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Merge pull request #593 from Subv/search_problem
Pica/VertexShader: Fixed LOOP with more than one iteration.
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commit
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@ -90,6 +90,7 @@ struct VertexShaderState {
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u8 repeat_counter; // How often to repeat until this call stack element is removed
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u8 loop_increment; // Which value to add to the loop counter after an iteration
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// TODO: Should this be a signed value? Does it even matter?
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u32 loop_address; // The address where we'll return to after each loop iteration
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};
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// TODO: Is there a maximal size for this?
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@ -115,6 +116,8 @@ static void ProcessShaderCode(VertexShaderState& state) {
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if (top.repeat_counter-- == 0) {
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state.program_counter = &shader_memory[top.return_address];
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state.call_stack.pop();
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} else {
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state.program_counter = &shader_memory[top.loop_address];
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}
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// TODO: Is "trying again" accurate to hardware?
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@ -129,7 +132,7 @@ static void ProcessShaderCode(VertexShaderState& state) {
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static auto call = [](VertexShaderState& state, u32 offset, u32 num_instructions,
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u32 return_offset, u8 repeat_count, u8 loop_increment) {
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state.program_counter = &shader_memory[offset] - 1; // -1 to make sure when incrementing the PC we end up at the correct offset
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state.call_stack.push({ offset + num_instructions, return_offset, repeat_count, loop_increment });
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state.call_stack.push({ offset + num_instructions, return_offset, repeat_count, loop_increment, offset });
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};
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u32 binary_offset = state.program_counter - shader_memory.data();
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