nv2a: Handle anisotropic filter setting

Implements handling of anisotropic filter level from SET_TEXTURE_CONTROL0.

Author: abaire

hw/xbox/nv2a/nv2a_regs.h

@@ -539,6 +539,7 @@
 #define NV_PGRAPH_TEXCTL0_0                              0x000019CC
 #   define NV_PGRAPH_TEXCTL0_0_COLORKEYMODE                     0x03
 #   define NV_PGRAPH_TEXCTL0_0_ALPHAKILLEN                      (1 << 2)
+#   define NV_PGRAPH_TEXCTL0_0_MAX_ANISOTROPY                   0x30
 #   define NV_PGRAPH_TEXCTL0_0_MAX_LOD_CLAMP                    0x0003FFC0
 #   define NV_PGRAPH_TEXCTL0_0_MIN_LOD_CLAMP                    0x3FFC0000
 #   define NV_PGRAPH_TEXCTL0_0_ENABLE                           (1 << 30)

hw/xbox/nv2a/pgraph/gl/texture.c

@@ -113,7 +113,8 @@ static void apply_texture_parameters(TextureBinding *binding,
                                      unsigned int filter,
                                      unsigned int address,
                                      bool is_bordered,
-                                     uint32_t border_color)
+                                     uint32_t border_color,
+                                     uint32_t max_anisotropy)
 {
     unsigned int min_filter = GET_MASK(filter, NV_PGRAPH_TEXFILTER0_MIN);
     unsigned int mag_filter = GET_MASK(filter, NV_PGRAPH_TEXFILTER0_MAG);
@@ -181,6 +182,8 @@ static void apply_texture_parameters(TextureBinding *binding,
         needs_border_color = needs_border_color || binding->addrp == NV_PGRAPH_TEXADDRESS0_ADDRU_BORDER;
     }
 
+    glTexParameterf(binding->gl_target, GL_TEXTURE_MAX_ANISOTROPY, max_anisotropy);
+
     if (!is_bordered && needs_border_color) {
         if (!binding->border_color_set || binding->border_color != border_color) {
             /* FIXME: Color channels might be wrong order */
@@ -219,6 +222,9 @@ void pgraph_gl_bind_textures(NV2AState *d)
         uint32_t filter = pgraph_reg_r(pg, NV_PGRAPH_TEXFILTER0 + i*4);
         uint32_t address = pgraph_reg_r(pg, NV_PGRAPH_TEXADDRESS0 + i*4);
         uint32_t border_color = pgraph_reg_r(pg, NV_PGRAPH_BORDERCOLOR0 + i*4);
+        uint32_t max_anisotropy =
+            1 << (GET_MASK(pgraph_reg_r(pg, NV_PGRAPH_TEXCTL0_0 + i*4),
+                           NV_PGRAPH_TEXCTL0_0_MAX_ANISOTROPY));
 
         /* Check for unsupported features */
         if (filter & NV_PGRAPH_TEXFILTER0_ASIGNED) NV2A_UNIMPLEMENTED("NV_PGRAPH_TEXFILTER0_ASIGNED");
@@ -268,7 +274,8 @@ void pgraph_gl_bind_textures(NV2AState *d)
                                          filter,
                                          address,
                                          state.border,
-                                         border_color);
+                                         border_color,
+                                         max_anisotropy);
                 continue;
             }
         }
@@ -378,7 +385,8 @@ void pgraph_gl_bind_textures(NV2AState *d)
                                  filter,
                                  address,
                                  state.border,
-                                 border_color);
+                                 border_color,
+                                 max_anisotropy);
 
         if (r->texture_binding[i]) {
             if (r->texture_binding[i]->gl_target != binding->gl_target) {

hw/xbox/nv2a/pgraph/vk/texture.c

@@ -1101,6 +1101,13 @@ static void create_texture(PGRAPHState *pg, int texture_idx)
         pgraph_reg_r(pg, NV_PGRAPH_BORDERCOLOR0 + texture_idx * 4);
     bool is_indexed = (state.color_format ==
             NV097_SET_TEXTURE_FORMAT_COLOR_SZ_I8_A8R8G8B8);
+    uint32_t xbox_max_anisotropy =
+        1 << (GET_MASK(pgraph_reg_r(pg, NV_PGRAPH_TEXCTL0_0 + texture_idx*4),
+                       NV_PGRAPH_TEXCTL0_0_MAX_ANISOTROPY));
+    uint32_t max_anisotropy =
+        xbox_max_anisotropy <= r->device_props.limits.maxSamplerAnisotropy ?
+            xbox_max_anisotropy :
+            r->device_props.limits.maxSamplerAnisotropy;
 
     TextureKey key;
     memset(&key, 0, sizeof(key));
@@ -1354,9 +1361,8 @@ static void create_texture(PGRAPHState *pg, int texture_idx)
             GET_MASK(address, NV_PGRAPH_TEXADDRESS0_ADDRV)),
         .addressModeW = (state.dimensionality > 2) ? lookup_texture_address_mode(
             GET_MASK(address, NV_PGRAPH_TEXADDRESS0_ADDRP)) : 0,
-        .anisotropyEnable = VK_FALSE,
-        // .anisotropyEnable = VK_TRUE,
-        // .maxAnisotropy = properties.limits.maxSamplerAnisotropy,
+        .anisotropyEnable = max_anisotropy > 1,
+        .maxAnisotropy = max_anisotropy,
         .borderColor = vk_border_color,
         .compareEnable = VK_FALSE,
         .compareOp = VK_COMPARE_OP_ALWAYS,