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Added HDR display properties and related event

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Also added an HDR calibration stage to testcolorspace
This commit is contained in:
Sam Lantinga 2024-02-06 01:53:03 -08:00
parent d4caef5b89
commit 30e176d6ba
11 changed files with 510 additions and 57 deletions
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266
test/testcolorspace.c
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@ -18,6 +18,18 @@
#include <emscripten/emscripten.h>
#endif
/* The value for the SDR white level on an SDR display, scRGB 1.0 */
#define SDR_DISPLAY_WHITE_LEVEL 80.0f
/* The default value for the SDR white level on an HDR display */
#define DEFAULT_SDR_WHITE_LEVEL 200.0f
/* The default value for the HDR white level on an HDR display */
#define DEFAULT_HDR_WHITE_LEVEL 400.0f
/* The maximum value for the HDR white level on an HDR display */
#define MAXIMUM_HDR_WHITE_LEVEL 1000.0f
#define WINDOW_WIDTH 640
#define WINDOW_HEIGHT 480
@ -32,11 +44,27 @@ static SDL_Colorspace colorspace = SDL_COLORSPACE_SRGB;
static const char *colorspace_name = "sRGB";
static int renderer_count = 0;
static int renderer_index = 0;
static int stage_count = 6;
static int stage_index = 0;
static int done;
static SDL_bool HDR_enabled = SDL_FALSE;
static float SDR_white_level = SDR_DISPLAY_WHITE_LEVEL;
static float SDR_color_scale = 1.0f;
static float HDR_color_scale = 1.0f;
static SDL_FRect SDR_calibration_rect;
static float HDR_white_level = DEFAULT_HDR_WHITE_LEVEL;
static float HDR_color_scale = DEFAULT_HDR_WHITE_LEVEL / SDR_DISPLAY_WHITE_LEVEL;
static SDL_FRect HDR_calibration_rect;
enum
{
StageClearBackground,
StageDrawBackground,
StageBlendDrawing,
StageBlendTexture,
StageHDRCalibration,
StageGradientDrawing,
StageGradientTexture,
StageCount
};
static void FreeRenderer(void)
{
@ -45,11 +73,61 @@ static void FreeRenderer(void)
renderer = NULL;
}
static float GetDisplaySDRWhiteLevel(void)
{
SDL_PropertiesID props;
HDR_enabled = SDL_FALSE;
props = SDL_GetRendererProperties(renderer);
if (SDL_GetNumberProperty(props, SDL_PROP_RENDERER_OUTPUT_COLORSPACE_NUMBER, SDL_COLORSPACE_SRGB) != SDL_COLORSPACE_SCRGB) {
/* We're not displaying in HDR, use the SDR white level */
return SDR_DISPLAY_WHITE_LEVEL;
}
props = SDL_GetDisplayProperties(SDL_GetDisplayForWindow(window));
if (!SDL_GetBooleanProperty(props, SDL_PROP_DISPLAY_HDR_ENABLED_BOOLEAN, SDL_FALSE)) {
/* HDR is not enabled on the display */
return SDR_DISPLAY_WHITE_LEVEL;
}
HDR_enabled = SDL_TRUE;
return SDL_GetFloatProperty(props, SDL_PROP_DISPLAY_SDR_WHITE_LEVEL_FLOAT, DEFAULT_SDR_WHITE_LEVEL);
}
static void SetSDRWhiteLevel(float value)
{
if (value == SDR_white_level) {
return;
}
SDL_Log("SDR white level set to %g nits\n", value);
SDR_white_level = value;
SDR_color_scale = SDR_white_level / SDR_DISPLAY_WHITE_LEVEL;
SDL_SetRenderColorScale(renderer, SDR_color_scale);
}
static void UpdateSDRWhiteLevel(void)
{
SetSDRWhiteLevel(GetDisplaySDRWhiteLevel());
}
static void SetHDRWhiteLevel(float value)
{
if (value == HDR_white_level) {
return;
}
SDL_Log("HDR white level set to %g nits\n", value);
HDR_white_level = value;
HDR_color_scale = HDR_white_level / SDR_DISPLAY_WHITE_LEVEL;
}
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);
@ -66,15 +144,7 @@ static void CreateRenderer(void)
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);
UpdateSDRWhiteLevel();
}
static void NextRenderer( void )
@ -107,12 +177,12 @@ static void PrevRenderer(void)
static void NextStage(void)
{
if (stage_count <= 0) {
if (StageCount <= 0) {
return;
}
++stage_index;
if (stage_index == stage_count) {
if (stage_index == StageCount) {
stage_index = 0;
}
}
@ -121,7 +191,7 @@ static void PrevStage(void)
{
--stage_index;
if (stage_index == -1) {
stage_index += stage_count;
stage_index += StageCount;
}
}
@ -388,6 +458,11 @@ static void DrawGradient(float x, float y, float width, float height, float star
SDL_RenderGeometryRaw(renderer, NULL, xy, xy_stride, color, color_stride, NULL, 0, num_vertices, indices, num_indices, size_indices);
}
static float scRGBtoNits(float v)
{
return v * 80.0f;
}
static float scRGBfromNits(float v)
{
return v / 80.0f;
@ -413,6 +488,11 @@ static float sRGBFromLinear(float v)
return v;
}
static float sRGBtoNits(float v)
{
return scRGBtoNits(sRGBtoLinear(v));
}
static float sRGBfromNits(float v)
{
return sRGBFromLinear(scRGBfromNits(v));
@ -432,28 +512,30 @@ static void RenderGradientDrawing(void)
y += TEXT_LINE_ADVANCE;
DrawTextWhite(x, y, "SDR gradient (%d nits)", 80);
DrawTextWhite(x, y, "SDR gradient (%g nits)", SDR_white_level);
y += TEXT_LINE_ADVANCE;
DrawGradient(x, y, WINDOW_WIDTH - 2 * x, 64.0f, 0.0f, sRGBfromNits(80.0f));
y += 64.0f;
y += TEXT_LINE_ADVANCE;
y += TEXT_LINE_ADVANCE;
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, 1.0f);
DrawGradient(x, y, WINDOW_WIDTH - 2 * x, 64.0f, 0.0f, sRGBfromNits(SDR_white_level));
SDL_SetRenderColorScale(renderer, SDR_color_scale);
y += 64.0f;
y += TEXT_LINE_ADVANCE;
y += TEXT_LINE_ADVANCE;
DrawTextWhite(x, y, "HDR gradient (%d nits)", 1000);
DrawTextWhite(x, y, "HDR gradient (%g nits)", HDR_white_level);
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, 1.0f);
DrawGradient(x, y, WINDOW_WIDTH - 2 * x, 64.0f, 0.0f, sRGBfromNits(HDR_white_level));
SDL_SetRenderColorScale(renderer, SDR_color_scale);
y += 64.0f;
y += TEXT_LINE_ADVANCE;
y += TEXT_LINE_ADVANCE;
DrawTextWhite(x, y, "HDR gradient (%g nits)", MAXIMUM_HDR_WHITE_LEVEL);
y += TEXT_LINE_ADVANCE;
SDL_SetRenderColorScale(renderer, 1.0f);
DrawGradient(x, y, WINDOW_WIDTH - 2 * x, 64.0f, 0.0f, sRGBfromNits(MAXIMUM_HDR_WHITE_LEVEL));
SDL_SetRenderColorScale(renderer, SDR_color_scale);
y += 64.0f;
}
@ -517,28 +599,119 @@ static void RenderGradientTexture(void)
y += TEXT_LINE_ADVANCE;
DrawTextWhite(x, y, "SDR gradient (%d nits)", 80);
DrawTextWhite(x, y, "SDR gradient (%g nits)", SDR_white_level);
y += TEXT_LINE_ADVANCE;
DrawGradientTexture(x, y, WINDOW_WIDTH - 2 * x, 64.0f, 0.0f, sRGBfromNits(80));
SDL_SetRenderColorScale(renderer, 1.0f);
DrawGradientTexture(x, y, WINDOW_WIDTH - 2 * x, 64.0f, 0.0f, sRGBfromNits(SDR_white_level));
SDL_SetRenderColorScale(renderer, SDR_color_scale);
y += 64.0f;
y += TEXT_LINE_ADVANCE;
y += TEXT_LINE_ADVANCE;
DrawTextWhite(x, y, "HDR gradient (%d nits)", 400);
DrawTextWhite(x, y, "HDR gradient (%g nits)", HDR_white_level);
y += TEXT_LINE_ADVANCE;
DrawGradientTexture(x, y, WINDOW_WIDTH - 2 * x, 64.0f, 0.0f, sRGBfromNits(400));
SDL_SetRenderColorScale(renderer, 1.0f);
DrawGradientTexture(x, y, WINDOW_WIDTH - 2 * x, 64.0f, 0.0f, sRGBfromNits(HDR_white_level));
SDL_SetRenderColorScale(renderer, SDR_color_scale);
y += 64.0f;
y += TEXT_LINE_ADVANCE;
y += TEXT_LINE_ADVANCE;
DrawTextWhite(x, y, "HDR gradient (%d nits)", 1000);
DrawTextWhite(x, y, "HDR gradient (%g nits)", MAXIMUM_HDR_WHITE_LEVEL);
y += TEXT_LINE_ADVANCE;
DrawGradientTexture(x, y, WINDOW_WIDTH - 2 * x, 64.0f, 0.0f, sRGBfromNits(1000));
SDL_SetRenderColorScale(renderer, 1.0f);
DrawGradientTexture(x, y, WINDOW_WIDTH - 2 * x, 64.0f, 0.0f, sRGBfromNits(MAXIMUM_HDR_WHITE_LEVEL));
SDL_SetRenderColorScale(renderer, SDR_color_scale);
y += 64.0f;
}
static void RenderHDRCalibration(void)
{
SDL_FRect rect;
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderClear(renderer);
float x = TEXT_START_X;
float y = TEXT_START_Y;
DrawTextWhite(x, y, "%s %s", renderer_name, colorspace_name);
y += TEXT_LINE_ADVANCE;
DrawTextWhite(x, y, "Test: HDR calibration");
y += TEXT_LINE_ADVANCE;
y += TEXT_LINE_ADVANCE;
if (!HDR_enabled) {
DrawTextWhite(x, y, "HDR not enabled");
return;
}
DrawTextWhite(x, y, "Select HDR maximum brightness (%g nits)", HDR_white_level);
y += TEXT_LINE_ADVANCE;
DrawTextWhite(x, y, "The square in the middle should just barely be visible");
y += TEXT_LINE_ADVANCE;
HDR_calibration_rect.x = x;
HDR_calibration_rect.y = y;
HDR_calibration_rect.w = WINDOW_WIDTH - 2 * x;
HDR_calibration_rect.h = 64.0f;
SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
SDL_SetRenderColorScale(renderer, MAXIMUM_HDR_WHITE_LEVEL / SDR_DISPLAY_WHITE_LEVEL);
SDL_RenderFillRect(renderer, &HDR_calibration_rect);
SDL_SetRenderColorScale(renderer, HDR_color_scale);
rect = HDR_calibration_rect;
rect.h -= 4.0f;
rect.w = 60.0f;
rect.x = (WINDOW_WIDTH - rect.w) / 2.0f;
rect.y += 2.0f;
SDL_RenderFillRect(renderer, &rect);
SDL_SetRenderColorScale(renderer, SDR_color_scale);
y += 64.0f;
y += TEXT_LINE_ADVANCE;
y += TEXT_LINE_ADVANCE;
DrawTextWhite(x, y, "Select SDR maximum brightness (%g nits)", SDR_white_level);
y += TEXT_LINE_ADVANCE;
SDR_calibration_rect.x = x;
SDR_calibration_rect.y = y;
SDR_calibration_rect.w = WINDOW_WIDTH - 2 * x;
SDR_calibration_rect.h = 64.0f;
SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255);
SDL_RenderFillRect(renderer, &SDR_calibration_rect);
}
static void OnHDRCalibrationMouseHeld(float x, float y)
{
SDL_FPoint mouse = { x, y };
if (SDL_PointInRectFloat(&mouse, &HDR_calibration_rect)) {
float v = (x - HDR_calibration_rect.x) / HDR_calibration_rect.w;
v *= (sRGBfromNits(MAXIMUM_HDR_WHITE_LEVEL) - 1.0f);
v += 1.0f;
v = sRGBtoNits(v);
SetHDRWhiteLevel(v);
return;
}
if (SDL_PointInRectFloat(&mouse, &SDR_calibration_rect)) {
float v = (x - SDR_calibration_rect.x) / SDR_calibration_rect.w;
v *= (sRGBfromNits(MAXIMUM_HDR_WHITE_LEVEL) - 1.0f);
v += 1.0f;
v = sRGBtoNits(v);
SetSDRWhiteLevel(v);
return;
}
}
static void OnMouseHeld(float x, float y)
{
if (stage_index == StageHDRCalibration) {
OnHDRCalibrationMouseHeld(x, y);
}
}
static void loop(void)
{
SDL_Event event;
@ -565,6 +738,14 @@ static void loop(void)
default:
break;
}
} else if (event.type == SDL_EVENT_MOUSE_BUTTON_DOWN) {
OnMouseHeld(event.button.x, event.button.y);
} else if (event.type == SDL_EVENT_MOUSE_MOTION) {
if (event.motion.state) {
OnMouseHeld(event.button.x, event.button.y);
}
} else if (event.type == SDL_EVENT_DISPLAY_HDR_STATE_CHANGED) {
UpdateSDRWhiteLevel();
} else if (event.type == SDL_EVENT_QUIT) {
done = 1;
}
@ -575,22 +756,25 @@ static void loop(void)
SDL_RenderClear(renderer);
switch (stage_index) {
case 0:
case StageClearBackground:
RenderClearBackground();
break;
case 1:
case StageDrawBackground:
RenderDrawBackground();
break;
case 2:
case StageBlendDrawing:
RenderBlendDrawing();
break;
case 3:
case StageBlendTexture:
RenderBlendTexture();
break;
case 4:
case StageHDRCalibration:
RenderHDRCalibration();
break;
case StageGradientDrawing:
RenderGradientDrawing();
break;
case 5:
case StageGradientTexture:
RenderGradientTexture();
break;
}