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A second take on HDR support with an SDR white point and HDR headroom

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This better reflects how HDR content is actually used, e.g. most content is in the SDR range, with specular highlights and bright details beyond the SDR range, in the HDR headroom.

This more closely matches how HDR is handled on Apple platforms, as EDR.

This also greatly simplifies application code which no longer has to think about color scaling. SDR content is rendered at the appropriate brightness automatically, and HDR content is scaled to the correct range for the display HDR headroom.
This commit is contained in:
Sam Lantinga
2024-02-19 08:45:02 -08:00
parent 3b7533f4a2
commit 4ba6aeee9d
24 changed files with 430 additions and 546 deletions
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10
include/SDL3/SDL_pixels.h
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@@ -576,16 +576,16 @@ typedef enum
SDL_COLOR_RANGE_FULL,
SDL_COLOR_PRIMARIES_BT709,
SDL_TRANSFER_CHARACTERISTICS_SRGB,
SDL_MATRIX_COEFFICIENTS_UNSPECIFIED,
SDL_MATRIX_COEFFICIENTS_IDENTITY,
SDL_CHROMA_LOCATION_NONE),
/* scRGB is a linear colorspace and the default colorspace for floating point surfaces */
SDL_COLORSPACE_SCRGB = /**< Equivalent to DXGI_COLOR_SPACE_RGB_FULL_G10_NONE_P709 */
/* This is a linear colorspace and the default colorspace for floating point surfaces. On Windows this is the scRGB colorspace, and on Apple platforms this is kCGColorSpaceExtendedLinearSRGB for EDR content */
SDL_COLORSPACE_SRGB_LINEAR = /**< Equivalent to DXGI_COLOR_SPACE_RGB_FULL_G10_NONE_P709 */
SDL_DEFINE_COLORSPACE(SDL_COLOR_TYPE_RGB,
SDL_COLOR_RANGE_FULL,
SDL_COLOR_PRIMARIES_BT709,
SDL_TRANSFER_CHARACTERISTICS_LINEAR,
SDL_MATRIX_COEFFICIENTS_UNSPECIFIED,
SDL_MATRIX_COEFFICIENTS_IDENTITY,
SDL_CHROMA_LOCATION_NONE),
/* HDR10 is a non-linear HDR colorspace and the default colorspace for 10-bit surfaces */
@@ -594,7 +594,7 @@ typedef enum
SDL_COLOR_RANGE_FULL,
SDL_COLOR_PRIMARIES_BT2020,
SDL_TRANSFER_CHARACTERISTICS_PQ,
SDL_MATRIX_COEFFICIENTS_UNSPECIFIED,
SDL_MATRIX_COEFFICIENTS_IDENTITY,
SDL_CHROMA_LOCATION_NONE),
SDL_COLORSPACE_JPEG = /**< Equivalent to DXGI_COLOR_SPACE_YCBCR_FULL_G22_NONE_P709_X601 */