From 9a03e9c61d0f2d3d28dad66cd05656d256468027 Mon Sep 17 00:00:00 2001 From: Subv Date: Sat, 21 Feb 2015 12:52:21 -0500 Subject: [PATCH] Pica/VertexShader: Fixed LOOP with more than one iteration. Previously it wouldn't jump back to the start of the loop code once it reached the end of the block. Fixes the texture problems in a lot of games. --- src/video_core/vertex_shader.cpp | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/src/video_core/vertex_shader.cpp b/src/video_core/vertex_shader.cpp index def868ac7..bc8c0041c 100644 --- a/src/video_core/vertex_shader.cpp +++ b/src/video_core/vertex_shader.cpp @@ -90,6 +90,7 @@ struct VertexShaderState { u8 repeat_counter; // How often to repeat until this call stack element is removed u8 loop_increment; // Which value to add to the loop counter after an iteration // TODO: Should this be a signed value? Does it even matter? + u32 loop_address; // The address where we'll return to after each loop iteration }; // TODO: Is there a maximal size for this? @@ -115,6 +116,8 @@ static void ProcessShaderCode(VertexShaderState& state) { if (top.repeat_counter-- == 0) { state.program_counter = &shader_memory[top.return_address]; state.call_stack.pop(); + } else { + state.program_counter = &shader_memory[top.loop_address]; } // TODO: Is "trying again" accurate to hardware? @@ -129,7 +132,7 @@ static void ProcessShaderCode(VertexShaderState& state) { static auto call = [](VertexShaderState& state, u32 offset, u32 num_instructions, u32 return_offset, u8 repeat_count, u8 loop_increment) { state.program_counter = &shader_memory[offset] - 1; // -1 to make sure when incrementing the PC we end up at the correct offset - state.call_stack.push({ offset + num_instructions, return_offset, repeat_count, loop_increment }); + state.call_stack.push({ offset + num_instructions, return_offset, repeat_count, loop_increment, offset }); }; u32 binary_offset = state.program_counter - shader_memory.data();