SDF icon support (fixes #404)

include/mbgl/map/sprite.hpp

@@ -19,7 +19,7 @@ class FileSource;
 class SpritePosition {
 public:
     explicit SpritePosition() {}
-    explicit SpritePosition(uint16_t x, uint16_t y, uint16_t width, uint16_t height, float pixelRatio = 1.0f);
+    explicit SpritePosition(uint16_t x, uint16_t y, uint16_t width, uint16_t height, float pixelRatio, bool sdf);
 
     operator bool() const {
         return !(width == 0 && height == 0 && x == 0 && y == 0);
@@ -28,6 +28,7 @@ public:
     uint16_t x = 0, y = 0;
     uint16_t width = 0, height = 0;
     float pixelRatio = 1.0f;
+    bool sdf = false;
 };
 
 class Sprite : public std::enable_shared_from_this<Sprite>, private util::noncopyable {

include/mbgl/renderer/painter.hpp

@@ -120,12 +120,24 @@ public:
     void discardFramebuffers();
 
     bool needsAnimation() const;
+
 private:
     void setupShaders();
     mat4 translatedMatrix(const mat4& matrix, const std::array<float, 2> &translation, const Tile::ID &id, TranslateAnchorType anchor);
 
     void prepareTile(const Tile& tile);
 
+    template <typename BucketProperties, typename StyleProperties>
+    void renderSDF(SymbolBucket &bucket,
+                   const Tile::ID &id,
+                   const mat4 &matrixSymbol,
+                   const BucketProperties& bucketProperties,
+                   const StyleProperties& styleProperties,
+                   float scaleDivisor,
+                   std::array<float, 2> texsize,
+                   SDFShader& sdfShader,
+                   void (SymbolBucket::*drawSDF)(SDFShader&));
+
 public:
     void useProgram(uint32_t program);
     void lineWidth(float lineWidth);
@@ -176,7 +188,8 @@ public:
     std::unique_ptr<PatternShader> patternShader;
     std::unique_ptr<IconShader> iconShader;
     std::unique_ptr<RasterShader> rasterShader;
-    std::unique_ptr<SDFShader> sdfShader;
+    std::unique_ptr<SDFGlyphShader> sdfGlyphShader;
+    std::unique_ptr<SDFIconShader> sdfIconShader;
     std::unique_ptr<DotShader> dotShader;
     std::unique_ptr<GaussianShader> gaussianShader;
 

include/mbgl/renderer/symbol_bucket.hpp

@@ -51,7 +51,7 @@ typedef std::vector<Symbol> Symbols;
 
 class SymbolBucket : public Bucket {
     typedef ElementGroup<1> TextElementGroup;
-    typedef ElementGroup<1> IconElementGroup;
+    typedef ElementGroup<2> IconElementGroup;
 
 public:
     SymbolBucket(const StyleBucketSymbol &properties, Collision &collision);
@@ -68,7 +68,8 @@ public:
     void addGlyphs(const PlacedGlyphs &glyphs, float placementZoom, PlacementRange placementRange,
                    float zoom);
 
-    void drawGlyphs(SDFShader &shader);
+    void drawGlyphs(SDFShader& shader);
+    void drawIcons(SDFShader& shader);
     void drawIcons(IconShader& shader);
 
 private:
@@ -90,6 +91,7 @@ private:
 
 public:
     const StyleBucketSymbol &properties;
+    bool sdfIcons = false;
 
 private:
     Collision &collision;

include/mbgl/shader/sdf_shader.hpp

@@ -10,7 +10,7 @@ class SDFShader : public Shader {
 public:
     SDFShader();
 
-    void bind(char *offset);
+    virtual void bind(char *offset) = 0;
 
     UniformMatrix<4>              u_matrix      = {"u_matrix",      *this};
     UniformMatrix<4>              u_exmatrix    = {"u_exmatrix",    *this};
@@ -26,7 +26,7 @@ public:
     Uniform<float>                u_maxfadezoom = {"u_maxfadezoom", *this};
     Uniform<float>                u_fadezoom    = {"u_fadezoom",    *this};
 
-private:
+protected:
     int32_t a_pos = -1;
     int32_t a_offset = -1;
     int32_t a_tex = -1;
@@ -37,6 +37,17 @@ private:
     int32_t a_rangestart = -1;
     int32_t a_labelminzoom = -1;
 };
+
+class SDFGlyphShader : public SDFShader {
+public:
+    void bind(char *offset);
+};
+
+class SDFIconShader : public SDFShader {
+public:
+    void bind(char *offset);
+};
+
 }
 
 #endif