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glsl: Evaluate constant GLSL ES 3.00 pack/unpack expressions (v3)

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That is, evaluate constant expressions of the following functions:
  packSnorm2x16  unpackSnorm2x16
  packUnorm2x16  unpackUnorm2x16
  packHalf2x16   unpackHalf2x16

v2: Reuse _mesa_pack_float_to_half and its inverse to evaluate
    pack/unpackHalf2x16. [for idr]
v3: Whitespace fixes. [for mattst88]
    Don't cast neg floats directly to uint16; use an intermediate cast to
    int16. [for paul]

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> (v2)
Reviewed-by: Paul Berry <stereotype441@gmail.com>
Reviewed-by: Matt Tuner <mattst88@gmail.com>
Signed-off-by: Chad Versace <chad.versace@linux.intel.com>
This commit is contained in:
Chad Versace
2012-11-19 11:14:24 -08:00
parent 529b6d1f3d
commit 542c7a3022
1 changed files with 189 additions and 0 deletions
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189
src/glsl/ir_constant_expression.cpp
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@@ -75,6 +75,159 @@ bitcast_f2u(float f)
return u;
}
/**
* Evaluate one component of a floating-point 2x16 unpacking function.
*/
typedef uint16_t
(*pack_1x16_func_t)(float);
/**
* Evaluate one component of a floating-point 2x16 unpacking function.
*/
typedef float
(*unpack_1x16_func_t)(uint16_t);
/**
* Evaluate a 2x16 floating-point packing function.
*/
static uint32_t
pack_2x16(pack_1x16_func_t pack_1x16,
float x, float y)
{
/* From section 8.4 of the GLSL ES 3.00 spec:
*
* packSnorm2x16
* -------------
* The first component of the vector will be written to the least
* significant bits of the output; the last component will be written to
* the most significant bits.
*
* The specifications for the other packing functions contain similar
* language.
*/
uint32_t u = 0;
u |= ((uint32_t) pack_1x16(x) << 0);
u |= ((uint32_t) pack_1x16(y) << 16);
return u;
}
/**
* Evaluate a 2x16 floating-point unpacking function.
*/
static void
unpack_2x16(unpack_1x16_func_t unpack_1x16,
uint32_t u,
float *x, float *y)
{
/* From section 8.4 of the GLSL ES 3.00 spec:
*
* unpackSnorm2x16
* ---------------
* The first component of the returned vector will be extracted from
* the least significant bits of the input; the last component will be
* extracted from the most significant bits.
*
* The specifications for the other unpacking functions contain similar
* language.
*/
*x = unpack_1x16((uint16_t) (u & 0xffff));
*y = unpack_1x16((uint16_t) (u >> 16));
}
/**
* Evaluate one component of packSnorm2x16.
*/
static uint16_t
pack_snorm_1x16(float x)
{
/* From section 8.4 of the GLSL ES 3.00 spec:
*
* packSnorm2x16
* -------------
* The conversion for component c of v to fixed point is done as
* follows:
*
* packSnorm2x16: round(clamp(c, -1, +1) * 32767.0)
*
* We must first cast the float to an int, because casting a negative
* float to a uint is undefined.
*/
return (uint16_t) (int16_t)
_mesa_round_to_even(CLAMP(x, -1.0f, +1.0f) * 32767.0f);
}
/**
* Evaluate one component of unpackSnorm2x16.
*/
static float
unpack_snorm_1x16(uint16_t u)
{
/* From section 8.4 of the GLSL ES 3.00 spec:
*
* unpackSnorm2x16
* ---------------
* The conversion for unpacked fixed-point value f to floating point is
* done as follows:
*
* unpackSnorm2x16: clamp(f / 32767.0, -1, +1)
*/
return CLAMP((int16_t) u / 32767.0f, -1.0f, +1.0f);
}
/**
* Evaluate one component packUnorm2x16.
*/
static uint16_t
pack_unorm_1x16(float x)
{
/* From section 8.4 of the GLSL ES 3.00 spec:
*
* packUnorm2x16
* -------------
* The conversion for component c of v to fixed point is done as
* follows:
*
* packUnorm2x16: round(clamp(c, 0, +1) * 65535.0)
*/
return (uint16_t) _mesa_round_to_even(CLAMP(x, 0.0f, 1.0f) * 65535.0f);
}
/**
* Evaluate one component of unpackUnorm2x16.
*/
static float
unpack_unorm_1x16(uint16_t u)
{
/* From section 8.4 of the GLSL ES 3.00 spec:
*
* unpackUnorm2x16
* ---------------
* The conversion for unpacked fixed-point value f to floating point is
* done as follows:
*
* unpackUnorm2x16: f / 65535.0
*/
return (float) u / 65535.0f;
}
/**
* Evaluate one component of packHalf2x16.
*/
static uint16_t
pack_half_1x16(float x)
{
return _mesa_float_to_half(x);
}
/**
* Evaluate one component of unpackHalf2x16.
*/
static float
unpack_half_1x16(uint16_t u)
{
return _mesa_half_to_float(u);
}
ir_constant *
ir_rvalue::constant_expression_value(struct hash_table *variable_context)
{
@@ -440,6 +593,42 @@ ir_expression::constant_expression_value(struct hash_table *variable_context)
}
break;
case ir_unop_pack_snorm_2x16:
assert(op[0]->type == glsl_type::vec2_type);
data.u[0] = pack_2x16(pack_snorm_1x16,
op[0]->value.f[0],
op[0]->value.f[1]);
break;
case ir_unop_unpack_snorm_2x16:
assert(op[0]->type == glsl_type::uint_type);
unpack_2x16(unpack_snorm_1x16,
op[0]->value.u[0],
&data.f[0], &data.f[1]);
break;
case ir_unop_pack_unorm_2x16:
assert(op[0]->type == glsl_type::vec2_type);
data.u[0] = pack_2x16(pack_unorm_1x16,
op[0]->value.f[0],
op[0]->value.f[1]);
break;
case ir_unop_unpack_unorm_2x16:
assert(op[0]->type == glsl_type::uint_type);
unpack_2x16(unpack_unorm_1x16,
op[0]->value.u[0],
&data.f[0], &data.f[1]);
break;
case ir_unop_pack_half_2x16:
assert(op[0]->type == glsl_type::vec2_type);
data.u[0] = pack_2x16(pack_half_1x16,
op[0]->value.f[0],
op[0]->value.f[1]);
break;
case ir_unop_unpack_half_2x16:
assert(op[0]->type == glsl_type::uint_type);
unpack_2x16(unpack_half_1x16,
op[0]->value.u[0],
&data.f[0], &data.f[1]);
break;
case ir_binop_pow:
assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
for (unsigned c = 0; c < op[0]->type->components(); c++) {