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Added the concept of colorspace to the SDL renderer

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This allows color operations to happen in linear space between sRGB input and sRGB output. This is currently supported on the direct3d11, direct3d12 and opengl renderers.

This is a good resource on blending in linear space vs sRGB space:
https://blog.johnnovak.net/2016/09/21/what-every-coder-should-know-about-gamma/

Also added testcolorspace to verify colorspace changes
This commit is contained in:
Sam Lantinga 2024-01-29 18:32:27 -08:00
parent 554f0625d3
commit f257eb4481
9 changed files with 648 additions and 40 deletions
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12
src/render/SDL_sysrender.h
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@ -63,6 +63,7 @@ typedef struct SDL_RenderViewState
struct SDL_Texture
{
const void *magic;
SDL_Colorspace colorspace; /**< The colorspace of the texture */
Uint32 format; /**< The pixel format of the texture */
int access; /**< SDL_TextureAccess */
int w; /**< The width of the texture */
@ -249,6 +250,10 @@ struct SDL_Renderer
SDL_Texture *target;
SDL_Mutex *target_mutex;
SDL_Colorspace input_colorspace;
SDL_Colorspace output_colorspace;
SDL_bool colorspace_conversion;
SDL_FColor color; /**< Color for drawing operations values */
SDL_BlendMode blendMode; /**< The drawing blend mode */
@ -294,6 +299,13 @@ extern SDL_RenderDriver PSP_RenderDriver;
extern SDL_RenderDriver SW_RenderDriver;
extern SDL_RenderDriver VITA_GXM_RenderDriver;
/* Setup colorspace conversion */
extern void SDL_SetupRendererColorspace(SDL_Renderer *renderer, SDL_PropertiesID props);
/* Colorspace conversion functions */
extern void SDL_ConvertToLinear(SDL_Renderer *renderer, SDL_FColor *color);
extern void SDL_ConvertFromLinear(SDL_Renderer *renderer, SDL_FColor *color);
/* Blend mode functions */
extern SDL_BlendFactor SDL_GetBlendModeSrcColorFactor(SDL_BlendMode blendMode);
extern SDL_BlendFactor SDL_GetBlendModeDstColorFactor(SDL_BlendMode blendMode);