mesa: Add performance debug for meta code.

I noticed a fallback in regnum through sysprof, and wanted a nicer way to
get information about it.

Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/common/meta.c

@@ -3048,16 +3048,33 @@ _mesa_meta_check_generate_mipmap_fallback(struct gl_context *ctx, GLenum target,
    GLenum status;
 
    /* check for fallbacks */
-   if (!ctx->Extensions.EXT_framebuffer_object ||
-       target == GL_TEXTURE_3D ||
+   if (!ctx->Extensions.EXT_framebuffer_object) {
+      _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_HIGH,
+                       "glGenerateMipmap() without FBOs\n");
+      return GL_TRUE;
+   }
+
+   if (target == GL_TEXTURE_3D ||
        target == GL_TEXTURE_1D_ARRAY ||
        target == GL_TEXTURE_2D_ARRAY) {
+      _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_HIGH,
+                       "glGenerateMipmap() to %s target\n",
+                       _mesa_lookup_enum_by_nr(target));
       return GL_TRUE;
    }
 
    srcLevel = texObj->BaseLevel;
    baseImage = _mesa_select_tex_image(ctx, texObj, target, srcLevel);
-   if (!baseImage || _mesa_is_format_compressed(baseImage->TexFormat)) {
+   if (!baseImage) {
+      _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_HIGH,
+                       "glGenerateMipmap() couldn't find base teximage\n");
+      return GL_TRUE;
+   }
+
+   if (_mesa_is_format_compressed(baseImage->TexFormat)) {
+      _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_HIGH,
+                       "glGenerateMipmap() with %s format\n",
+                       _mesa_get_format_name(baseImage->TexFormat));
       return GL_TRUE;
    }
 
@@ -3067,6 +3084,9 @@ _mesa_meta_check_generate_mipmap_fallback(struct gl_context *ctx, GLenum target,
        * texture sample conversion.  So we won't be able to generate the
        * right colors when rendering.  Need to use a fallback.
        */
+      _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_HIGH,
+                       "glGenerateMipmap() of sRGB texture without "
+                       "sRGB decode\n");
       return GL_TRUE;
    }
 
@@ -3103,6 +3123,8 @@ _mesa_meta_check_generate_mipmap_fallback(struct gl_context *ctx, GLenum target,
    _mesa_BindFramebuffer(GL_FRAMEBUFFER_EXT, fboSave);
 
    if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+      _mesa_perf_debug(ctx, MESA_DEBUG_SEVERITY_HIGH,
+                       "glGenerateMipmap() got incomplete FBO\n");
       return GL_TRUE;
    }
 

src/mesa/main/errors.h

@@ -73,6 +73,16 @@ _mesa_gl_debug(struct gl_context *ctx,
                enum mesa_debug_severity severity,
                const char *fmtString, ...) PRINTFLIKE(5, 6);
 
+#define _mesa_perf_debug(ctx, sev, ...) do {                              \
+   static GLuint msg_id = 0;                                              \
+   if (unlikely(ctx->Const.ContextFlags & GL_CONTEXT_FLAG_DEBUG_BIT)) {   \
+      _mesa_gl_debug(ctx, &msg_id,                                        \
+                     MESA_DEBUG_TYPE_PERFORMANCE,                         \
+                     sev,                                                 \
+                     __VA_ARGS__);                                        \
+   }                                                                      \
+} while (0)
+
 extern void
 _mesa_shader_debug(struct gl_context *ctx, GLenum type, GLuint *id,
                    const char *msg, int len);