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VideoCore/Shader: Clean up OutputVertex::FromAttributeBuffer
This also fixes a long-standing but neverthless harmless memory corruption bug, whech the padding of the OutputVertex struct would get corrupted by unused attributes.
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2 changed files with 16 additions and 10 deletions
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@ -99,7 +99,8 @@ struct Regs {
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TEXCOORD1_U = 14,
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TEXCOORD1_V = 15,
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// TODO: Not verified
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TEXCOORD0_W = 16,
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VIEW_X = 18,
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VIEW_Y = 19,
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VIEW_Z = 20,
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@ -22,23 +22,28 @@ namespace Shader {
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OutputVertex OutputVertex::FromAttributeBuffer(const Regs& regs, AttributeBuffer& input) {
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// Setup output data
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OutputVertex ret;
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union {
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OutputVertex ret{};
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std::array<float24, 24> vertex_slots;
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};
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static_assert(sizeof(vertex_slots) <= sizeof(ret), "Struct and array have different sizes.");
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unsigned int num_attributes = regs.vs_output_total;
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ASSERT(num_attributes <= 7);
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for (unsigned int i = 0; i < num_attributes; ++i) {
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const auto& output_register_map = regs.vs_output_attributes[i];
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u32 semantics[4] = {output_register_map.map_x, output_register_map.map_y,
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output_register_map.map_z, output_register_map.map_w};
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Regs::VSOutputAttributes::Semantic semantics[4] = {
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output_register_map.map_x, output_register_map.map_y, output_register_map.map_z,
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output_register_map.map_w};
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for (unsigned comp = 0; comp < 4; ++comp) {
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float24* out = ((float24*)&ret) + semantics[comp];
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if (semantics[comp] != Regs::VSOutputAttributes::INVALID) {
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Regs::VSOutputAttributes::Semantic semantic = semantics[comp];
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float24* out = &vertex_slots[semantic];
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if (semantic < vertex_slots.size()) {
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*out = input.attr[i][comp];
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} else {
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// Zero output so that attributes which aren't output won't have denormals in them,
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// which would slow us down later.
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memset(out, 0, sizeof(*out));
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} else if (semantic != Regs::VSOutputAttributes::INVALID) {
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LOG_ERROR(HW_GPU, "Invalid/unknown semantic id: %u", (unsigned int)semantic);
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}
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}
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}
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