glm::vec3 Transform::position(){
if (!mParent){
return mLocalPosition;
}
if (mDirty.globalPos){
auto pos = globalMatrix() * vec4(0,0,0,1);
mGlobalPosition = vec3(pos);
}
return mGlobalPosition;
}
void BillboardNode::draw(const glm::mat4 & view_matrix, const glm::mat4 & projection_matrix)
{
// inherited draw - draws all children
SceneNode::draw(view_matrix, projection_matrix);
glm::mat4 matrix;
if( m_type == WORLD_ALIGNED )
matrix = projection_matrix * view_matrix * globalMatrix();
else
{
glm::mat4 screen_aligned_matrix = glm::mat4(1.0f); // identity
screen_aligned_matrix[3] = view_matrix[3]; // with translation
matrix = projection_matrix * screen_aligned_matrix * globalMatrix();
}
glUseProgram(m_program);
glUniformMatrix4fv(m_PVMmatrixLoc, 1, GL_FALSE, glm::value_ptr(matrix) );
glUniform2fv(m_texCoordOffsetLoc, 1, glm::value_ptr(m_texture_offset) );
glEnable(GL_BLEND);
glBlendFunc( m_sfactor, m_dfactor );
glBindVertexArray( m_vertexArrayObject );
glUniform1i(m_texSamplerID, 0); // texturing unit 0 -> samplerID [for the GPU linker]
glActiveTexture(GL_TEXTURE0 + 0); // texturing unit 0 -> to be bound [for OpenGL BindTexture]
// =============================== BEGIN OF SOLUTION - TASK 2b ======================================
// based on m_time and m_textureIDs.size();,display all the frames in a loop
unsigned frameNumber = (((int)(m_time*10))%m_textureIDs.size()); // compute the frame here
glBindTexture(GL_TEXTURE_2D, m_textureIDs[frameNumber] );
// =============================== END OF SOLUTION - TASK 2b ======================================
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, m_wrap_s);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, m_wrap_t);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); // just one quad
glBindVertexArray( 0 );
glDisable(GL_BLEND);
}
void SplineSegmentNode::draw(const glm::mat4 & view_matrix, const glm::mat4 & projection_matrix)
{
// inherited draw - draws all children
SceneNode::draw(view_matrix, projection_matrix);
glm::mat4 matrix = projection_matrix * view_matrix * globalMatrix();
glUseProgram(m_program);
glUniformMatrix4fv(m_PVMmatrixLoc, 1, GL_FALSE, glm::value_ptr(matrix) );
glBindVertexArray( m_vertexArrayObject );
// Draw envelope
glUniform4fv( m_colLoc, 1, glm::value_ptr(vec4(1.0, 1.0, 1.0, 1.0) ));
glDrawArrays(GL_LINE_STRIP, 0, curveTestSize );
// draw the spline curve
glLineWidth( 3.0f);
glUniform4fv( m_colLoc, 1, glm::value_ptr(vec4(1.0, 1.0, 0.0, 1.0) ));
glDrawArrays(GL_LINE_STRIP, curveTestSize, m_numberOfCurveSamples );
glLineWidth( 1.0f);
// draw control points
// set OpenGL
glDisable(GL_DEPTH_TEST);
glEnable(GL_POINT_SMOOTH);
glPointSize(5.0f);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glUniform4fv( m_colLoc, 1, glm::value_ptr(vec4(1.0, 0.0, 0.0, 1.0) ));
glDrawArrays(GL_POINTS, 0, 1);
glDrawArrays(GL_POINTS, 1, 1);
glDrawArrays(GL_POINTS, 2, 1);
glDrawArrays(GL_POINTS, 3, 1);
glDisable(GL_POINT_SMOOTH);
// tangents
glUniform4fv( m_colLoc, 1, glm::value_ptr(vec4(0.0, 0.0, 1.0, 1.0) )); // blue
glDrawArrays( GL_LINES, curveTestSize + m_numberOfCurveSamples, 4);
// Draw envelope plananars
glDisable(GL_CULL_FACE );
glUniform4fv( m_colLoc, 1, glm::value_ptr(vec4(0.5, 1.0, 0.5, 0.1) ));
glDrawArrays( GL_TRIANGLES, 0, 3);
glDrawArrays( GL_TRIANGLES, 1, 3);
glEnable(GL_CULL_FACE );
glEnable(GL_DEPTH_TEST);
glBindVertexArray( 0 );
}
void dgCollisionInstance::CalculateBuoyancyAcceleration (const dgMatrix& matrix, const dgVector& origin, const dgVector& gravity, const dgVector& fluidPlane, dgFloat32 fluidDensity, dgFloat32 fluidViscosity, dgVector& unitForce, dgVector& unitTorque)
{
dgMatrix globalMatrix (m_localMatrix * matrix);
unitForce = dgVector (dgFloat32 (0.0f));
unitTorque = dgVector (dgFloat32 (0.0f));
dgVector volumeIntegral (m_childShape->CalculateVolumeIntegral (globalMatrix, fluidPlane, *this));
if (volumeIntegral.m_w > dgFloat32 (0.0f)) {
dgVector buoyanceCenter (volumeIntegral - origin);
dgVector force (gravity.Scale (-fluidDensity * volumeIntegral.m_w));
dgVector torque (buoyanceCenter.CrossProduct(force));
unitForce += force;
unitTorque += torque;
}
}
void Canvas::updateVertexBuffer(std::vector<Sprite*> &sprites) {
vector<vec3> position;
vector<vec2> textureCoords;
vector<vec4> colors;
vector<GLushort> indices;
sort(sprites.begin(), sprites.end(), [](Sprite* s1, Sprite* s2){
return s1->order() < s2->order();
});
unsigned short index = 0;
for (unsigned short i=0;i<sprites.size();i++){
auto sprite = sprites[i];
auto transform = sprite->transform();
vec2 size = (vec2) sprite->textureAtlas()->textureSize();
mat4 toWorld = transform->globalMatrix();
vec2 scale = sprite->scale();
TextureAtlasEntry entry = sprite->entry();
Bounds2 bounds = sprite->trimmedBounds();
vec4 color = sprite->color();
if (sprite->type() == SpriteType::Simple) {
position.push_back((vec3) (toWorld * vec4{bounds.lowLeft(), 0, 1}));
position.push_back((vec3) (toWorld * vec4{bounds.lowRight(), 0, 1}));
position.push_back((vec3) (toWorld * vec4{bounds.upperRight(), 0, 1}));
position.push_back((vec3) (toWorld * vec4{bounds.upperLeft(), 0, 1}));
vec2 min{entry.frame.x / size.x, 1.0 - (entry.frame.y + entry.frame.w) / size.y};
vec2 max{(entry.frame.x + entry.frame.z) / size.x, 1.0 - entry.frame.y / size.y};
textureCoords.push_back(vec2{min.x, min.y});
textureCoords.push_back(vec2{max.x, min.y});
textureCoords.push_back(vec2{max.x, max.y});
textureCoords.push_back(vec2{min.x, max.y});
colors.push_back(color);
colors.push_back(color);
colors.push_back(color);
colors.push_back(color);
// push two triangles
indices.push_back(index);
indices.push_back(index + 1);
indices.push_back(index + 2);
indices.push_back(index + 2);
indices.push_back(index + 3);
indices.push_back(index);
index+=4;
}
else if (sprite->type() == SpriteType::Sliced) {
vec2 dim {entry.frame.z,entry.frame.w};
vec4 sliceX = vec4{bounds.min.x, bounds.min.x + dim.x * sprite->sliceX()[0],bounds.max.x - dim.x * (1.0- sprite->sliceX()[1]), bounds.max.x};
vec4 sliceY = vec4{bounds.min.y, bounds.min.y + dim.y * sprite->sliceY()[0],bounds.max.y - dim.y * (1.0- sprite->sliceY()[1]), bounds.max.y};
vec2 min{entry.frame.x / size.x, 1.0 - (entry.frame.y + entry.frame.w) / size.y};
vec2 max{(entry.frame.x + entry.frame.z) / size.x, 1.0 - entry.frame.y / size.y};
vec4 uvX{min.x, lerp(min.x, max.x, sprite->sliceX()[0]),lerp(min.x, max.x, sprite->sliceX()[1]),max.x};
vec4 uvY{min.y, lerp(min.y, max.y, sprite->sliceY()[0]),lerp(min.y, max.y, sprite->sliceY()[1]),max.y};
for (int x=0;x<3;x++){
for (int y=0;y<3;y++){
position.push_back((vec3) (toWorld * vec4{sliceX[x], sliceY[y], 0, 1}));
position.push_back((vec3) (toWorld * vec4{sliceX[x+1], sliceY[y], 0, 1}));
position.push_back((vec3) (toWorld * vec4{sliceX[x+1], sliceY[y+1], 0, 1}));
position.push_back((vec3) (toWorld * vec4{sliceX[x], sliceY[y+1], 0, 1}));
textureCoords.push_back(vec2{uvX[x], uvY[y]});
textureCoords.push_back(vec2{uvX[x+1], uvY[y]});
textureCoords.push_back(vec2{uvX[x+1], uvY[y+1]});
textureCoords.push_back(vec2{uvX[x], uvY[y+1]});
colors.push_back(color);
colors.push_back(color);
colors.push_back(color);
colors.push_back(color);
// push two triangles
indices.push_back(index);
indices.push_back(index + 1);
indices.push_back(index + 2);
indices.push_back(index + 2);
indices.push_back(index + 3);
indices.push_back(index);
index+=4;
}
}
}
}
mMeshData->setPosition(position);
mMeshData->setColor(colors);
mMeshData->setTexCoord0(textureCoords);
mMeshData->setSubmesh(0,indices, MeshType::Triangles);
mMesh->setMeshData(mMeshData);
}