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#include "path_symbol_shape.hpp"
#include "visual_params.hpp"
#include "../drape/overlay_handle.hpp"
#include "../drape/shader_def.hpp"
#include "../drape/attribute_provider.hpp"
#include "../drape/glstate.hpp"
#include "../drape/batcher.hpp"
#include "../drape/texture_set_holder.hpp"
namespace df
{
using m2::PointF;
using m2::Spline;
using glsl_types::vec2;
using glsl_types::vec4;
int const VertexPerQuad = 4;
class PathSymbolHandle : public dp::OverlayHandle
{
public:
static const uint8_t PositionAttributeID = 1;
PathSymbolHandle(m2::SharedSpline const & spl, PathSymbolViewParams const & params, int maxCount, float hw, float hh)
: OverlayHandle(FeatureID(), dp::Center, 0.0f),
m_params(params), m_spline(spl), m_scaleFactor(1.0f),
m_positions(maxCount * VertexPerQuad), m_maxCount(maxCount),
m_symbolHalfWidth(hw), m_symbolHalfHeight(hh),
m_bbox(1, m2::RectF(0, 0, 0, 0))
{
SetIsVisible(true);
}
virtual void Update(ScreenBase const & screen)
{
m_scaleFactor = screen.GetScale();
Spline::iterator itr = m_spline.CreateIterator();
itr.Step((m_params.m_offset + m_symbolHalfWidth) * m_scaleFactor);
fill(m_positions.begin(), m_positions.end(), vec2(0.0f, 0.0f));
vec2 * it = &m_positions[0];
for (int i = 0; i < m_maxCount; ++i)
{
if (itr.BeginAgain())
break;
PointF const pos = itr.m_pos;
PointF const dir = itr.m_dir * m_symbolHalfWidth * m_scaleFactor;
PointF const norm(-itr.m_dir.y * m_symbolHalfHeight * m_scaleFactor, itr.m_dir.x * m_symbolHalfHeight * m_scaleFactor);
*it = pos - dir + norm; it++;
*it = pos - dir - norm; it++;
*it = pos + dir + norm; it++;
*it = pos + dir - norm; it++;
itr.Step(m_params.m_step * m_scaleFactor);
}
}
vector<m2::RectF> & GetPixelShape(ScreenBase const & screen)
{
return m_bbox;
}
virtual m2::RectD GetPixelRect(ScreenBase const & screen) const
{
return m2::RectD(0, 0, 0, 0);
}
virtual void GetAttributeMutation(dp::RefPointer<dp::AttributeBufferMutator> mutator, ScreenBase const & screen) const
{
TOffsetNode const & node = GetOffsetNode(PositionAttributeID);
dp::MutateNode mutateNode;
mutateNode.m_region = node.second;
mutateNode.m_data = dp::MakeStackRefPointer<void>(&m_positions[0]);
mutator->AddMutation(node.first, mutateNode);
}
private:
PathSymbolViewParams m_params;
m2::SharedSpline m_spline;
float m_scaleFactor;
mutable vector<vec2> m_positions;
int const m_maxCount;
float m_symbolHalfWidth;
float m_symbolHalfHeight;
vector<m2::RectF> m_bbox;
};
PathSymbolShape::PathSymbolShape(m2::SharedSpline const & spline,
PathSymbolViewParams const & params,
float nextScaleGtoP)
: m_params(params)
, m_spline(spline)
, m_nextScaleGtoP(nextScaleGtoP)
{
}
void PathSymbolShape::Draw(dp::RefPointer<dp::Batcher> batcher, dp::RefPointer<dp::TextureSetHolder> textures) const
{
int maxCount = (m_spline->GetLength() * m_nextScaleGtoP - m_params.m_offset) / m_params.m_step + 1;
if (maxCount <= 0)
return;
int const vertCnt = maxCount * VertexPerQuad;
vector<vec2> positions(vertCnt, vec2(0.0f, 0.0f));
vector<vec4> uvs(vertCnt);
vec4 * tc = &uvs[0];
dp::TextureSetHolder::SymbolRegion region;
textures->GetSymbolRegion(m_params.m_symbolName, region);
m2::RectF const & rect = region.GetTexRect();
float textureNum = (float)region.GetTextureNode().m_textureOffset;
m2::PointU pixelSize;
region.GetPixelSize(pixelSize);
for(int i = 0; i < maxCount; ++i)
{
*tc = vec4(rect.minX(), rect.maxY(), textureNum, m_params.m_depth);
tc++;
*tc = vec4(rect.minX(), rect.minY(), textureNum, m_params.m_depth);
tc++;
*tc = vec4(rect.maxX(), rect.maxY(), textureNum, m_params.m_depth);
tc++;
*tc = vec4(rect.maxX(), rect.minY(), textureNum, m_params.m_depth);
tc++;
}
dp::GLState state(gpu::TEXTURING_PROGRAM, dp::GLState::DynamicGeometry);
state.SetTextureSet(region.GetTextureNode().m_textureSet);
state.SetBlending(dp::Blending(true));
dp::AttributeProvider provider(3, vertCnt);
{
dp::BindingInfo position(1, PathSymbolHandle::PositionAttributeID);
dp::BindingDecl & decl = position.GetBindingDecl(0);
decl.m_attributeName = "a_position";
decl.m_componentCount = 2;
decl.m_componentType = gl_const::GLFloatType;
decl.m_offset = 0;
decl.m_stride = 0;
provider.InitStream(0, position, dp::MakeStackRefPointer(&positions[0]));
}
{
dp::BindingInfo normal(1);
dp::BindingDecl & decl = normal.GetBindingDecl(0);
decl.m_attributeName = "a_normal";
decl.m_componentCount = 2;
decl.m_componentType = gl_const::GLFloatType;
decl.m_offset = 0;
decl.m_stride = 0;
provider.InitStream(1, normal, dp::MakeStackRefPointer(&positions[0]));
}
{
dp::BindingInfo texcoord(1);
dp::BindingDecl & decl = texcoord.GetBindingDecl(0);
decl.m_attributeName = "a_texCoords";
decl.m_componentCount = 4;
decl.m_componentType = gl_const::GLFloatType;
decl.m_offset = 0;
decl.m_stride = 0;
provider.InitStream(2, texcoord, dp::MakeStackRefPointer(&uvs[0]));
}
dp::OverlayHandle * handle = new PathSymbolHandle(m_spline, m_params, maxCount, pixelSize.x / 2.0f, pixelSize.y / 2.0f);
batcher->InsertListOfStrip(state, dp::MakeStackRefPointer(&provider), dp::MovePointer(handle), VertexPerQuad);
}
}
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