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testautomation: added tests to cover linear <-> sRGB colorspace conversion

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This commit is contained in:
Sam Lantinga
2025-11-10 13:33:50 -08:00
parent 33c70af2f8
commit eccd5c03c3
1 changed files with 207 additions and 0 deletions
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207
test/testautomation_render.c
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@@ -2102,6 +2102,203 @@ static int SDLCALL render_testTextureState(void *arg)
return TEST_COMPLETED;
}
static void CheckUniformColor(float expected)
{
SDL_Surface *surface = SDL_RenderReadPixels(renderer, NULL);
if (surface) {
const float epsilon = 0.0001f;
float r, g, b, a;
CHECK_FUNC(SDL_ReadSurfacePixelFloat, (surface, 0, 0, &r, &g, &b, &a));
SDLTest_AssertCheck(
SDL_fabs(r - expected) <= epsilon &&
SDL_fabs(g - expected) <= epsilon &&
SDL_fabs(b - expected) <= epsilon &&
a == 1.0f,
"Check color, expected %g,%g,%g,%g, got %g,%g,%g,%g",
expected, expected, expected, 1.0f, r, g, b, a);
SDL_DestroySurface(surface);
} else {
SDLTest_AssertCheck(surface != NULL, "Validate result from SDL_RenderReadPixels, got NULL, %s", SDL_GetError());
}
}
/**
* Tests colorspace support (sRGB -> linear)
*/
static int SDLCALL render_testColorspaceLinear(void *arg)
{
SDL_PropertiesID props;
SDL_Texture *texture;
Uint32 pixel = 0xFF404040;
SDL_DestroyRenderer(renderer);
props = SDL_CreateProperties();
SDL_SetPointerProperty(props, SDL_PROP_RENDERER_CREATE_WINDOW_POINTER, window);
SDL_SetNumberProperty(props, SDL_PROP_RENDERER_CREATE_OUTPUT_COLORSPACE_NUMBER, SDL_COLORSPACE_SRGB_LINEAR);
renderer = SDL_CreateRendererWithProperties(props);
SDL_DestroyProperties(props);
if (!renderer) {
SDLTest_Log("Skipping test render_testColorspaceLinear, couldn't create a linear colorspace renderer");
return TEST_SKIPPED;
}
/* Verify conversion between sRGB and linear colorspaces */
texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STATIC, 1, 1);
SDLTest_AssertPass("Create texture");
SDLTest_AssertCheck(texture != NULL, "Check SDL_CreateTexture result");
CHECK_FUNC(SDL_UpdateTexture, (texture, NULL, &pixel, sizeof(pixel)));
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0, 0, 0, 255));
CHECK_FUNC(SDL_RenderClear, (renderer));
CheckUniformColor(0.0f);
SDLTest_AssertPass("Checking sRGB clear 0x40");
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0x40, 0x40, 0x40, 255));
CHECK_FUNC(SDL_RenderClear, (renderer));
CheckUniformColor(0.0512695f);
/* Clear target to 0 */
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0, 0, 0, 255));
CHECK_FUNC(SDL_RenderClear, (renderer));
SDLTest_AssertPass("Checking sRGB draw 0x40");
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0x40, 0x40, 0x40, 255));
CHECK_FUNC(SDL_RenderPoint, (renderer, 0.0f, 0.0f));
CheckUniformColor(0.0512695f);
/* Clear target to 0 */
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0, 0, 0, 255));
CHECK_FUNC(SDL_RenderClear, (renderer));
SDLTest_AssertPass("Checking sRGB texture 0x40");
CHECK_FUNC(SDL_RenderTexture, (renderer, texture, NULL, NULL));
CheckUniformColor(0.0512695f);
/* Clear target to 0 */
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0, 0, 0, 255));
CHECK_FUNC(SDL_RenderClear, (renderer));
SDL_SetRenderColorScale(renderer, 2.0f);
SDLTest_AssertPass("Checking sRGB clear 0x40 with color scale 2.0");
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0x40, 0x40, 0x40, 255));
CHECK_FUNC(SDL_RenderClear, (renderer));
CheckUniformColor(0.102478f);
/* Clear target to 0 */
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0, 0, 0, 255));
CHECK_FUNC(SDL_RenderClear, (renderer));
SDLTest_AssertPass("Checking sRGB draw 0x40 with color scale 2.0f");
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0x40, 0x40, 0x40, 255));
CHECK_FUNC(SDL_RenderPoint, (renderer, 0.0f, 0.0f));
CheckUniformColor(0.102478f);
/* Clear target to 0 */
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0, 0, 0, 255));
CHECK_FUNC(SDL_RenderClear, (renderer));
SDLTest_AssertPass("Checking sRGB texture 0x40 with color scale 2.0f");
CHECK_FUNC(SDL_RenderTexture, (renderer, texture, NULL, NULL));
CheckUniformColor(0.102478f);
SDL_DestroyTexture(texture);
return TEST_COMPLETED;
}
/**
* Tests colorspace support (linear -> sRGB)
*/
static int SDLCALL render_testColorspaceSRGB(void *arg)
{
bool supports_float_textures;
const SDL_PixelFormat *texture_formats;
int i;
SDL_Texture *texture;
float pixel[4] = { 0.25f, 0.25f, 0.25f, 1.0f };
supports_float_textures = false;
texture_formats = (const SDL_PixelFormat *)SDL_GetPointerProperty(SDL_GetRendererProperties(renderer), SDL_PROP_RENDERER_TEXTURE_FORMATS_POINTER, NULL);
if (texture_formats) {
for (i = 0; texture_formats[i] != SDL_PIXELFORMAT_UNKNOWN; ++i) {
if (SDL_ISPIXELFORMAT_FLOAT(texture_formats[i])) {
supports_float_textures = true;
break;
}
}
}
if (!supports_float_textures) {
SDLTest_Log("Skipping test render_testColorspaceSRGB, renderer doesn't support float textures");
return TEST_SKIPPED;
}
/* Verify conversion between sRGB and linear colorspaces */
texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA128_FLOAT, SDL_TEXTUREACCESS_STATIC, 1, 1);
SDLTest_AssertPass("Create texture");
SDLTest_AssertCheck(texture != NULL, "Check SDL_CreateTexture result");
CHECK_FUNC(SDL_UpdateTexture, (texture, NULL, &pixel, sizeof(pixel)));
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0, 0, 0, 255));
CHECK_FUNC(SDL_RenderClear, (renderer));
CheckUniformColor(0.0f);
SDLTest_AssertPass("Checking sRGB clear 0x40");
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0x40, 0x40, 0x40, 255));
CHECK_FUNC(SDL_RenderClear, (renderer));
CheckUniformColor(0.25098f);
/* Clear target to 0 */
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0, 0, 0, 255));
CHECK_FUNC(SDL_RenderClear, (renderer));
SDLTest_AssertPass("Checking sRGB draw 0x40");
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0x40, 0x40, 0x40, 255));
CHECK_FUNC(SDL_RenderPoint, (renderer, 0.0f, 0.0f));
CheckUniformColor(0.25098f);
/* Clear target to 0 */
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0, 0, 0, 255));
CHECK_FUNC(SDL_RenderClear, (renderer));
SDLTest_AssertPass("Checking linear texture 0.25");
CHECK_FUNC(SDL_RenderTexture, (renderer, texture, NULL, NULL));
CheckUniformColor(0.537255f);
/* Clear target to 0 */
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0, 0, 0, 255));
CHECK_FUNC(SDL_RenderClear, (renderer));
SDL_SetRenderColorScale(renderer, 2.0f);
SDLTest_AssertPass("Checking sRGB clear 0x40 with color scale 2.0");
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0x40, 0x40, 0x40, 255));
CHECK_FUNC(SDL_RenderClear, (renderer));
CheckUniformColor(0.501961f);
/* Clear target to 0 */
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0, 0, 0, 255));
CHECK_FUNC(SDL_RenderClear, (renderer));
SDLTest_AssertPass("Checking sRGB draw 0x40 with color scale 2.0f");
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0x40, 0x40, 0x40, 255));
CHECK_FUNC(SDL_RenderPoint, (renderer, 0.0f, 0.0f));
CheckUniformColor(0.501961f);
/* Clear target to 0 */
CHECK_FUNC(SDL_SetRenderDrawColor, (renderer, 0, 0, 0, 255));
CHECK_FUNC(SDL_RenderClear, (renderer));
SDLTest_AssertPass("Checking linear texture 0.25 with color scale 2.0f");
CHECK_FUNC(SDL_RenderTexture, (renderer, texture, NULL, NULL));
CheckUniformColor(0.737255f);
SDL_DestroyTexture(texture);
return TEST_COMPLETED;
}
/* ================= Test References ================== */
/* Render test cases */
@@ -2173,6 +2370,14 @@ static const SDLTest_TestCaseReference renderTestRGBSurfaceNoAlpha = {
render_testRGBSurfaceNoAlpha, "render_testRGBSurfaceNoAlpha", "Tests RGB surface with no alpha using software renderer", TEST_ENABLED
};
static const SDLTest_TestCaseReference renderTestColorspaceLinear = {
render_testColorspaceLinear, "render_testColorspaceLinear", "Tests colorspace support (sRGB -> linear)", TEST_ENABLED
};
static const SDLTest_TestCaseReference renderTestColorspaceSRGB = {
render_testColorspaceSRGB, "render_testColorspaceSRGB", "Tests colorspace support (linear -> sRGB)", TEST_ENABLED
};
/* Sequence of Render test cases */
static const SDLTest_TestCaseReference *renderTests[] = {
&renderTestGetNumRenderDrivers,
@@ -2192,6 +2397,8 @@ static const SDLTest_TestCaseReference *renderTests[] = {
&renderTestTextureState,
&renderTestGetSetTextureScaleMode,
&renderTestRGBSurfaceNoAlpha,
&renderTestColorspaceLinear,
&renderTestColorspaceSRGB,
NULL
};