wined3d: Initialize unwritten texcoord varyings in the FFP replacement vertex shader.

dlls/wined3d/glsl_shader.c

@@ -5802,6 +5802,8 @@ static GLuint shader_glsl_generate_ffp_vertex_shader(struct wined3d_string_buffe
                 if (settings->texcoords & (1u << i))
                     shader_addline(buffer, "gl_TexCoord[%u] = ffp_texture_matrix[%u] * ffp_attrib_texcoord%u;\n",
                             i, i, i);
+                else if (gl_info->limits.glsl_varyings >= wined3d_max_compat_varyings(gl_info))
+                    shader_addline(buffer, "gl_TexCoord[%u] = vec4(0.0);\n", i);
                 break;
 
             case WINED3DTSS_TCI_CAMERASPACENORMAL:

dlls/wined3d/utils.c

@@ -4343,6 +4343,13 @@ DWORD get_flexible_vertex_size(DWORD d3dvtVertexType) {
     return size;
 }
 
+unsigned int wined3d_max_compat_varyings(const struct wined3d_gl_info *gl_info)
+{
+    /* On core profile we have to also count diffuse and specular colors and the
+     * fog coordinate. */
+    return gl_info->supported[WINED3D_GL_LEGACY_CONTEXT] ? MAX_TEXTURES * 4 : (MAX_TEXTURES + 2) * 4 + 1;
+}
+
 void gen_ffp_frag_op(const struct wined3d_context *context, const struct wined3d_state *state,
         struct ffp_frag_settings *settings, BOOL ignore_textype)
 {

dlls/wined3d/wined3d_private.h

@@ -1877,6 +1877,7 @@ extern const struct wine_rb_functions wined3d_ffp_frag_program_rb_functions DECL
 extern const struct wine_rb_functions wined3d_ffp_vertex_program_rb_functions DECLSPEC_HIDDEN;
 extern const struct wined3d_parent_ops wined3d_null_parent_ops DECLSPEC_HIDDEN;
 
+unsigned int wined3d_max_compat_varyings(const struct wined3d_gl_info *gl_info) DECLSPEC_HIDDEN;
 void gen_ffp_frag_op(const struct wined3d_context *context, const struct wined3d_state *state,
         struct ffp_frag_settings *settings, BOOL ignore_textype) DECLSPEC_HIDDEN;
 const struct ffp_frag_desc *find_ffp_frag_shader(const struct wine_rb_tree *fragment_shaders,