From 697b50c3ff1b0d179c5862efa56cb19fa640824c Mon Sep 17 00:00:00 2001
From: Tony Wasserka <NeoBrainX@gmail.com>
Date: Sat, 23 Aug 2014 14:14:34 +0200
Subject: [PATCH] Pica/VertexShader: Fix a bug in the call stack handling.
---
src/video_core/vertex_shader.cpp | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/src/video_core/vertex_shader.cpp b/src/video_core/vertex_shader.cpp
index cdecbff3c7..db8244317c 100644
--- a/src/video_core/vertex_shader.cpp
+++ b/src/video_core/vertex_shader.cpp
@@ -191,8 +191,9 @@ static void ProcessShaderCode(VertexShaderState& state) {
if (*state.call_stack_pointer == VertexShaderState::INVALID_ADDRESS) {
exit_loop = true;
} else {
- state.program_counter = &shader_memory[*state.call_stack_pointer--];
- *state.call_stack_pointer = VertexShaderState::INVALID_ADDRESS;
+ // Jump back to call stack position, invalidate call stack entry, move up call stack pointer
+ state.program_counter = &shader_memory[*state.call_stack_pointer];
+ *state.call_stack_pointer-- = VertexShaderState::INVALID_ADDRESS;
}
break;