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// Copyright 2008 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "VideoCommon/VertexLoader_TextCoord.h"
#include <type_traits>
#include "Common/CommonTypes.h"
#include "Common/Swap.h"
#include "VideoCommon/DataReader.h"
#include "VideoCommon/VertexLoader.h"
#include "VideoCommon/VertexLoaderManager.h"
#include "VideoCommon/VertexLoaderUtils.h"
namespace
{
void TexCoord_Read_Dummy(VertexLoader* loader)
{
loader->m_tcIndex++;
}
template <typename T>
constexpr float TCScale(T val, float scale)
{
return val * scale;
}
template <>
constexpr float TCScale(float val, [[maybe_unused]] float scale)
{
return val;
}
template <typename T, int N>
void TexCoord_ReadDirect(VertexLoader* loader)
{
const auto scale = loader->m_tcScale[loader->m_tcIndex];
DataReader dst(g_vertex_manager_write_ptr, nullptr);
DataReader src(g_video_buffer_read_ptr, nullptr);
for (int i = 0; i != N; ++i)
dst.Write(TCScale(src.Read<T>(), scale));
g_vertex_manager_write_ptr = dst.GetPointer();
g_video_buffer_read_ptr = src.GetPointer();
++loader->m_tcIndex;
}
template <typename I, typename T, int N>
void TexCoord_ReadIndex(VertexLoader* loader)
{
static_assert(std::is_unsigned<I>::value, "Only unsigned I is sane!");
const auto index = DataRead<I>();
const auto data = reinterpret_cast<const T*>(
VertexLoaderManager::cached_arraybases[CPArray::TexCoord0 + loader->m_tcIndex] +
(index * g_main_cp_state.array_strides[CPArray::TexCoord0 + loader->m_tcIndex]));
const auto scale = loader->m_tcScale[loader->m_tcIndex];
DataReader dst(g_vertex_manager_write_ptr, nullptr);
for (int i = 0; i != N; ++i)
dst.Write(TCScale(Common::FromBigEndian(data[i]), scale));
g_vertex_manager_write_ptr = dst.GetPointer();
++loader->m_tcIndex;
}
using Common::EnumMap;
// These functions are to work around a "too many initializer values" error with nested brackets
// C++ does not let you write std::array<std::array<u32, 2>, 2> a = {{1, 2}, {3, 4}}
// (although it does allow std::array<std::array<u32, 2>, 2> b = {1, 2, 3, 4})
constexpr EnumMap<TPipelineFunction, TexComponentCount::ST> e(TPipelineFunction s,
TPipelineFunction st)
{
return {s, st};
}
constexpr EnumMap<u32, TexComponentCount::ST> e(u32 s, u32 st)
{
return {s, st};
}
constexpr EnumMap<EnumMap<TPipelineFunction, TexComponentCount::ST>, ComponentFormat::Float>
f(EnumMap<EnumMap<TPipelineFunction, TexComponentCount::ST>, ComponentFormat::Float> in)
{
return in;
}
constexpr EnumMap<EnumMap<u32, TexComponentCount::ST>, ComponentFormat::Float>
g(EnumMap<EnumMap<u32, TexComponentCount::ST>, ComponentFormat::Float> in)
{
return in;
}
template <typename T>
using Table = EnumMap<EnumMap<EnumMap<T, TexComponentCount::ST>, ComponentFormat::Float>,
VertexComponentFormat::Index16>;
constexpr Table<TPipelineFunction> s_table_read_tex_coord = {
f({
e(nullptr, nullptr),
e(nullptr, nullptr),
e(nullptr, nullptr),
e(nullptr, nullptr),
e(nullptr, nullptr),
}),
f({
e(TexCoord_ReadDirect<u8, 1>, TexCoord_ReadDirect<u8, 2>),
e(TexCoord_ReadDirect<s8, 1>, TexCoord_ReadDirect<s8, 2>),
e(TexCoord_ReadDirect<u16, 1>, TexCoord_ReadDirect<u16, 2>),
e(TexCoord_ReadDirect<s16, 1>, TexCoord_ReadDirect<s16, 2>),
e(TexCoord_ReadDirect<float, 1>, TexCoord_ReadDirect<float, 2>),
}),
f({
e(TexCoord_ReadIndex<u8, u8, 1>, TexCoord_ReadIndex<u8, u8, 2>),
e(TexCoord_ReadIndex<u8, s8, 1>, TexCoord_ReadIndex<u8, s8, 2>),
e(TexCoord_ReadIndex<u8, u16, 1>, TexCoord_ReadIndex<u8, u16, 2>),
e(TexCoord_ReadIndex<u8, s16, 1>, TexCoord_ReadIndex<u8, s16, 2>),
e(TexCoord_ReadIndex<u8, float, 1>, TexCoord_ReadIndex<u8, float, 2>),
}),
f({
e(TexCoord_ReadIndex<u16, u8, 1>, TexCoord_ReadIndex<u16, u8, 2>),
e(TexCoord_ReadIndex<u16, s8, 1>, TexCoord_ReadIndex<u16, s8, 2>),
e(TexCoord_ReadIndex<u16, u16, 1>, TexCoord_ReadIndex<u16, u16, 2>),
e(TexCoord_ReadIndex<u16, s16, 1>, TexCoord_ReadIndex<u16, s16, 2>),
e(TexCoord_ReadIndex<u16, float, 1>, TexCoord_ReadIndex<u16, float, 2>),
}),
};
} // Anonymous namespace
TPipelineFunction VertexLoader_TextCoord::GetFunction(VertexComponentFormat type,
ComponentFormat format,
TexComponentCount elements)
{
return s_table_read_tex_coord[type][format][elements];
}
TPipelineFunction VertexLoader_TextCoord::GetDummyFunction()
{
return TexCoord_Read_Dummy;
}
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