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Generalize SDR white level handling into a color scale

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This gives applications better control over how and when light levels are adjusted when working with HDR content and display.
This commit is contained in:
Sam Lantinga
2024-02-05 23:20:43 -08:00
parent 82d89ff4fb
commit d4caef5b89
34 changed files with 3279 additions and 3234 deletions
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17
test/testcolorspace.c
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@@ -35,6 +35,8 @@ static int renderer_index = 0;
static int stage_count = 6;
static int stage_index = 0;
static int done;
static float SDR_color_scale = 1.0f;
static float HDR_color_scale = 1.0f;
static void FreeRenderer(void)
{
@@ -47,6 +49,7 @@ static void CreateRenderer(void)
{
SDL_PropertiesID props;
SDL_RendererInfo info;
float SDR_white_level;
props = SDL_CreateProperties();
SDL_SetProperty(props, SDL_PROP_RENDERER_CREATE_WINDOW_POINTER, window);
@@ -62,6 +65,16 @@ static void CreateRenderer(void)
SDL_GetRendererInfo(renderer, &info);
SDL_Log("Created renderer %s\n", info.name);
renderer_name = info.name;
/* If HDR is enabled... */
if (colorspace == SDL_COLORSPACE_SCRGB) {
SDR_white_level = 200.0f;
} else {
SDR_white_level = 80.0f;
}
SDR_color_scale = SDR_white_level / 80.0f;
SDL_SetRenderColorScale(renderer, SDR_color_scale);
}
static void NextRenderer( void )
@@ -429,7 +442,9 @@ static void RenderGradientDrawing(void)
DrawTextWhite(x, y, "HDR gradient (%d nits)", 400);
y += TEXT_LINE_ADVANCE;
SDL_SetRenderColorScale(renderer, HDR_color_scale);
DrawGradient(x, y, WINDOW_WIDTH - 2 * x, 64.0f, 0.0f, sRGBfromNits(400.0f));
SDL_SetRenderColorScale(renderer, SDR_color_scale);
y += 64.0f;
y += TEXT_LINE_ADVANCE;
@@ -437,7 +452,9 @@ static void RenderGradientDrawing(void)
DrawTextWhite(x, y, "HDR gradient (%d nits)", 1000);
y += TEXT_LINE_ADVANCE;
SDL_SetRenderColorScale(renderer, HDR_color_scale);
DrawGradient(x, y, WINDOW_WIDTH - 2 * x, 64.0f, 0.0f, sRGBfromNits(1000));
SDL_SetRenderColorScale(renderer, SDR_color_scale);
y += 64.0f;
}