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gl_engine: fix drop shadow blended color

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The shadow color produced incorrect results after
blending with the texture color. This was caused
by not taking the alpha value into account in the
specified shadow color (with OpenGL blending disabled).
This commit is contained in:
Mira Grudzinska 2025-04-16 19:57:01 +02:00 • committed by Hermet Park
parent fa0a1b7e60
commit 3b634064c9
1 changed files with 4 additions and 3 deletions
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7
src/renderer/gl_engine/tvgGlRenderer.cpp
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@ -979,10 +979,11 @@ void GlRenderer::effectDropShadowUpdate(RenderEffectDropShadow* effect, const Ma
dropShadow->sigma = sigma;
dropShadow->scale = scale;
dropShadow->level = int(GL_GAUSSIAN_MAX_LEVEL * ((effect->quality - 1) * 0.01f)) + 1;
dropShadow->color[0] = effect->color[0] / 255.0f;
dropShadow->color[1] = effect->color[1] / 255.0f;
dropShadow->color[2] = effect->color[2] / 255.0f;
dropShadow->color[3] = effect->color[3] / 255.0f;
//Drop shadow effect applies blending in the shader (GL_BLEND disabled), so the color should be premultiplied:
dropShadow->color[0] = effect->color[0] / 255.0f * dropShadow->color[3];
dropShadow->color[1] = effect->color[1] / 255.0f * dropShadow->color[3];
dropShadow->color[2] = effect->color[2] / 255.0f * dropShadow->color[3];
dropShadow->offset[0] = offset.x;
dropShadow->offset[1] = offset.y;
dropShadow->extend = 2 * std::max(sigma * scale + std::abs(offset.x), sigma * scale + std::abs(offset.y));