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Pica/VertexShader: Fixed LOOP with more than one iteration.

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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.
This commit is contained in:
Subv 2015-02-21 12:52:21 -05:00
parent c7d1480ece
commit 9a03e9c61d
1 changed files with 4 additions and 1 deletions
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5
src/video_core/vertex_shader.cpp
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@ -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();