wined3d: Use the FFP HLSL pipeline for pretransformed draws as well.

Approved-by: Jan Sikorski (@jsikorski)
Approved-by: Alexandre Julliard (@julliard)
Merge-Request: https://gitlab.winehq.org/wine/wine/merge_requests/6813

dlls/wined3d/context.c

@@ -161,8 +161,8 @@ void wined3d_stream_info_from_declaration(struct wined3d_stream_info *stream_inf
         const struct wined3d_state *state, const struct wined3d_d3d_info *d3d_info)
 {
     /* We need to deal with frequency data! */
+    BOOL use_vshader = use_vs(state) || (d3d_info->ffp_hlsl && state->shader[WINED3D_SHADER_TYPE_VERTEX]);
     struct wined3d_vertex_declaration *declaration = state->vertex_declaration;
-    BOOL use_vshader = use_vs(state);
     unsigned int i;
 
     stream_info->use_map = 0;

dlls/wined3d/glsl_shader.c

@@ -10425,10 +10425,10 @@ static void set_glsl_shader_program(const struct wined3d_context_gl *context_gl,
         vs_id = ctx_data->glsl_program->vs.id;
         vs_list = &ctx_data->glsl_program->vs.shader_entry;
 
-        if (use_vs(state))
+        if (use_vs(state) || d3d_info->ffp_hlsl)
             vshader = state->shader[WINED3D_SHADER_TYPE_VERTEX];
     }
-    else if (use_vs(state))
+    else if (use_vs(state) || d3d_info->ffp_hlsl)
     {
         struct vs_compile_args vs_compile_args;
 

dlls/wined3d/shader.c

@@ -2701,9 +2701,27 @@ void find_vs_compile_args(const struct wined3d_state *state, const struct wined3
                 && state->transforms[WINED3D_TS_PROJECTION]._24 == 0.0f
                 && state->transforms[WINED3D_TS_PROJECTION]._34 == 0.0f
                 && state->transforms[WINED3D_TS_PROJECTION]._44 == 1.0f)
-            args->fog_src = VS_FOG_Z;
+        {
+            /* Fog source is vertex output Z.
+             *
+             * However, if drawing RHW (which means we are using an HLSL
+             * replacement shader, since we got here), and depth testing is
+             * disabled, primitives are not supposed to be clipped by the
+             * viewport. We handle this in the vertex shader by essentially
+             * flushing output Z to zero.
+             *
+             * Fog needs to still read from the original Z, however. In this
+             * case we read from oFog, which contains the original Z. */
+
+            if (state->vertex_declaration->position_transformed)
+                args->fog_src = VS_FOG_COORD;
+            else
+                args->fog_src = VS_FOG_Z;
+        }
         else
+        {
             args->fog_src = VS_FOG_W;
+        }
     }
     else
     {

dlls/wined3d/stateblock.c

@@ -1575,6 +1575,9 @@ void CDECL wined3d_stateblock_set_vertex_declaration(struct wined3d_stateblock *
                     || declaration->normal != prev->normal || declaration->point_size != prev->point_size)
                 stateblock->changed.ffp_vs_settings = 1;
         }
+
+        if (declaration->position_transformed != prev->position_transformed)
+            stateblock->changed.ffp_vs_settings = 1;
     }
     else
     {
@@ -3814,7 +3817,8 @@ void CDECL wined3d_device_apply_stateblock(struct wined3d_device *device,
      * FFP pipeline cares about. The rest should eventually be removed from
      * those structs and left only in vs_compile_args / ps_compile_args. */
 
-    if (changed->ffp_vs_settings && !state->vs)
+    if (changed->ffp_vs_settings
+            && (!state->vs || !state->vertex_declaration || state->vertex_declaration->position_transformed))
     {
         if (device->adapter->d3d_info.ffp_hlsl)
         {