From 6d2d5ceca21c87bea5e269e8099fb6f1d821b97a Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Tue, 14 Oct 2008 12:42:21 -0600
Subject: [PATCH] cell: use minify vs magnify filters

---
 src/gallium/drivers/cell/spu/spu_command.c | 50 ++++++++++++++++------
 src/gallium/drivers/cell/spu/spu_main.h    |  2 +
 src/gallium/drivers/cell/spu/spu_texture.c | 22 ++++++----
 3 files changed, 53 insertions(+), 21 deletions(-)

diff --git a/src/gallium/drivers/cell/spu/spu_command.c b/src/gallium/drivers/cell/spu/spu_command.c
index 4e98eea3389..fa78377c663 100644
--- a/src/gallium/drivers/cell/spu/spu_command.c
+++ b/src/gallium/drivers/cell/spu/spu_command.c
@@ -298,22 +298,48 @@ cmd_state_framebuffer(const struct cell_command_framebuffer *cmd)
 static void
 cmd_state_sampler(const struct cell_command_sampler *sampler)
 {
-   DEBUG_PRINTF("SAMPLER [%u]\n", sampler->unit);
+   uint unit = sampler->unit;
 
-   spu.sampler[sampler->unit] = sampler->state;
+   DEBUG_PRINTF("SAMPLER [%u]\n", unit);
 
-   if (spu.sampler[sampler->unit].min_mip_filter != PIPE_TEX_MIPFILTER_NONE) {
-      /* use lambda/lod to determine min vs. mag filter */
-      spu.sample_texture4[sampler->unit] = sample_texture4_lod;
+   spu.sampler[unit] = sampler->state;
+
+   switch (spu.sampler[unit].min_img_filter) {
+   case PIPE_TEX_FILTER_LINEAR:
+      spu.min_sample_texture4[unit] = sample_texture4_bilinear;
+      break;
+   case PIPE_TEX_FILTER_ANISO:
+      /* fall-through, for now */
+   case PIPE_TEX_FILTER_NEAREST:
+      spu.min_sample_texture4[unit] = sample_texture4_nearest;
+      break;
+   default:
+      ASSERT(0);
    }
-   else if (spu.sampler[sampler->unit].min_img_filter
-            == PIPE_TEX_FILTER_LINEAR) {
-      /* min = mag = bilinear */
-      spu.sample_texture4[sampler->unit] = sample_texture4_bilinear;
+
+   switch (spu.sampler[sampler->unit].mag_img_filter) {
+   case PIPE_TEX_FILTER_LINEAR:
+      spu.mag_sample_texture4[unit] = sample_texture4_bilinear;
+      break;
+   case PIPE_TEX_FILTER_ANISO:
+      /* fall-through, for now */
+   case PIPE_TEX_FILTER_NEAREST:
+      spu.mag_sample_texture4[unit] = sample_texture4_nearest;
+      break;
+   default:
+      ASSERT(0);
    }
-   else {
-      /* min = mag = inearest */
-      spu.sample_texture4[sampler->unit] = sample_texture4_nearest;
+
+   switch (spu.sampler[sampler->unit].min_mip_filter) {
+   case PIPE_TEX_MIPFILTER_NEAREST:
+   case PIPE_TEX_MIPFILTER_LINEAR:
+      spu.sample_texture4[unit] = sample_texture4_lod;
+      break;
+   case PIPE_TEX_MIPFILTER_NONE:
+      spu.sample_texture4[unit] = spu.mag_sample_texture4[unit];
+      break;
+   default:
+      ASSERT(0);
    }
 }
 
diff --git a/src/gallium/drivers/cell/spu/spu_main.h b/src/gallium/drivers/cell/spu/spu_main.h
index cfb645add02..56aac655e90 100644
--- a/src/gallium/drivers/cell/spu/spu_main.h
+++ b/src/gallium/drivers/cell/spu/spu_main.h
@@ -170,6 +170,8 @@ struct spu_global
 
    /** Current texture sampler function */
    spu_sample_texture4_func sample_texture4[CELL_MAX_SAMPLERS];
+   spu_sample_texture4_func min_sample_texture4[CELL_MAX_SAMPLERS];
+   spu_sample_texture4_func mag_sample_texture4[CELL_MAX_SAMPLERS];
 
    /** Fragment program constants */
    vector float constants[4 * CELL_MAX_CONSTANTS];
diff --git a/src/gallium/drivers/cell/spu/spu_texture.c b/src/gallium/drivers/cell/spu/spu_texture.c
index 10036330c6c..267f2302f60 100644
--- a/src/gallium/drivers/cell/spu/spu_texture.c
+++ b/src/gallium/drivers/cell/spu/spu_texture.c
@@ -400,7 +400,7 @@ compute_lambda(uint unit, vector float s, vector float t)
 void
 sample_texture4_lod(vector float s, vector float t,
                     vector float r, vector float q,
-                    uint unit, uint level, vector float colors[4])
+                    uint unit, uint level_ignored, vector float colors[4])
 {
    /*
     * Note that we're computing a lambda/lod here that's used for all
@@ -417,13 +417,17 @@ sample_texture4_lod(vector float s, vector float t,
    else if (lambda > spu.sampler[unit].max_lod)
       lambda = spu.sampler[unit].max_lod;
 
-   /* convert to int level */
-   level = (int) (lambda + 0.5f);
-   ASSERT(level >= 0);
-
-   if (level > spu.texture[unit].max_level)
-      level = spu.texture[unit].max_level;
-
-   sample_texture4_bilinear_2(s, t, r, q, unit, level, colors);
+   if (lambda <= 0.0f) {
+      /* magnify */
+      spu.mag_sample_texture4[unit](s, t, r, q, unit, 0, colors);
+   }
+   else {
+      /* minify */
+      int level = (int) (lambda + 0.5f);
+      if (level > (int) spu.texture[unit].max_level)
+         level = spu.texture[unit].max_level;
+      spu.min_sample_texture4[unit](s, t, r, q, unit, level, colors);
+      /* XXX to do: mipmap level interpolation */
+   }
 }
 
-- 
2.30.2