[PATCH 5/5] d3dcompiler: Implement basic expressions parsing.
stefandoesinger at gmx.at
Tue Jul 17 06:03:59 CDT 2012
Am Montag, 16. Juli 2012, 20:39:23 schrieb Matteo Bruni:
> + HLSL_IR_BINOP_MUL,
> + HLSL_IR_BINOP_DOT,
HLSL has 3 somewhat related multiplication operations: "*", "mul" and "dot".
Dot is fairly straightforward, but "*" and "mul" have subtle differences. I
recommend to write tests to find out the exact details, but as far as I
remember "float4 * float4" gives you a float4 with a component-wise
multiplication, whereas mul(float, float) returns a scalar like the dot
product. "float4x4 * float4" is an error, but mul(float4x4, float4) performs a
matrix-vector multiplication and returns a float4.
> +static struct hlsl_type *expr_common_type(struct hlsl_type *t1, struct
> hlsl_type *t2,
> + struct source_location *loc)
This type inference system might be a bit too limited, you have to take the
operation into account. e.g. a dot(float3, float4) returns a scalar and
crs(float4, float4) returns a float3.
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