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optimize draw

This commit is contained in:
yangxiao 2015-06-25 15:14:44 +08:00
parent 13dbd44250
commit f4a81f0e53
1 changed files with 1 additions and 15 deletions
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16
cocos/3d/CCSkybox.cpp
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@ -155,24 +155,10 @@ void Skybox::onDraw(const Mat4& transform, uint32_t flags)
{
auto camera = Camera::getVisitingCamera();
/*
At beginning, we have a regular skybox at origin point.
To render the skybox, we should keep camera at the center of skybox.
So we need a translate matrix, which can transform origin point to camera pos.
Camera's node to word transform matrix don't match our requement,
because it maybe contain the scale, rotate, reflact... effects, which isn't need.
First, we transform origin point to camera position by camera's node to world matrix.
Second, we create a translate matrix with the origin point's world position.
*/
Vec3 cameraPosInNode(0, 0, 0);
Vec3 cameraPosInWorld;
Mat4 cameraModelMat = camera->getNodeToWorldTransform();
Mat4 trans = Mat4::IDENTITY;
cameraModelMat.transformPoint(cameraPosInNode, &cameraPosInWorld);
trans.translate(cameraPosInWorld);
auto state = getGLProgramState();
state->apply(trans);
state->apply(transform);
Vec4 color(_displayedColor.r / 255.f, _displayedColor.g / 255.f, _displayedColor.b / 255.f, 1.f);
state->setUniformVec4("u_color", color);