fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2026-05-05 09:38:07 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions 2

i965: Duplicate less code in GetSamplePositions driver hook.

Browse source 
The 4x and 8x cases contained identical code for extracting the X and
Y sample offset values and converting them from U0.4 back to float.

Without this refactoring, we'd have to duplicate it a third time in
order to support 2x MSAA.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
This commit is contained in:
Kenneth Graunke 2014-02-09 16:29:41 -08:00
parent 40dd777b33
commit 16f7510ad3
1 changed files with 12 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

23
src/mesa/drivers/dri/i965/gen6_multisample_state.c
View file

@ -32,25 +32,26 @@ gen6_get_sample_position(struct gl_context *ctx,
struct gl_framebuffer *fb,
GLuint index, GLfloat *result)
{
uint8_t bits;
switch (fb->Visual.samples) {
case 1:
result[0] = result[1] = 0.5f;
return;
case 4:
bits = brw_multisample_positions_4x[0] >> (8 * index);
break;
case 4: {
uint8_t val = (uint8_t)(brw_multisample_positions_4x[0] >> (8*index));
result[0] = ((val >> 4) & 0xf) / 16.0f;
result[1] = (val & 0xf) / 16.0f;
case 8:
bits = brw_multisample_positions_8x[index >> 2] >> (8 * (index & 3));
break;
}
case 8: {
uint8_t val = (uint8_t)(brw_multisample_positions_8x[index>>2] >> (8*(index & 3)));
result[0] = ((val >> 4) & 0xf) / 16.0f;
result[1] = (val & 0xf) / 16.0f;
break;
}
default:
assert(!"Not implemented");
return;
}
/* Convert from U0.4 back to a floating point coordinate. */
result[0] = ((bits >> 4) & 0xf) / 16.0f;
result[1] = (bits & 0xf) / 16.0f;
}
/**