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 Index > Windows > Parse mathematically c++ example to asm sse code.
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Roman

Joined: 21 Apr 2012
Posts: 1379
Roman 19 Jan 2019, 11:40
My idea write parser c++ math formuls.
This gives easy copy c++ code and read code.

For example(very simple example).
Code:
float A = 2.1;
float B = 3;
vec3 C = A*B;

Parser understood float\int\vec2\vec3\vec4 and matrix3(3x3) and matrix4(4x4)
Parser get asm sse text code in output file(and we easy include this file in fasm source):
Code:
movss xmm0,[pA]
mulss xmm0,[pB]
pinsrd xmm1, xmm0, 0
pinsrd xmm1, xmm0, 1
pinsrd xmm1, xmm0, 2
;now in xmm1 we have vec3

In future very useful\handful for this:
Code:
Vec3 v0v1 = (v1- v0);
Vec3 v0v2 = (v2- v0);

Vec3 pvec = cross (r->dir, v0v2);

float det = dot (v0v1, pvec);
if (det < 0.000001) return -INFINITY;

float invDet = 1.0 / det;

Vec3 tvec = sub (r->orig, v0);

float u = dot (tvec, pvec) * invDet;

if (u < -0.0001 || u > 1.0001) return -INFINITY;

Vec3 qvec = cross (tvec, v0v1);

float v = dot (r->dir, qvec) * invDet;

if (v < -0.0001 || u + v > 1.0001) return -INFINITY;

return dot (v0v2, qvec) * invDet;

19 Jan 2019, 11:40
DimonSoft

Joined: 03 Mar 2010
Posts: 1203
Location: Belarus
DimonSoft 19 Jan 2019, 14:05
Shaders have this stuff and are often written in something similar to C/C++ syntax. D3DX library already has certain formula like these implemented as well. Note also that SSE is not very useful for calculations applied to a few values, it is supposed to be used for large arrays of data (for certain definitions of “large”) to be useful.
19 Jan 2019, 14:05
Roman

Joined: 21 Apr 2012
Posts: 1379
Roman 20 Jan 2019, 09:11
Shaders cool.
But sometimes need do function on CPU.
20 Jan 2019, 09:11
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