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fix: compose camera viewport within parent render area

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This commit is contained in:
ssdfasd
2026-04-01 22:28:07 +08:00
parent 784af81b07
commit 0a0544cbe4
2 changed files with 59 additions and 6 deletions
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17
engine/src/Rendering/SceneRenderer.cpp
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@@ -56,13 +56,18 @@ Math::RectInt ResolveCameraRenderArea(
const Components::CameraComponent& camera,
const RenderSurface& surface) {
const Math::Rect viewportRect = camera.GetViewportRect();
const float surfaceWidth = static_cast<float>(surface.GetWidth());
const float surfaceHeight = static_cast<float>(surface.GetHeight());
const Math::RectInt parentRenderArea = surface.GetRenderArea();
const float parentWidth = static_cast<float>(std::max(parentRenderArea.width, 0));
const float parentHeight = static_cast<float>(std::max(parentRenderArea.height, 0));
const int32_t left = static_cast<int32_t>(std::floor(viewportRect.x * surfaceWidth));
const int32_t top = static_cast<int32_t>(std::floor(viewportRect.y * surfaceHeight));
const int32_t right = static_cast<int32_t>(std::ceil((viewportRect.x + viewportRect.width) * surfaceWidth));
const int32_t bottom = static_cast<int32_t>(std::ceil((viewportRect.y + viewportRect.height) * surfaceHeight));
const int32_t left = parentRenderArea.x +
static_cast<int32_t>(std::floor(viewportRect.x * parentWidth));
const int32_t top = parentRenderArea.y +
static_cast<int32_t>(std::floor(viewportRect.y * parentHeight));
const int32_t right = parentRenderArea.x +
static_cast<int32_t>(std::ceil((viewportRect.x + viewportRect.width) * parentWidth));
const int32_t bottom = parentRenderArea.y +
static_cast<int32_t>(std::ceil((viewportRect.y + viewportRect.height) * parentHeight));
return Math::RectInt(left, top, right - left, bottom - top);
}