driconf: add allow_incorrect_primitive_id option

And enable it for SPECviewperf.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7078>

src/gallium/auxiliary/pipe-loader/driinfo_gallium.h

@@ -30,6 +30,7 @@ DRI_CONF_SECTION_DEBUG
    DRI_CONF_FORCE_GLSL_ABS_SQRT(false)
    DRI_CONF_GLSL_CORRECT_DERIVATIVES_AFTER_DISCARD(false)
    DRI_CONF_ALLOW_DRAW_OUT_OF_ORDER(false)
+   DRI_CONF_ALLOW_INCORRECT_PRIMITIVE_ID(false)
    DRI_CONF_FORCE_COMPAT_PROFILE(false)
    DRI_CONF_FORCE_GL_NAMES_REUSE(false)
    DRI_CONF_FORCE_GL_VENDOR()

src/gallium/frontends/dri/dri_screen.c

@@ -97,6 +97,8 @@ dri_fill_st_options(struct dri_screen *screen)
       driQueryOptionb(optionCache, "allow_glsl_cross_stage_interpolation_mismatch");
    options->allow_draw_out_of_order =
       driQueryOptionb(optionCache, "allow_draw_out_of_order");
+   options->allow_incorrect_primitive_id =
+      driQueryOptionb(optionCache, "allow_incorrect_primitive_id");
    options->force_gl_names_reuse =
       driQueryOptionb(optionCache, "force_gl_names_reuse");
 

src/gallium/include/frontend/api.h

@@ -232,6 +232,7 @@ struct st_config_options
    bool force_glsl_abs_sqrt;
    bool allow_glsl_cross_stage_interpolation_mismatch;
    bool allow_draw_out_of_order;
+   bool allow_incorrect_primitive_id;
    bool force_integer_tex_nearest;
    bool force_gl_names_reuse;
    char *force_gl_vendor;

src/mesa/main/mtypes.h

@@ -4232,6 +4232,10 @@ struct gl_constants
    /** Whether out-of-order draw (Begin/End) optimizations are allowed. */
    bool AllowDrawOutOfOrder;
 
+   /** Whether draw merging optimizations are allowed (might cause
+    *  incorrect results). */
+   bool AllowIncorrectPrimitiveId;
+
    /** Whether to allow the fast path for frequently updated VAOs. */
    bool AllowDynamicVAOFastPath;
 

src/mesa/main/state.c

@@ -151,7 +151,7 @@ void
 _mesa_update_primitive_id_is_unused(struct gl_context *ctx)
 {
    /* Only the compatibility profile with display lists needs this. */
-   if (ctx->API != API_OPENGL_COMPAT)
+   if (ctx->API != API_OPENGL_COMPAT || ctx->Const.AllowIncorrectPrimitiveId)
       return;
 
    /* If all of these are NULL, GLSL is disabled. */

src/mesa/state_tracker/st_extensions.c

@@ -1770,6 +1770,7 @@ void st_init_extensions(struct pipe_screen *screen,
    }
 
    consts->AllowDrawOutOfOrder = options->allow_draw_out_of_order;
+   consts->AllowIncorrectPrimitiveId = options->allow_incorrect_primitive_id;
 
    bool prefer_nir = PIPE_SHADER_IR_NIR ==
          screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT, PIPE_SHADER_CAP_PREFERRED_IR);

src/mesa/vbo/vbo_save_draw.c

@@ -211,7 +211,8 @@ vbo_save_playback_vertex_list(struct gl_context *ctx, void *data)
       assert(ctx->NewState == 0);
 
       if (node->vertex_count > 0) {
-         bool draw_using_merged_prim = ctx->_PrimitiveIDIsUnused &&
+         bool draw_using_merged_prim = (ctx->Const.AllowIncorrectPrimitiveId ||
+                                        ctx->_PrimitiveIDIsUnused) &&
                                        node->merged.prims;
          if (!draw_using_merged_prim) {
             ctx->Driver.Draw(ctx, node->prims, node->prim_count,

src/util/00-mesa-defaults.conf

@@ -292,6 +292,8 @@ TODO: document the other workarounds.
             <option name="force_gl_vendor" value="NVIDIA Corporation" />
             <!-- creo-02 doesn't enable GL_EXT_shader_image_load_store in GLSL -->
             <option name="force_glsl_extensions_warn" value="true" />
+            <!-- Enable draw merging inside display list for snx-03 -->
+            <option name="allow_incorrect_primitive_id" value="true" />
         </application>
 
         <!-- The GL thread allowlist is below, workarounds are above.

src/util/driconf.h

@@ -203,6 +203,10 @@
    DRI_CONF_OPT_B(allow_draw_out_of_order, def, \
                   "Allow out-of-order draw optimizations. Set when Z fighting doesn't have to be accurate.")
 
+#define DRI_CONF_ALLOW_INCORRECT_PRIMITIVE_ID(def) \
+   DRI_CONF_OPT_B(allow_incorrect_primitive_id, def, \
+                  "Allows drawing display list using merged draws (might cause invalid gl_PrimitiveID values).")
+
 #define DRI_CONF_FORCE_GL_VENDOR(def) \
    DRI_CONF_OPT_S(force_gl_vendor, def, "Override GPU vendor string.")