sokol_gfx.h: new sg_sampler_desc validation: max_anistropy > 1 requir…

…es all filters to be linear
floooh · Sep 4, 2023 · 8b49fa7 · 8b49fa7
1 parent 38eee79
commit 8b49fa7
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/sokol_gfx.h b/sokol_gfx.h
@@ -2981,6 +2981,7 @@ typedef struct sg_pass_info {
     _SG_LOGITEM_XMACRO(VALIDATE_SAMPLERDESC_CANARY, "sg_sampler_desc not initialized") \
     _SG_LOGITEM_XMACRO(VALIDATE_SAMPLERDESC_MINFILTER_NONE, "sg_sampler_desc.min_filter cannot be SG_FILTER_NONE") \
     _SG_LOGITEM_XMACRO(VALIDATE_SAMPLERDESC_MAGFILTER_NONE, "sg_sampler_desc.mag_filter cannot be SG_FILTER_NONE") \
+    _SG_LOGITEM_XMACRO(VALIDATE_SAMPLERDESC_ANISTROPIC_REQUIRES_LINEAR_FILTERING, "sg_sampler_desc.max_anisotropy > 1 requires min/mag/mipmap_filter to be SG_FILTER_LINEAR") \
     _SG_LOGITEM_XMACRO(VALIDATE_SHADERDESC_CANARY, "sg_shader_desc not initialized") \
     _SG_LOGITEM_XMACRO(VALIDATE_SHADERDESC_SOURCE, "shader source code required") \
     _SG_LOGITEM_XMACRO(VALIDATE_SHADERDESC_BYTECODE, "shader byte code required") \
@@ -14507,6 +14508,13 @@ _SOKOL_PRIVATE bool _sg_validate_sampler_desc(const sg_sampler_desc* desc) {
         _SG_VALIDATE(desc->_end_canary == 0, VALIDATE_SAMPLERDESC_CANARY);
         _SG_VALIDATE(desc->min_filter != SG_FILTER_NONE, VALIDATE_SAMPLERDESC_MINFILTER_NONE);
         _SG_VALIDATE(desc->mag_filter != SG_FILTER_NONE, VALIDATE_SAMPLERDESC_MAGFILTER_NONE);
+        // restriction from WebGPU: when anisotropy > 1, all filters must be linear
+        if (desc->max_anisotropy > 1) {
+            _SG_VALIDATE((desc->min_filter == SG_FILTER_LINEAR)
+                      && (desc->mag_filter == SG_FILTER_LINEAR)
+                      && (desc->mipmap_filter == SG_FILTER_LINEAR),
+                      VALIDATE_SAMPLERDESC_ANISTROPIC_REQUIRES_LINEAR_FILTERING);
+        }
         return _sg_validate_end();
     #endif
 }