void AmbientOcclusionManager::setTextureSize(AOTextureSize textureSize)
{
this->textureSize = textureSize;
createOrUpdateAOTexture();
createOrUpdateAOShader();
}
void AmbientOcclusionManager::setNumSteps(unsigned int numSteps)
{
this->numSteps = numSteps;
createOrUpdateAOTexture();
createOrUpdateAOShader();
}
void AmbientOcclusionManager::setDistanceAttenuation(float depthStartAttenuation, float depthEndAttenuation)
{
this->depthStartAttenuation = depthStartAttenuation;
this->depthEndAttenuation = depthEndAttenuation;
createOrUpdateAOShader();
}
void AmbientOcclusionManager::setKernelSamples(unsigned int kernelSamples)
{
this->kernelSamples = kernelSamples;
createOrUpdateAOTexture();
createOrUpdateAOShader();
}
void AmbientOcclusionManager::onCameraProjectionUpdate(const Camera *const camera)
{
nearPlane = camera->getNearPlane();
farPlane = camera->getFarPlane();
projectionScale = camera->getProjectionMatrix()(1, 1);
createOrUpdateAOTexture();
createOrUpdateAOShader();
}
void AmbientOcclusionManager::onResize(unsigned int width, unsigned int height)
{
sceneWidth = width;
sceneHeight = height;
createOrUpdateAOTexture();
createOrUpdateAOShader();
ShaderManager::instance()->bind(hbaoShader);
Vector2<float> invResolution(1.0f/sceneWidth, 1.0f/sceneHeight);
glUniform2fv(invResolutionLoc, 1, invResolution);
}
AmbientOcclusionManager::AmbientOcclusionManager(unsigned int depthTexID, unsigned int normalAndAmbientTexID) :
sceneWidth(0),
sceneHeight(0),
nearPlane(0.0f),
farPlane(0.0f),
projectionScale(0.0f),
textureSize(DEFAULT_TEXTURE_SIZE),
textureSizeX(0),
textureSizeY(0),
kernelSamples(DEFAULT_KERNEL_SAMPLES),
radius(DEFAULT_RADIUS),
ambientOcclusionStrength(DEFAULT_AO_STRENGTH),
depthStartAttenuation(DEFAULT_DEPTH_START_ATTENUATION),
depthEndAttenuation(DEFAULT_DEPTH_END_ATTENUATION),
noiseTextureSize(DEFAULT_NOISE_TEXTURE_SIZE),
bias(DEFAULT_BIAS),
blurSize(DEFAULT_BLUR_SIZE),
blurSharpness(DEFAULT_BLUR_SHARPNESS),
fboID(0),
ambientOcclusionTexID(0),
ambientOcclusionShader(0),
mInverseViewProjectionLoc(0),
mProjectionLoc(0),
mViewLoc(0),
resolutionLoc(0),
noiseTexId(0),
depthTexID(depthTexID),
normalAndAmbientTexID(normalAndAmbientTexID),
ambientOcclusionTexLoc(0),
verticalBlurFilter(nullptr),
horizontalBlurFilter(nullptr),
isBlurActivated(true)
{
glBindTexture(GL_TEXTURE_2D, depthTexID);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glBindTexture(GL_TEXTURE_2D, normalAndAmbientTexID);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
quadDisplayer = std::make_unique<QuadDisplayerBuilder>()->build();
//frame buffer object
glGenFramebuffers(1, &fboID);
createOrUpdateAOTexture();
createOrUpdateAOShader();
}
void AmbientOcclusionManager::onResize(unsigned int width, unsigned int height)
{
sceneWidth = width;
sceneHeight = height;
createOrUpdateAOTexture();
createOrUpdateAOShader();
ShaderManager::instance()->bind(ambientOcclusionShader);
Vector2<float> resolution(sceneWidth, sceneHeight);
glUniform2fv(resolutionLoc, 1, (const float *)resolution);
}
AmbientOcclusionManager::AmbientOcclusionManager(unsigned int depthTexID, unsigned int normalAndAmbientTexID) :
sceneWidth(0),
sceneHeight(0),
nearPlane(0.0f),
farPlane(0.0f),
projectionScale(0.0f),
textureSize((AOTextureSize)DEFAULT_TEXTURE_SIZE),
textureSizeX(0),
textureSizeY(0),
numDirections(DEFAULT_NUM_DIRECTIONS),
numSteps(DEFAULT_NUM_STEPS),
radius(DEFAULT_RADIUS),
ambientOcclusionExponent(DEFAULT_AO_EXPONENT),
biasAngleInDegree(DEFAULT_BIAS_ANGLE_IN_DEGREE),
blurSize(DEFAULT_BLUR_SIZE),
blurSharpness(DEFAULT_BLUR_SHARPNESS),
randomTextureSize(RANDOM_TEXTURE_SIZE),
fboID(0),
ambientOcclusionTexID(0),
hbaoShader(0),
mInverseViewProjectionLoc(0),
cameraPlanesLoc(0),
invResolutionLoc(0),
nearPlaneScreenRadiusLoc(0),
randomTexID(0),
depthTexID(depthTexID),
normalAndAmbientTexID(normalAndAmbientTexID),
ambienOcclusionTexLoc(0),
verticalBlurFilter(nullptr),
horizontalBlurFilter(nullptr),
isBlurActivated(true)
{
glBindTexture(GL_TEXTURE_2D, depthTexID);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glBindTexture(GL_TEXTURE_2D, normalAndAmbientTexID);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
quadDisplayer = std::make_unique<QuadDisplayerBuilder>()->build();
//frame buffer object
glGenFramebuffers(1, &fboID);
createOrUpdateAOTexture();
createOrUpdateAOShader();
}
/**
* @param biasAngle Bias angle in degree. If angle between two faces is > (180 degree - 2*bias angle): faces will not produce occlusion on each other.
* A value of 0 degree will produce maximum of occlusion. A value of 90 degrees won't produce occlusion.
* This bias angle allows to eliminate some unexpected artifacts especially when camera is near to a surface.
*/
void AmbientOcclusionManager::setBiasAngleInDegree(float biasAngleInDegree)
{
this->biasAngleInDegree = biasAngleInDegree;
createOrUpdateAOShader();
}
void AmbientOcclusionManager::setAmbientOcclusionExponent(float ambientOcclusionExponent)
{
this->ambientOcclusionExponent = ambientOcclusionExponent;
createOrUpdateAOShader();
}
/**
* @param radius Scope radius in units.
* Example: if 1.0f represents one meter, a radius of 0.5f will represent of radius of 50 centimeters.
*/
void AmbientOcclusionManager::setRadius(float radius)
{
this->radius = radius;
createOrUpdateAOShader();
}
void AmbientOcclusionManager::setBias(float bias)
{
this->bias = bias;
createOrUpdateAOShader();
}
void AmbientOcclusionManager::setNoiseTextureSize(unsigned int noiseTextureSize)
{
this->noiseTextureSize = noiseTextureSize;
createOrUpdateAOShader();
}
void AmbientOcclusionManager::setAmbientOcclusionStrength(float ambientOcclusionStrength)
{
this->ambientOcclusionStrength = ambientOcclusionStrength;
createOrUpdateAOShader();
}
