Function AdjustTextureCoordsToViewport

trinity/Tr2Renderer.cpp:267–290

To deal with the adjusted viewport that D3D9 forces us to create when viewport extends beyond the screen

// To deal with the adjusted viewport that D3D9 forces us to create when viewport
// extends beyond the screen
void AdjustTextureCoordsToViewport( Tr2RenderContext& renderContext, Vector2& topLeft, Vector2& bottomRight )
{
	Vector2 tlTexCoordAdjusted = topLeft;

	auto& viewportOnDevice = renderContext.m_esm.GetDeviceViewport();
	auto& viewport = renderContext.m_esm.GetViewport();

	int deltaX = (int)viewportOnDevice.m_x - viewport.x;
	int deltaY = (int)viewportOnDevice.m_y - viewport.y;

	float xOffset = float( deltaX ) / viewport.width;
	float yOffset = float( deltaY ) / viewport.height;

	tlTexCoordAdjusted.x += xOffset * bottomRight.x;
	tlTexCoordAdjusted.y += yOffset * bottomRight.y;

	Vector2 brTexCoordAdjusted;
	brTexCoordAdjusted = bottomRight;
	brTexCoordAdjusted.x *= float( viewportOnDevice.m_width + deltaX ) / viewport.width;
	brTexCoordAdjusted.y *= float( viewportOnDevice.m_height + deltaY ) / viewport.height;

	topLeft = tlTexCoordAdjusted;
	bottomRight = brTexCoordAdjusted;
}


template <typename T>