C++ RenderTexture::setView方法代码示例

void GuiElement::adjustRenderTexture(sf::RenderTexture& texture)
{
    P<WindowManager> window_manager = engine->getObject("windowManager");
    //Hack the rectangle for this element so it sits perfectly on pixel boundaries.
    sf::Vector2f half_pixel = (window_manager->mapPixelToCoords(sf::Vector2i(1, 1)) - window_manager->mapPixelToCoords(sf::Vector2i(0, 0))) / 2.0f;
    sf::Vector2f top_left = window_manager->mapPixelToCoords(window_manager->mapCoordsToPixel(sf::Vector2f(rect.left, rect.top) + half_pixel));
    sf::Vector2f bottom_right = window_manager->mapPixelToCoords(window_manager->mapCoordsToPixel(sf::Vector2f(rect.left + rect.width, rect.top + rect.height) + half_pixel));
    rect.left = top_left.x;
    rect.top = top_left.y;
    rect.width = bottom_right.x - top_left.x;
    rect.height = bottom_right.y - top_left.y;

    sf::Vector2i texture_size = window_manager->mapCoordsToPixel(sf::Vector2f(rect.width, rect.height) + half_pixel) - window_manager->mapCoordsToPixel(sf::Vector2f(0, 0));
    unsigned int sx = powerOfTwo(texture_size.x);
    unsigned int sy = powerOfTwo(texture_size.y);
    if (texture.getSize().x != sx && texture.getSize().y != sy)
    {
        texture.create(sx, sy, false);
    }
    //Set the view so it covers this elements normal rect. So we can draw exactly the same on this texture as no the normal screen.
    sf::View view(rect);
    view.setViewport(sf::FloatRect(0, 0, float(texture_size.x) / float(sx), float(texture_size.y) / float(sy)));
    texture.setView(view);
}

		void setView          (const sf::View & view)
		{
			texture.setView(view);
		}

void LightDirectionEmission::render(const sf::View &view, sf::RenderTexture &lightTempTexture, sf::RenderTexture &antumbraTempTexture, const std::vector<QuadtreeOccupant*> &shapes, sf::Shader &unshadowShader, float shadowExtension) {
	lightTempTexture.setView(view);

	LightSystem::clear(lightTempTexture, sf::Color::White);

	// Mask off light shape (over-masking - mask too much, reveal penumbra/antumbra afterwards)
	for (int i = 0; i < shapes.size(); i++) {
		LightShape* pLightShape = static_cast<LightShape*>(shapes[i]);

		// Get boundaries
		std::vector<LightSystem::Penumbra> penumbras;
		std::vector<int> innerBoundaryIndices;
		std::vector<int> outerBoundaryIndices;
		std::vector<sf::Vector2f> innerBoundaryVectors;
		std::vector<sf::Vector2f> outerBoundaryVectors;

		LightSystem::getPenumbrasDirection(penumbras, innerBoundaryIndices, innerBoundaryVectors, outerBoundaryIndices, outerBoundaryVectors, pLightShape->_shape, _castDirection, _sourceRadius, _sourceDistance);

		if (innerBoundaryIndices.size() != 2 || outerBoundaryIndices.size() != 2)
			continue;

		LightSystem::clear(antumbraTempTexture, sf::Color::White);

		antumbraTempTexture.setView(view);

		sf::ConvexShape maskShape;

		float maxDist = 0.0f;

		for (int j = 0; j < pLightShape->_shape.getPointCount(); j++)
			maxDist = std::max(maxDist, vectorMagnitude(view.getCenter() - pLightShape->_shape.getTransform().transformPoint(pLightShape->_shape.getPoint(j))));

		float totalShadowExtension = shadowExtension + maxDist;

		maskShape.setPointCount(4);

		maskShape.setPoint(0, pLightShape->_shape.getTransform().transformPoint(pLightShape->_shape.getPoint(innerBoundaryIndices[0])));
		maskShape.setPoint(1, pLightShape->_shape.getTransform().transformPoint(pLightShape->_shape.getPoint(innerBoundaryIndices[1])));
		maskShape.setPoint(2, pLightShape->_shape.getTransform().transformPoint(pLightShape->_shape.getPoint(innerBoundaryIndices[1])) + vectorNormalize(innerBoundaryVectors[1]) * totalShadowExtension);
		maskShape.setPoint(3, pLightShape->_shape.getTransform().transformPoint(pLightShape->_shape.getPoint(innerBoundaryIndices[0])) + vectorNormalize(innerBoundaryVectors[0]) * totalShadowExtension);

		maskShape.setFillColor(sf::Color::Black);

		antumbraTempTexture.draw(maskShape);

		sf::VertexArray vertexArray;

		vertexArray.setPrimitiveType(sf::PrimitiveType::Triangles);

		vertexArray.resize(3);

		{
			sf::RenderStates states;
			states.blendMode = sf::BlendAdd;
			states.shader = &unshadowShader;

			// Unmask with penumbras
			for (int j = 0; j < penumbras.size(); j++) {
				unshadowShader.setParameter("lightBrightness", penumbras[j]._lightBrightness);
				unshadowShader.setParameter("darkBrightness", penumbras[j]._darkBrightness);

				vertexArray[0].position = penumbras[j]._source;
				vertexArray[1].position = penumbras[j]._source + vectorNormalize(penumbras[j]._lightEdge) * totalShadowExtension;
				vertexArray[2].position = penumbras[j]._source + vectorNormalize(penumbras[j]._darkEdge) * totalShadowExtension;

				vertexArray[0].texCoords = sf::Vector2f(0.0f, 1.0f);
				vertexArray[1].texCoords = sf::Vector2f(1.0f, 0.0f);
				vertexArray[2].texCoords = sf::Vector2f(0.0f, 0.0f);

				antumbraTempTexture.draw(vertexArray, states);
			}
		}

		antumbraTempTexture.display();

		// Multiply back to lightTempTexture
		sf::RenderStates antumbraRenderStates;
		antumbraRenderStates.blendMode = sf::BlendMultiply;

		sf::Sprite s;

		s.setTexture(antumbraTempTexture.getTexture());

		lightTempTexture.setView(lightTempTexture.getDefaultView());

		lightTempTexture.draw(s, antumbraRenderStates);

		lightTempTexture.setView(view);
	}

	for (int i = 0; i < shapes.size(); i++) {
		LightShape* pLightShape = static_cast<LightShape*>(shapes[i]);

		if (pLightShape->_renderLightOverShape) {
			pLightShape->_shape.setFillColor(sf::Color::White);

			lightTempTexture.draw(pLightShape->_shape);
		}
	}

//.........这里部分代码省略.........

void LightPointEmission::render(const sf::View &view, sf::RenderTexture &lightTempTexture, sf::RenderTexture &emissionTempTexture, sf::RenderTexture &antumbraTempTexture, const std::vector<QuadtreeOccupant*> &shapes, sf::Shader &unshadowShader, sf::Shader &lightOverShapeShader) {
	LightSystem::clear(emissionTempTexture, sf::Color::Black);

	emissionTempTexture.setView(view);

	emissionTempTexture.draw(_emissionSprite);

	emissionTempTexture.display();
	
	LightSystem::clear(lightTempTexture, sf::Color::Black);

	lightTempTexture.setView(view);

	lightTempTexture.draw(_emissionSprite);

	sf::Transform t;
	t.translate(_emissionSprite.getPosition());
	t.rotate(_emissionSprite.getRotation());
	t.scale(_emissionSprite.getScale());

	sf::Vector2f castCenter = t.transformPoint(_localCastCenter);

	float shadowExtension = _shadowOverExtendMultiplier * (getAABB().width + getAABB().height);

	struct OuterEdges {
		std::vector<int> _outerBoundaryIndices;
		std::vector<sf::Vector2f> _outerBoundaryVectors;
	};

	std::vector<OuterEdges> outerEdges(shapes.size());

	// Mask off light shape (over-masking - mask too much, reveal penumbra/antumbra afterwards)
	for (unsigned i = 0; i < shapes.size(); i++) {
		LightShape* pLightShape = static_cast<LightShape*>(shapes[i]);

		// Get boundaries
		std::vector<int> innerBoundaryIndices;
		std::vector<sf::Vector2f> innerBoundaryVectors;
		std::vector<LightSystem::Penumbra> penumbras;

		LightSystem::getPenumbrasPoint(penumbras, innerBoundaryIndices, innerBoundaryVectors, outerEdges[i]._outerBoundaryIndices, outerEdges[i]._outerBoundaryVectors, pLightShape->_shape, castCenter, _sourceRadius);

		if (innerBoundaryIndices.size() != 2 || outerEdges[i]._outerBoundaryIndices.size() != 2)
			continue;

		// Render shape
		if (!pLightShape->_renderLightOverShape) {
			pLightShape->_shape.setFillColor(sf::Color::Black);

			lightTempTexture.draw(pLightShape->_shape);
		}

		sf::RenderStates maskRenderStates;
		maskRenderStates.blendMode = sf::BlendNone;

		sf::Vector2f as = pLightShape->_shape.getTransform().transformPoint(pLightShape->_shape.getPoint(outerEdges[i]._outerBoundaryIndices[0]));
		sf::Vector2f bs = pLightShape->_shape.getTransform().transformPoint(pLightShape->_shape.getPoint(outerEdges[i]._outerBoundaryIndices[1]));
		sf::Vector2f ad = outerEdges[i]._outerBoundaryVectors[0];
		sf::Vector2f bd = outerEdges[i]._outerBoundaryVectors[1];

		sf::Vector2f intersectionOuter;

		// Handle antumbras as a seperate case
		if (rayIntersect(as, ad, bs, bd, intersectionOuter)) {
			sf::Vector2f asi = pLightShape->_shape.getTransform().transformPoint(pLightShape->_shape.getPoint(innerBoundaryIndices[0]));
			sf::Vector2f bsi = pLightShape->_shape.getTransform().transformPoint(pLightShape->_shape.getPoint(innerBoundaryIndices[1]));
			sf::Vector2f adi = innerBoundaryVectors[0];
			sf::Vector2f bdi = innerBoundaryVectors[1];

			LightSystem::clear(antumbraTempTexture, sf::Color::White);

			antumbraTempTexture.setView(view);

			sf::Vector2f intersectionInner;

			if (rayIntersect(asi, adi, bsi, bdi, intersectionInner)) {
				sf::ConvexShape maskShape;

				maskShape.setPointCount(3);

				maskShape.setPoint(0, asi);
				maskShape.setPoint(1, bsi);
				maskShape.setPoint(2, intersectionInner);

				maskShape.setFillColor(sf::Color::Black);

				antumbraTempTexture.draw(maskShape);	
			}
			else {
				sf::ConvexShape maskShape;

				maskShape.setPointCount(4);

				maskShape.setPoint(0, asi);
				maskShape.setPoint(1, bsi);
				maskShape.setPoint(2, bsi + vectorNormalize(bdi) * shadowExtension);
				maskShape.setPoint(3, asi + vectorNormalize(adi) * shadowExtension);

				maskShape.setFillColor(sf::Color::Black);

//.........这里部分代码省略.........