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mesa: use memcmp instead of floating-point comparisons in glMultMatrixf

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This is faster.

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18828>
This commit is contained in:
Marek Olšák 2022-08-23 00:12:59 -04:00 • committed by Marge Bot
parent 01c481335a
commit 0b00a158ad
1 changed files with 9 additions and 5 deletions
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14
src/mesa/main/matrix.c
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@ -561,13 +561,17 @@ _mesa_MatrixLoadfEXT( GLenum matrixMode, const GLfloat *m )
static void
matrix_mult(struct gl_matrix_stack *stack, const GLfloat *m, const char* caller)
{
static float identity[16] = {
1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1,
};
GET_CURRENT_CONTEXT(ctx);
if (!m ||
(m[0] == 1 && m[1] == 0 && m[2] == 0 && m[3] == 0 &&
m[4] == 0 && m[5] == 1 && m[6] == 0 && m[7] == 0 &&
m[8] == 0 && m[9] == 0 && m[10] == 1 && m[11] == 0 &&
m[12] == 0 && m[13] == 0 && m[14] == 0 && m[15] == 1))
if (!m || !memcmp(m, identity, sizeof(identity)))
return;
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx,
"%s(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",