[Mesa-dev] [PATCH 7/9] softpipe: Add functions for computing mipmap level

Krzesimir Nowak krzesimir at kinvolk.io
Wed Sep 9 03:35:36 PDT 2015


These functions will be used by textureQueryLod.
---
 src/gallium/drivers/softpipe/sp_tex_sample.c | 100 +++++++++++++++++++++++++--
 src/gallium/drivers/softpipe/sp_tex_sample.h |   7 ++
 2 files changed, 101 insertions(+), 6 deletions(-)

diff --git a/src/gallium/drivers/softpipe/sp_tex_sample.c b/src/gallium/drivers/softpipe/sp_tex_sample.c
index cdec984..6e639e0 100644
--- a/src/gallium/drivers/softpipe/sp_tex_sample.c
+++ b/src/gallium/drivers/softpipe/sp_tex_sample.c
@@ -1937,6 +1937,38 @@ get_gather_component(const float lod_in[TGSI_QUAD_SIZE])
 }
 
 static void
+clamp_lod(const struct sp_sampler_view *sp_sview,
+          const struct sp_sampler *sp_samp,
+          const float lod[TGSI_QUAD_SIZE],
+          float clamped[TGSI_QUAD_SIZE])
+{
+   const float min_lod = sp_samp->base.min_lod;
+   const float max_lod = sp_samp->base.max_lod;
+   const float min_level = sp_sview->base.u.tex.first_level;
+   const float max_level = sp_sview->base.u.tex.last_level;
+   int i;
+
+   for (i = 0; i < TGSI_QUAD_SIZE; i++) {
+      float cl = lod[i];
+
+      cl = CLAMP(cl, min_lod, max_lod);
+      /* XXX: Is min_level ever different from 0?
+       */
+      cl = CLAMP(cl, 0, max_level - min_level);
+      clamped[i] = cl;
+   }
+}
+
+static void
+mip_level_linear(struct sp_sampler_view *sp_sview,
+                 struct sp_sampler *sp_samp,
+                 const float lod[TGSI_QUAD_SIZE],
+                 float level[TGSI_QUAD_SIZE])
+{
+   clamp_lod(sp_sview, sp_samp, lod, level);
+}
+
+static void
 mip_filter_linear(struct sp_sampler_view *sp_sview,
                   struct sp_sampler *sp_samp,
                   img_filter_func min_filter,
@@ -1998,6 +2030,23 @@ mip_filter_linear(struct sp_sampler_view *sp_sview,
 }
 
 
+static void
+mip_level_nearest(struct sp_sampler_view *sp_sview,
+                  struct sp_sampler *sp_samp,
+                  const float lod[TGSI_QUAD_SIZE],
+                  float level[TGSI_QUAD_SIZE])
+{
+   const int first_level = sp_sview->base.u.tex.first_level;
+   int j;
+
+   clamp_lod(sp_sview, sp_samp, lod, level);
+   for (j = 0; j < TGSI_QUAD_SIZE; j++)
+      /* TODO: It should rather be:
+       * level[j] = first_level + ceil(level[j] + 0.5F) - 1.0F;
+       */
+      level[j] = first_level + (int)(level[j] + 0.5F);
+}
+
 /**
  * Compute nearest mipmap level from texcoords.
  * Then sample the texture level for four elements of a quad.
@@ -2050,6 +2099,19 @@ mip_filter_nearest(struct sp_sampler_view *sp_sview,
 
 
 static void
+mip_level_none(struct sp_sampler_view *sp_sview,
+               struct sp_sampler *sp_samp,
+               const float lod[TGSI_QUAD_SIZE],
+               float level[TGSI_QUAD_SIZE])
+{
+   int j;
+
+   for (j = 0; j < TGSI_QUAD_SIZE; j++) {
+      level[j] = sp_sview->base.u.tex.first_level;
+   }
+}
+
+static void
 mip_filter_none(struct sp_sampler_view *sp_sview,
                 struct sp_sampler *sp_samp,
                 img_filter_func min_filter,
@@ -2088,6 +2150,15 @@ mip_filter_none(struct sp_sampler_view *sp_sview,
 
 
 static void
+mip_level_none_no_filter_select(struct sp_sampler_view *sp_sview,
+                                struct sp_sampler *sp_samp,
+                                const float lod[TGSI_QUAD_SIZE],
+                                float level[TGSI_QUAD_SIZE])
+{
+   mip_level_none(sp_sview, sp_samp, lod, level);
+}
+
+static void
 mip_filter_none_no_filter_select(struct sp_sampler_view *sp_sview,
                                  struct sp_sampler *sp_samp,
                                  img_filter_func min_filter,
@@ -2339,6 +2410,15 @@ img_filter_2d_ewa(struct sp_sampler_view *sp_sview,
 }
 
 
+static void
+mip_level_linear_aniso(struct sp_sampler_view *sp_sview,
+                       struct sp_sampler *sp_samp,
+                       const float lod[TGSI_QUAD_SIZE],
+                       float level[TGSI_QUAD_SIZE])
+{
+   mip_level_linear(sp_sview, sp_samp, lod, level);
+}
+
 /**
  * Sample 2D texture using an anisotropic filter.
  */
@@ -2450,6 +2530,14 @@ mip_filter_linear_aniso(struct sp_sampler_view *sp_sview,
    }
 }
 
+static void
+mip_level_linear_2d_linear_repeat_POT(struct sp_sampler_view *sp_sview,
+                                      struct sp_sampler *sp_samp,
+                                      const float lod[TGSI_QUAD_SIZE],
+                                      float level[TGSI_QUAD_SIZE])
+{
+   mip_level_linear(sp_sview, sp_samp, lod, level);
+}
 
 /**
  * Specialized version of mip_filter_linear with hard-wired calls to
@@ -2515,12 +2603,12 @@ mip_filter_linear_2d_linear_repeat_POT(
    }
 }
 
-static struct sp_mip mip_linear = {mip_filter_linear};
-static struct sp_mip mip_nearest = {mip_filter_nearest};
-static struct sp_mip mip_none = {mip_filter_none};
-static struct sp_mip mip_none_no_filter_select = {mip_filter_none_no_filter_select};
-static struct sp_mip mip_linear_aniso = {mip_filter_linear_aniso};
-static struct sp_mip mip_linear_2d_linear_repeat_POT = {mip_filter_linear_2d_linear_repeat_POT};
+static struct sp_mip mip_linear = {mip_level_linear, mip_filter_linear};
+static struct sp_mip mip_nearest = {mip_level_nearest, mip_filter_nearest};
+static struct sp_mip mip_none = {mip_level_none, mip_filter_none};
+static struct sp_mip mip_none_no_filter_select = {mip_level_none_no_filter_select, mip_filter_none_no_filter_select};
+static struct sp_mip mip_linear_aniso = {mip_level_linear_aniso, mip_filter_linear_aniso};
+static struct sp_mip mip_linear_2d_linear_repeat_POT = {mip_level_linear_2d_linear_repeat_POT, mip_filter_linear_2d_linear_repeat_POT};
 
 /**
  * Do shadow/depth comparisons.
diff --git a/src/gallium/drivers/softpipe/sp_tex_sample.h b/src/gallium/drivers/softpipe/sp_tex_sample.h
index 7739f59..89cf9d1 100644
--- a/src/gallium/drivers/softpipe/sp_tex_sample.h
+++ b/src/gallium/drivers/softpipe/sp_tex_sample.h
@@ -87,6 +87,12 @@ typedef void (*mip_filter_func)(struct sp_sampler_view *sp_sview,
                                 float rgba[TGSI_NUM_CHANNELS][TGSI_QUAD_SIZE]);
 
 
+typedef void (*mip_level_func)(struct sp_sampler_view *sp_sview,
+                               struct sp_sampler *sp_samp,
+                               const float lod[TGSI_QUAD_SIZE],
+                               float level[TGSI_QUAD_SIZE]);
+
+
 typedef void (*convert_func)(struct sp_sampler_view *sp_sview,
                              struct sp_sampler *sp_samp,
                              const float s[TGSI_QUAD_SIZE],
@@ -129,6 +135,7 @@ struct sp_sampler_view
 };
 
 struct sp_mip {
+   mip_level_func level;
    mip_filter_func filter;
 };
 
-- 
2.4.3



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