, -0.03102955f)));
return sig;
}
@@ -3262,7 +3262,7 @@ builtin_builder::_acos(const glsl_type *type)
ir_variable *x = in_var(type, "x");
MAKE_SIG(type, always_available, 1, x);
body.emit(ret(sub(imm(M_PI_2f), asin_expr(x))));
body.emit(ret(sub(imm(M_PI_2f), asin_expr(x, 0.086566724f, -0.03102955f))));
return sig;
}