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Added texture colorspace testing

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This commit is contained in:
Sam Lantinga 2024-09-11 12:54:07 -07:00
parent 86e393b523
commit 4e43da684c
1 changed files with 95 additions and 0 deletions
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95
test/testcolorspace.c
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@ -40,6 +40,8 @@ enum
{
StageClearBackground,
StageDrawBackground,
StageTextureBackground,
StageTargetBackground,
StageBlendDrawing,
StageBlendTexture,
StageGradientDrawing,
@ -239,6 +241,93 @@ static void RenderDrawBackground(void)
}
}
static SDL_Texture *CreateGrayTexture(void)
{
SDL_Texture *texture;
Uint8 pixels[4];
/* Floating point textures are in the linear colorspace by default */
texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA32, SDL_TEXTUREACCESS_STATIC, 1, 1);
if (!texture) {
return NULL;
}
pixels[0] = 128;
pixels[1] = 128;
pixels[2] = 128;
pixels[3] = 255;
SDL_UpdateTexture(texture, NULL, pixels, sizeof(pixels));
return texture;
}
static void RenderTextureBackground(void)
{
/* Fill the background with a 50% gray texture.
* This will be darker when using sRGB colors and lighter using linear colors
*/
SDL_Texture *texture = CreateGrayTexture();
SDL_RenderTexture(renderer, texture, NULL, NULL);
SDL_DestroyTexture(texture);
/* Check the renderered pixels */
SDL_Color c;
if (!ReadPixel(0, 0, &c)) {
return;
}
float x = TEXT_START_X;
float y = TEXT_START_Y;
DrawText(x, y, "%s %s", renderer_name, colorspace_name);
y += TEXT_LINE_ADVANCE;
DrawText(x, y, "Test: Fill 50%% Gray Texture");
y += TEXT_LINE_ADVANCE;
DrawText(x, y, "Background color written: 0x808080, read: 0x%.2x%.2x%.2x", c.r, c.g, c.b);
y += TEXT_LINE_ADVANCE;
if (c.r != 128) {
DrawText(x, y, "Incorrect background color, unknown reason");
y += TEXT_LINE_ADVANCE;
}
}
static void RenderTargetBackground(void)
{
/* Fill the background with a 50% gray texture.
* This will be darker when using sRGB colors and lighter using linear colors
*/
SDL_Texture *target = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA32, SDL_TEXTUREACCESS_TARGET, 1, 1);
SDL_Texture *texture = CreateGrayTexture();
/* Fill the render target with the gray texture */
SDL_SetRenderTarget(renderer, target);
SDL_RenderTexture(renderer, texture, NULL, NULL);
SDL_DestroyTexture(texture);
/* Fill the output with the render target */
SDL_SetRenderTarget(renderer, NULL);
SDL_RenderTexture(renderer, target, NULL, NULL);
SDL_DestroyTexture(target);
/* Check the renderered pixels */
SDL_Color c;
if (!ReadPixel(0, 0, &c)) {
return;
}
float x = TEXT_START_X;
float y = TEXT_START_Y;
DrawText(x, y, "%s %s", renderer_name, colorspace_name);
y += TEXT_LINE_ADVANCE;
DrawText(x, y, "Test: Fill 50%% Gray Render Target");
y += TEXT_LINE_ADVANCE;
DrawText(x, y, "Background color written: 0x808080, read: 0x%.2x%.2x%.2x", c.r, c.g, c.b);
y += TEXT_LINE_ADVANCE;
if (c.r != 128) {
DrawText(x, y, "Incorrect background color, unknown reason");
y += TEXT_LINE_ADVANCE;
}
}
static void RenderBlendDrawing(void)
{
SDL_Color a = { 238, 70, 166, 255 }; /* red square */
@ -541,6 +630,12 @@ static void loop(void)
case StageDrawBackground:
RenderDrawBackground();
break;
case StageTextureBackground:
RenderTextureBackground();
break;
case StageTargetBackground:
RenderTargetBackground();
break;
case StageBlendDrawing:
RenderBlendDrawing();
break;