From 16f7510ad30070b7bd4eff494f7937f6ee257547 Mon Sep 17 00:00:00 2001 From: Kenneth Graunke Date: Sun, 9 Feb 2014 16:29:41 -0800 Subject: [PATCH] i965: Duplicate less code in GetSamplePositions driver hook. 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 Reviewed-by: Ian Romanick Reviewed-by: Chris Forbes --- src/mesa/drivers/dri/i965/gen6_multisample_state.c | 23 +++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/src/mesa/drivers/dri/i965/gen6_multisample_state.c b/src/mesa/drivers/dri/i965/gen6_multisample_state.c index f28e88022c6..fd3dd0e5363 100644 --- a/src/mesa/drivers/dri/i965/gen6_multisample_state.c +++ b/src/mesa/drivers/dri/i965/gen6_multisample_state.c @@ -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; - 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; + case 8: + bits = brw_multisample_positions_8x[index >> 2] >> (8 * (index & 3)); 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; } /** -- 2.11.0