vec4 Grove::getPixelData( const ci::vec2 &position, const CameraPersp &cam )
{
// bring window space position to fbo space
vec2 pos = position / vec2( getWindowSize() ) * vec2( mFbo->getSize() );
// sample the fbo to get the pixel data
gl::ScopedFramebuffer scopedReadFbo( mFbo, GL_READ_FRAMEBUFFER );
Area pickingArea( pos, ivec2( pos ) + ivec2( 1 ) );
gl::readBuffer( GL_COLOR_ATTACHMENT1 );
GLubyte pixels[4];
//GLint oldPackAlignment;
//glGetIntegerv( GL_PACK_ALIGNMENT, &oldPackAlignment );
//glPixelStorei( GL_PACK_ALIGNMENT, 1 );
gl::readPixels( pickingArea.getX1(), mFbo->getHeight() - pickingArea.getY2(), pickingArea.getWidth(), pickingArea.getHeight(), GL_RGBA, GL_UNSIGNED_BYTE, &pixels[0] );
//glPixelStorei( GL_PACK_ALIGNMENT, oldPackAlignment );
//float unpackedDepth = glm::dot( vec3( pixels[1], pixels[2], pixels[3] ) / 255.0f, vec3( 1.0, 1.0 / 255.0, 1.0 / 65025.0 ) );
float unpackedDepth = static_cast<float>( pixels[0] ) / 255.0f + ( static_cast<float>( pixels[1] ) / 255.0f * 0.00390625 );
float data = static_cast<float>( pixels[2] );
mat4 viewProj = cam.getProjectionMatrix() * cam.getViewMatrix();
mat4 invViewProj = inverse( viewProj );
vec4 clipSpace;
clipSpace.x = ( (float) pos.x / (float) mFbo->getWidth() ) * 2.0f - 1.0f;
clipSpace.y = ( 1.0f - (float) pos.y / (float) mFbo->getHeight() ) * 2.0f - 1.0f;
clipSpace.z = unpackedDepth * 2.0f - 1.0f;
clipSpace.w = 1.0f;
vec4 worldSpace = invViewProj * clipSpace;
return vec4( vec3( worldSpace ) / worldSpace.w, data );
}
void ShadowMappingBasic::draw()
{
renderDepthFbo();
gl::clear( Color::black() );
gl::setMatrices( mCam );
gl::ScopedTextureBind texScope( mShadowMapTex, (uint8_t) 0 );
vec3 mvLightPos = vec3( gl::getModelView() * vec4( mLightPos, 1.0f ) ) ;
mat4 shadowMatrix = mLightCam.getProjectionMatrix() * mLightCam.getViewMatrix();
mGlsl->uniform( "uShadowMap", 0 );
mGlsl->uniform( "uLightPos", mvLightPos );
mGlsl->uniform( "uShadowMatrix", shadowMatrix );
drawScene( false );
// Uncomment for debug
/*
gl::setMatricesWindow( getWindowSize() );
gl::color( 1.0f, 1.0f, 1.0f );
float size = 0.5f*std::min( getWindowWidth(), getWindowHeight() );
gl::draw( mShadowMapTex, Rectf( 0, 0, size, size ) );
*/
}
// Sets the current view matrix to fit a fullscreen texture exactly in the camera
void TextParticlesApp::lookAtTexture( const CameraPersp &cam, const ci::vec2 &size )
{
auto ctx = gl::context();
ctx->getModelMatrixStack().back() = mat4();
ctx->getProjectionMatrixStack().back() = cam.getProjectionMatrix();
ctx->getViewMatrixStack().back() = cam.getViewMatrix();
ctx->getViewMatrixStack().back() *= glm::scale( vec3( 1, -1, 1 ) ); // invert Y axis so increasing Y goes down.
ctx->getViewMatrixStack().back() *= glm::translate( vec3( size.x / 2, (float) - size.y / 2, 0 ) ); // shift origin up to upper-left corner.
}
void ShadowMappingBasic::draw()
{
renderDepthFbo();
gl::clear( Color::black() );
gl::setMatrices( mCam );
gl::ScopedTextureBind texScope( mShadowMapTex, (uint8_t) 0 );
vec3 mvLightPos = vec3( gl::getModelView() * vec4( mLightPos, 1.0f ) ) ;
mat4 shadowMatrix = mLightCam.getProjectionMatrix() * mLightCam.getViewMatrix();
mGlsl->uniform( "uShadowMap", 0 );
mGlsl->uniform( "uLightPos", mvLightPos );
mGlsl->uniform( "uShadowMatrix", shadowMatrix );
drawScene( false );
}
void ParticleSortingApp::update()
{
mRotation += 0.0015f;
// Create the matrices
mat4 modelMatrix = glm::rotate(mRotation, vec3(1.0f, 1.0f, 1.0f));
modelMatrix = glm::scale(modelMatrix, vec3(mModelScale));
mat4 modelViewMatrix = mCamera.getViewMatrix() * modelMatrix;
mat4 modelViewProjectionMatrix = mCamera.getProjectionMatrix() * modelViewMatrix;
// Set the uniform data
mUniforms.updateData([&]( auto data )
{
data.modelViewProjectionMatrix = toMtl(modelViewProjectionMatrix);
data.modelMatrix = toMtl(modelMatrix);
return data;
});
bitonicSort( false );
}
void CinderProjectionTestApp::draw()
{
// clear out the window with black
gl::clear( Color( 0, 0, 0 ), true );
gl::enableDepthRead();
gl::enableDepthWrite();
//gl::enableAlphaBlending();
if ( mActiveCam == CAM_LOOK )
{
gl::setMatrices( mLookCam );
gl::rotate( mArcball.getQuat() );
}
else if ( mActiveCam == CAM_SWEET )
gl::setMatrices( mSweetCam );
else if ( mActiveCam == CAM_PROJ )
gl::setMatrices( mProjCam );
// Green = Cam from 'sweet spot'
gl::color( Color( 0, 1, 0 ) );
gl::drawFrustum( mSweetCam );
// Cyan = Cam from projector
gl::color( Color( 0, 1, 1 ) );
gl::drawFrustum( mProjCam );
// Draw a grid in the yz plane
gl::color( Color( 0.2f, 0.2f, 0.2f ) );
gl::pushMatrices();
gl::scale(Vec3f::one() /5 );
for (int i=0; i<=20; ++i)
{
gl::drawLine(Vec3f(-100.0f+(i*10.0f), 0.0f, -100.0f),Vec3f(-100.0f+(i*10.0f), 0.0f, 100.0f));
gl::drawLine(Vec3f(-100.0f, 0.0f, -100.0f+(i*10.0f)),Vec3f(100.0f, 0.0f, -100.0f+(i*10.0f)));
}
gl::popMatrices();
gl::color( Color::white() );
//glEnable( GL_LIGHTING );
//glEnable( GL_LIGHT0 );
//GLfloat light_position[] = { mMousePos.x, mMousePos.y, 75.0f, 1.0f };
//glLightfv( GL_LIGHT0, GL_POSITION, light_position );
// Bind texture, so it will be avaible to the fragment shader.
mTexture.bind();
// Bind the texture projection shader, let the magic happen!
mProjShader.bind();
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
mProjShader.uniform("projMap", 0);
mProjShader.uniform("TexGenMat", mSweetCam.getProjectionMatrix() );
mProjShader.uniform("InvViewMat", mProjCam.getInverseModelViewMatrix() );
mProjShader.uniform("texScaling", mTextureScaling );
//mProjShader.uniform("alpha", 0.6f );
//mProjShader.uniform("scaling", 10.0f );
gl::pushModelView();
//gl::rotate( Vec3f( 0.0f, 45.0f, 0.0f ) );
gl::rotate( mCubeRotation );
gl::translate( Vec3f(0.0f, 0.5f * mCubeSize, 0.0f) );
gl::drawColorCube( Vec3f::zero(), Vec3f::one() * mCubeSize );
gl::popModelView();
mProjShader.unbind();
mTexture.unbind();
glDisable( GL_LIGHTING );
gl::color( Color::white() );
// Draw the interface
params::InterfaceGl::draw();
}