void PointBuffer::render()
{
bindBuffer(GL_ARRAY_BUFFER, m_glBuffer);
if (m_dirty)
{
// upload point data
bufferData(GL_ARRAY_BUFFER, size() * sizeof(Point),
m_pointList.data(), GL_STATIC_DRAW);
m_dirty = false;
}
// enable additive blending
glDisable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, m_cloudTexture);
glTexEnvi(GL_POINT_SPRITE_ARB, GL_COORD_REPLACE_ARB, GL_TRUE);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
float quadratic[] = { 0.0f, 0.0f, 0.01f };
pointParameterFV(GL_POINT_DISTANCE_ATTENUATION_ARB, quadratic);
pointParameterF(GL_POINT_SIZE_MIN_ARB, 0.0);
pointParameterF(GL_POINT_SIZE_MAX_ARB, 64.0);
glEnable(GL_POINT_SPRITE_ARB);
glEnable(GL_POINT_SMOOTH );
glPointSize(64.0);
glVertexPointer(3, GL_FLOAT, sizeof(Point), vertexOffset(0));
glColorPointer(4, GL_FLOAT, sizeof(Point), vertexOffset(sizeof(float) * 3));
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glDrawArrays(GL_POINTS, 0, size());
}
//-----------------------------------------------------------
/// The image from the texture atlas will have potentially
/// been cropped by the tool. This will affect the sprites
/// position within the uncropped image and we need to
/// account for that when positioning the corners
//-----------------------------------------------------------
void SpriteComponent::UpdateVertexPositions()
{
Core::Vector2 frameCenter;
Core::Vector2 frameSize;
if(m_textureAtlas != nullptr && m_hashedTextureAtlasId > 0)
{
CalcFrameCentreAndSize(frameCenter, frameSize);
}
else if(mpMaterial != nullptr && mpMaterial->GetTexture() != nullptr)
{
auto texture = mpMaterial->GetTexture().get();
frameSize = m_sizePolicyDelegate(m_originalSize, Core::Vector2((f32)texture->GetWidth(), (f32)texture->GetHeight()));
}
const Core::Matrix4& worldTransform = GetEntity()->GetTransform().GetWorldTransform();
Core::Vector2 halfFrameSize(frameSize.x * 0.5f, frameSize.y * 0.5f);
Core::Vector2 alignedPosition = -GetAnchorPoint(m_originAlignment, halfFrameSize);
Core::Vector4 vertexCentre(alignedPosition.x + frameCenter.x, alignedPosition.y + frameCenter.y, 0.0f, 1.0f);
//TL
Core::Vector4 vertexOffset(-halfFrameSize.x, halfFrameSize.y, 0.0f, 0.0f);
m_spriteData.sVerts[(u32)SpriteBatch::Verts::k_topLeft].vPos = (vertexCentre + vertexOffset) * worldTransform;
//TR
vertexOffset.x = halfFrameSize.x;
vertexOffset.y = halfFrameSize.y;
m_spriteData.sVerts[(u32)SpriteBatch::Verts::k_topRight].vPos = (vertexCentre + vertexOffset) * worldTransform;
//BL
vertexOffset.x = -halfFrameSize.x;
vertexOffset.y = -halfFrameSize.y;
m_spriteData.sVerts[(u32)SpriteBatch::Verts::k_bottomLeft].vPos = (vertexCentre + vertexOffset) * worldTransform;
//BR
vertexOffset.x = halfFrameSize.x;
vertexOffset.y = -halfFrameSize.y;
m_spriteData.sVerts[(u32)SpriteBatch::Verts::k_bottomRight].vPos = (vertexCentre + vertexOffset) * worldTransform;
}
