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wg_engine: fix drop shadow blended color

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The shadow color must be premultiplied. To avoid
repeating this operation in the fragment shader,
the passed shadow color is already premultiplied.
This commit is contained in:
Mira Grudzinska 2025-04-16 20:12:29 +02:00 • committed by Hermet Park
parent 3b634064c9
commit a2f9b6da21
1 changed files with 6 additions and 3 deletions
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9
src/renderer/wg_engine/tvgWgShaderTypes.cpp
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@ -230,10 +230,13 @@ void WgShaderTypeEffectParams::update(const RenderEffectDropShadow* dropShadow,
params[1] = std::min(WG_GAUSSIAN_KERNEL_SIZE_MAX / kernel, scale);
params[2] = kernel;
params[3] = 0.0f;
params[4] = dropShadow->color[0] / 255.0f; // red
params[5] = dropShadow->color[1] / 255.0f; // green
params[6] = dropShadow->color[2] / 255.0f; // blue
params[7] = dropShadow->color[3] / 255.0f; // alpha
//Color is premultiplied to avoid multiplication in the fragment shader:
params[4] = dropShadow->color[0] / 255.0f * params[7]; // red
params[5] = dropShadow->color[1] / 255.0f * params[7]; // green
params[6] = dropShadow->color[2] / 255.0f * params[7]; // blue
params[8] = offset.x;
params[9] = offset.y;
extend = params[2] * 2; // kernel