110 lines
4.4 KiB
C++
110 lines
4.4 KiB
C++
// Copyright 2023 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include "common/alignment.h"
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#include "common/logging/log.h"
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#include "video_core/pica/vertex_loader.h"
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namespace Pica {
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VertexLoader::VertexLoader(Memory::MemorySystem& memory_, const PipelineRegs& regs)
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: memory{memory_} {
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const auto& attribute_config = regs.vertex_attributes;
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num_total_attributes = attribute_config.GetNumTotalAttributes();
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vertex_attribute_sources.fill(0xdeadbeef);
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for (u32 i = 0; i < 16; i++) {
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vertex_attribute_is_default[i] = attribute_config.IsDefaultAttribute(i);
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}
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// Setup attribute data from loaders
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for (u32 loader = 0; loader < 12; ++loader) {
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const auto& loader_config = attribute_config.attribute_loaders[loader];
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u32 offset = 0;
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// TODO: What happens if a loader overwrites a previous one's data?
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for (u32 component = 0; component < loader_config.component_count; ++component) {
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if (component >= 12) {
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LOG_ERROR(HW_GPU,
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"Overflow in the vertex attribute loader {} trying to load component {}",
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loader, component);
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continue;
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}
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u32 attribute_index = loader_config.GetComponent(component);
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if (attribute_index < 12) {
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offset = Common::AlignUp(offset,
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attribute_config.GetElementSizeInBytes(attribute_index));
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vertex_attribute_sources[attribute_index] = loader_config.data_offset + offset;
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vertex_attribute_strides[attribute_index] =
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static_cast<u32>(loader_config.byte_count);
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vertex_attribute_formats[attribute_index] =
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attribute_config.GetFormat(attribute_index);
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vertex_attribute_elements[attribute_index] =
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attribute_config.GetNumElements(attribute_index);
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offset += attribute_config.GetStride(attribute_index);
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} else if (attribute_index < 16) {
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// Attribute ids 12, 13, 14 and 15 signify 4, 8, 12 and 16-byte paddings,
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// respectively
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offset = Common::AlignUp(offset, 4);
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offset += (attribute_index - 11) * 4;
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} else {
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UNREACHABLE(); // This is truly unreachable due to the number of bits for each
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// component
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}
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}
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}
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}
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VertexLoader::~VertexLoader() = default;
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void VertexLoader::LoadVertex(PAddr base_address, u32 index, u32 vertex, AttributeBuffer& input,
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AttributeBuffer& input_default_attributes) const {
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for (s32 i = 0; i < num_total_attributes; ++i) {
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// Load the default attribute if we're configured to do so
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if (vertex_attribute_is_default[i]) {
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input[i] = input_default_attributes[i];
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continue;
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}
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// TODO(yuriks): In this case, no data gets loaded and the vertex
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// remains with the last value it had. This isn't currently maintained
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// as global state, however, and so won't work in Citra yet.
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if (vertex_attribute_elements[i] == 0) {
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LOG_ERROR(HW_GPU, "Vertex retension unimplemented");
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continue;
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}
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// Load per-vertex data from the loader arrays
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const PAddr source_addr =
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base_address + vertex_attribute_sources[i] + vertex_attribute_strides[i] * vertex;
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switch (vertex_attribute_formats[i]) {
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case PipelineRegs::VertexAttributeFormat::BYTE:
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LoadAttribute<s8>(source_addr, i, input);
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break;
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case PipelineRegs::VertexAttributeFormat::UBYTE:
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LoadAttribute<u8>(source_addr, i, input);
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break;
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case PipelineRegs::VertexAttributeFormat::SHORT:
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LoadAttribute<s16>(source_addr, i, input);
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break;
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case PipelineRegs::VertexAttributeFormat::FLOAT:
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LoadAttribute<f32>(source_addr, i, input);
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break;
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}
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// Default attribute values set if array elements have < 4 components. This
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// is *not* carried over from the default attribute settings even if they're
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// enabled for this attribute.
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for (u32 comp = vertex_attribute_elements[i]; comp < 4; comp++) {
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input[i][comp] = comp == 3 ? f24::One() : f24::Zero();
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}
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}
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}
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} // namespace Pica
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