[Freedreno] [PATCH] freedreno/a4xx: support lod_bias

[Ilia Mirkin]

The lower layers assume that we support this, and it's been core since
GL 1.4. This fixes a slew of piglit tests, especially around
tex-miplevel-selection.

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
Cc: mesa-stable at lists.freedesktop.org
---
 src/gallium/drivers/freedreno/a4xx/a4xx.xml.h    | 6 ++++++
 src/gallium/drivers/freedreno/a4xx/fd4_texture.c | 1 +
 2 files changed, 7 insertions(+)

diff --git a/src/gallium/drivers/freedreno/a4xx/a4xx.xml.h b/src/gallium/drivers/freedreno/a4xx/a4xx.xml.h
index 76f525c..07d0db1 100644
--- a/src/gallium/drivers/freedreno/a4xx/a4xx.xml.h
+++ b/src/gallium/drivers/freedreno/a4xx/a4xx.xml.h
@@ -2741,6 +2741,12 @@ static inline uint32_t A4XX_TEX_SAMP_0_ANISO(enum a4xx_tex_aniso val)
 {
 	return ((val) << A4XX_TEX_SAMP_0_ANISO__SHIFT) & A4XX_TEX_SAMP_0_ANISO__MASK;
 }
+#define A4XX_TEX_SAMP_0_LOD_BIAS__MASK				0xfff80000
+#define A4XX_TEX_SAMP_0_LOD_BIAS__SHIFT				19
+static inline uint32_t A4XX_TEX_SAMP_0_LOD_BIAS(float val)
+{
+	return ((((int32_t)(val * 256.0))) << A4XX_TEX_SAMP_0_LOD_BIAS__SHIFT) & A4XX_TEX_SAMP_0_LOD_BIAS__MASK;
+}
 
 #define REG_A4XX_TEX_SAMP_1					0x00000001
 #define A4XX_TEX_SAMP_1_COMPARE_FUNC__MASK			0x0000000e
diff --git a/src/gallium/drivers/freedreno/a4xx/fd4_texture.c b/src/gallium/drivers/freedreno/a4xx/fd4_texture.c
index 297854f..886b454 100644
--- a/src/gallium/drivers/freedreno/a4xx/fd4_texture.c
+++ b/src/gallium/drivers/freedreno/a4xx/fd4_texture.c
@@ -127,6 +127,7 @@ fd4_sampler_state_create(struct pipe_context *pctx,
 		COND(!cso->normalized_coords, A4XX_TEX_SAMP_1_UNNORM_COORDS);
 
 	if (cso->min_mip_filter != PIPE_TEX_MIPFILTER_NONE) {
+		so->texsamp0 |= A4XX_TEX_SAMP_0_LOD_BIAS(cso->lod_bias);
 		so->texsamp1 |=
 			A4XX_TEX_SAMP_1_MIN_LOD(cso->min_lod) |
 			A4XX_TEX_SAMP_1_MAX_LOD(cso->max_lod);
-- 
2.4.10