draw/llvm: fix inputs to the geometry shader

We can't clip and viewport transform the vertices before we let
the geometry shader process them. Lets make sure the generated
vertex shader has both disabled if geometry shader is present.

Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: José Fonseca <jfonseca@vmware.com>

diff --git a/src/gallium/auxiliary/draw/draw_llvm.c b/src/gallium/auxiliary/draw/draw_llvm.c
index 763158b..f1c1f55 100644 (file)
--- a/src/gallium/auxiliary/draw/draw_llvm.c
+++ b/src/gallium/auxiliary/draw/draw_llvm.c
@@ -1177,10 +1177,15 @@ draw_llvm_generate(struct draw_llvm *llvm, struct draw_llvm_variant *variant,
    LLVMValueRef fetch_max;
    struct lp_build_sampler_soa *sampler = 0;
    LLVMValueRef ret, clipmask_bool_ptr;
-   const boolean bypass_viewport = variant->key.bypass_viewport;
-   const boolean enable_cliptest = variant->key.clip_xy || 
-                                   variant->key.clip_z  ||
-                                   variant->key.clip_user;
+   const struct draw_geometry_shader *gs = draw->gs.geometry_shader;
+   /* If geometry shader is present we need to skip both the viewport
+    * transformation and clipping otherwise the inputs to the geometry
+    * shader will be incorrect.
+    */
+   const boolean bypass_viewport = gs || variant->key.bypass_viewport;
+   const boolean enable_cliptest = !gs && (variant->key.clip_xy ||
+                                           variant->key.clip_z  ||
+                                           variant->key.clip_user);
    LLVMValueRef variant_func;
    const unsigned pos = draw_current_shader_position_output(llvm->draw);
    const unsigned cv = draw_current_shader_clipvertex_output(llvm->draw);