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graphics: simplify render target format and color mapping resolution

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This commit is contained in:
nmzik
2026-08-11 10:13:19 +02:00
parent ca7c8f0074
commit 11b95bed20
6 changed files with 355 additions and 160 deletions
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src/graphics/guest_gpu/gpu_format.cpp
+87
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@@ -3,6 +3,7 @@
#include "graphics/guest_gpu/gpu_defs.h"
#include <array>
#include <bit>
namespace Libs::Graphics::Prospero {
namespace {
@@ -64,6 +65,7 @@ constexpr FormatInfo kFormatInfo[] = {
{GpuEnumValue(BufferFormat::k9_9_9_5Float), 4, 0, 0, true, false},
{GpuEnumValue(BufferFormat::k5_6_5UNorm), 2, 0, 2, true, false},
{GpuEnumValue(BufferFormat::k5_5_5_1UNorm), 2, 0, 2, true, false},
{GpuEnumValue(BufferFormat::k1_5_5_5UNorm), 0, 0, 2, false, false},
{GpuEnumValue(BufferFormat::k4_4_4_4UNorm), 2, 0, 2, true, false},
{GpuEnumValue(BufferFormat::kFmask8_S4_F4), 1, 0, 1, true, false},
{GpuEnumValue(BufferFormat::kBc1UNorm), 0, 8, 0, true, false},
@@ -82,6 +84,68 @@ constexpr FormatInfo kFormatInfo[] = {
{GpuEnumValue(BufferFormat::kBc7Srgb), 0, 16, 0, true, false},
};
constexpr uint8_t RenderTargetTypeBit(ChannelType type) {
return static_cast<uint8_t>(1u << GpuEnumValue(type));
}
constexpr auto kUNormType = RenderTargetTypeBit(ChannelType::kUNorm);
constexpr auto kIntegerTypes =
RenderTargetTypeBit(ChannelType::kUInt) | RenderTargetTypeBit(ChannelType::kSInt);
constexpr auto kNormalizedIntegerTypes =
kUNormType | RenderTargetTypeBit(ChannelType::kSNorm) | kIntegerTypes;
struct RenderTargetLayoutInfo {
ChannelLayout layout;
BufferFormat first_linear_format;
uint8_t linear_type_mask;
uint8_t components;
BufferFormat extra_format = BufferFormat::kInvalid;
ChannelType extra_type = ChannelType::kUNorm;
ChannelOrderSupport order_support = ChannelOrderSupport::kAll;
};
constexpr RenderTargetLayoutInfo kRenderTargetLayouts[] = {
{ChannelLayout::k8, BufferFormat::k8UNorm, kNormalizedIntegerTypes, 1, BufferFormat::k8Srgb,
ChannelType::kSrgb},
{ChannelLayout::k16, BufferFormat::k16UNorm, kNormalizedIntegerTypes, 1, BufferFormat::k16Float,
ChannelType::kFloat},
{ChannelLayout::k8_8, BufferFormat::k8_8UNorm, kNormalizedIntegerTypes, 2,
BufferFormat::k8_8Srgb, ChannelType::kSrgb},
{ChannelLayout::k32, BufferFormat::k32UInt, kIntegerTypes, 1, BufferFormat::k32Float,
ChannelType::kFloat},
{ChannelLayout::k16_16, BufferFormat::k16_16UNorm, kNormalizedIntegerTypes, 2,
BufferFormat::k16_16Float, ChannelType::kFloat},
{ChannelLayout::k11_11_10, BufferFormat::k11_11_10UNorm, kNormalizedIntegerTypes, 3,
BufferFormat::k11_11_10Float, ChannelType::kFloat},
{ChannelLayout::k10_11_11, BufferFormat::k10_11_11UNorm, kNormalizedIntegerTypes, 3,
BufferFormat::k10_11_11Float, ChannelType::kFloat},
{ChannelLayout::k2_10_10_10, BufferFormat::k2_10_10_10UNorm, kNormalizedIntegerTypes, 4},
{ChannelLayout::k10_10_10_2, BufferFormat::k10_10_10_2UNorm, kNormalizedIntegerTypes, 4},
{ChannelLayout::k8_8_8_8, BufferFormat::k8_8_8_8UNorm, kNormalizedIntegerTypes, 4,
BufferFormat::k8_8_8_8Srgb, ChannelType::kSrgb},
{ChannelLayout::k32_32, BufferFormat::k32_32UInt, kIntegerTypes, 2, BufferFormat::k32_32Float,
ChannelType::kFloat},
{ChannelLayout::k16_16_16_16, BufferFormat::k16_16_16_16UNorm, kNormalizedIntegerTypes, 4,
BufferFormat::k16_16_16_16Float, ChannelType::kFloat},
{ChannelLayout::k32_32_32_32, BufferFormat::k32_32_32_32UInt, kIntegerTypes, 4,
BufferFormat::k32_32_32_32Float, ChannelType::kFloat},
{ChannelLayout::k5_6_5, BufferFormat::k5_6_5UNorm, kUNormType, 3},
{ChannelLayout::k5_5_5_1, BufferFormat::k5_5_5_1UNorm, kUNormType, 4},
{ChannelLayout::k1_5_5_5, BufferFormat::k1_5_5_5UNorm, kUNormType, 4},
{ChannelLayout::k4_4_4_4, BufferFormat::k4_4_4_4UNorm, kUNormType, 4},
{ChannelLayout::k10_10_10_2Float, BufferFormat::kInvalid, 0, 4, BufferFormat::k10_10_10_2Float,
ChannelType::kFloat, ChannelOrderSupport::kStandardOnly},
};
const RenderTargetLayoutInfo* FindRenderTargetLayout(uint32_t layout) {
for (const auto& info: kRenderTargetLayouts) {
if (GpuEnumValue(info.layout) == layout) {
return &info;
}
}
return nullptr;
}
constexpr auto MakeFormatInfoLookup() {
constexpr uint32_t kMaxFormat = GpuEnumValue(BufferFormat::kBc7Srgb);
std::array<const FormatInfo*, kMaxFormat + 1> lookup {};
@@ -99,6 +163,29 @@ const FormatInfo* FindFormatInfo(uint32_t format) {
} // namespace
RenderTargetFormatEncoding ResolveRenderTargetFormat(uint32_t layout, uint32_t type) {
const auto* layout_info = FindRenderTargetLayout(layout);
if (layout_info == nullptr || type >= 8u) {
return {};
}
const auto channel_type = static_cast<ChannelType>(type);
auto format = BufferFormat::kInvalid;
if (layout_info->extra_format != BufferFormat::kInvalid &&
channel_type == layout_info->extra_type) {
format = layout_info->extra_format;
} else if ((layout_info->linear_type_mask & (1u << type)) != 0) {
const auto first_type =
std::countr_zero(static_cast<uint32_t>(layout_info->linear_type_mask));
format = static_cast<BufferFormat>(GpuEnumValue(layout_info->first_linear_format) + type -
first_type);
}
if (format == BufferFormat::kInvalid) {
return {};
}
return {format, layout_info->components, layout_info->order_support};
}
uint32_t NumBytesPerElement(uint32_t format) {
const auto* info = FindFormatInfo(format);
return info != nullptr ? info->bytes_per_element : 0;