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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_defs.h
+30 -8
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@@ -115,32 +115,52 @@ enum class ChannelOrder : uint32_t {
kAltReversed = 3,
};
// Maps a shader's logical RGBA export to the host color-attachment components. Two bits per
// component keep this cheap to carry in shader and pipeline keys.
// Selects the logical shader component written to each physical color-attachment component.
// Two bits per component keep this cheap to carry in shader and pipeline keys.
struct ColorComponentMapping {
uint8_t packed = 0xe4u; // RGBA: 0, 1, 2, 3
static constexpr uint8_t kIdentity = 0xe4u;
uint8_t packed = kIdentity;
[[nodiscard]] constexpr uint32_t Map(uint32_t component) const {
return component < 4u ? (packed >> (component * 2u)) & 0x3u : component;
}
[[nodiscard]] constexpr uint32_t ApplyMask(uint32_t mask) const {
[[nodiscard]] constexpr uint32_t ApplyMask(uint32_t logical_mask) const {
uint32_t mapped = 0;
for (uint32_t component = 0; component < 4u; component++) {
mapped |= ((mask >> component) & 1u) << Map(component);
for (uint32_t physical_component = 0; physical_component < 4u; physical_component++) {
mapped |= ((logical_mask >> Map(physical_component)) & 1u) << physical_component;
}
return mapped;
}
[[nodiscard]] constexpr bool IsIdentity() const { return packed == 0xe4u; }
// This mapping selects an intermediate component; next selects the final logical component.
[[nodiscard]] constexpr ColorComponentMapping Then(ColorComponentMapping next) const {
ColorComponentMapping result {0u};
for (uint32_t physical_component = 0; physical_component < 4u; physical_component++) {
result.packed |= static_cast<uint8_t>(next.Map(Map(physical_component))
<< (physical_component * 2u));
}
return result;
}
[[nodiscard]] constexpr bool IsIdentity() const { return packed == kIdentity; }
bool operator==(const ColorComponentMapping&) const = default;
};
static_assert(sizeof(ColorComponentMapping) == sizeof(uint8_t));
inline constexpr ColorComponentMapping ColorMappingAbgr {0x1bu}; // 3, 2, 1, 0
inline constexpr ColorComponentMapping ColorMappingRgba {ColorComponentMapping::kIdentity};
inline constexpr ColorComponentMapping ColorMappingGr {0xe1u}; // 1, 0, 2, 3
inline constexpr ColorComponentMapping ColorMappingRabg {0x6cu}; // 0, 3, 2, 1
inline constexpr ColorComponentMapping ColorMappingRgab {0xb4u}; // 0, 1, 3, 2
inline constexpr ColorComponentMapping ColorMappingBgra {0xc6u}; // 2, 1, 0, 3
inline constexpr ColorComponentMapping ColorMappingAbgr {0x1bu}; // 3, 2, 1, 0
inline constexpr ColorComponentMapping ColorMappingAgba {0x27u}; // 3, 1, 2, 0
inline constexpr ColorComponentMapping ColorMappingArbg {0x63u}; // 3, 0, 2, 1
inline constexpr ColorComponentMapping ColorMappingAgbr {0x87u}; // 3, 1, 0, 2
inline constexpr ColorComponentMapping ColorMappingArgb {0x93u}; // 3, 0, 1, 2
enum class DepthFormat : uint32_t {
kInvalid = 0,
@@ -388,9 +408,11 @@ enum class BufferFormat : uint32_t {
k8Srgb = 128,
k8_8Srgb = 129,
k8_8_8_8Srgb = 130,
k10_10_10_2Float = 131,
k9_9_9_5Float = 132,
k5_6_5UNorm = 133,
k5_5_5_1UNorm = 134,
k1_5_5_5UNorm = 135,
k4_4_4_4UNorm = 136,
kFmask8_S4_F4 = 161,
kBc1UNorm = 169,