# [Bug 49140] r600_state_common.c:761:r600_draw_vbo: Assertion `0' failed

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Apr 26 17:38:49 PDT 2012

```https://bugs.freedesktop.org/show_bug.cgi?id=49140

--- Comment #4 from Vadim <ptpzz at yandex.ru> 2012-04-26 17:38:49 PDT ---
Created attachment 60642
--> https://bugs.freedesktop.org/attachment.cgi?id=60642
lorentzTransform function

It seems you could replace the following lines in the lorentzTransform
function:

r.w = g*p.w - v.x*g*p.x - v.y*g*p.y - v.z*g*p.z;
r.x = -v.x*g*p.w + (1.0 + gm1*v.x*v.x/v2)*p.x + (gm1*v.x*v.y/v2)*p.y +
(gm1*v.x*v.z/v2)*p.z;
r.y = -v.y*g*p.w + (gm1*v.y*v.x/v2)*p.x + (1.0 + gm1*v.y*v.y/v2)*p.y +
(gm1*v.y*v.z/v2)*p.z,
r.z = -v.z*g*p.w + (gm1*v.z*v.x/v2)*p.x + (gm1*v.z*v.y/v2)*p.y +
(1.0+gm1*v.z*v.z/v2)*p.z;

with

vec3 p3 = vec3(p.x, p.y, p.z);
float t = dot(v, p3);
float t2 = gm1*t/v2 - g*p.w;
r = vec4( v*t2 + p3, g * (p.w - t));

Attachment contains the complete text of the modified function with the
separate steps of the transformation in the comments. Please check if all steps
are correct. Anyway, it shows the direction.

Original shader uses 130 regs, 1262 vliw alu instructions on my system.
Modified version - 81 reg, 778 instructions.

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