add FontStyle 'bold' and 'italic' properties to 2D text

src/graphics/core/Batch2D.cpp

@@ -261,6 +261,24 @@ void Batch2D::rect(
     vertex(x+w, y+h, u+tx, v, r,g,b,a);
 }
 
+void Batch2D::parallelogram(
+    float x, float y, float w, float h, float skew,
+    float u, float v, float tx, float ty,
+    float r, float g, float b, float a
+){
+    if (index + 6*B2D_VERTEX_SIZE >= capacity) {
+        flush();
+    }
+    setPrimitive(DrawPrimitive::triangle);
+    vertex(x-skew*w, y, u, v+ty, r,g,b,a);
+    vertex(x+(1+skew)*w, y+h, u+tx, v, r,g,b,a);
+    vertex(x+skew*w, y+h, u, v, r,g,b,a);
+
+    vertex(x-skew*w, y, u, v+ty, r,g,b,a);
+    vertex(x+w-skew*w, y, u+tx, v+ty, r,g,b,a);
+    vertex(x+(1+skew)*w, y+h, u+tx, v, r,g,b,a);
+}
+
 void Batch2D::rect(
     float x, float y, float w, float h,
     float r0, float g0, float b0,
@@ -336,6 +354,22 @@ void Batch2D::sprite(float x, float y, float w, float h, int atlasRes, int index
     rect(x, y, w, h, u, v, scale, scale, tint.r, tint.g, tint.b, tint.a);
 }
 
+void Batch2D::sprite(
+    float x,
+    float y,
+    float w,
+    float h,
+    float skew,
+    int atlasRes,
+    int index,
+    glm::vec4 tint
+) {
+    float scale = 1.0f / (float)atlasRes;
+    float u = (index % atlasRes) * scale;
+    float v = 1.0f - ((index / atlasRes) * scale) - scale;
+    parallelogram(x, y, w, h, skew, u, v, scale, scale, tint.r, tint.g, tint.b, tint.a);
+}
+
 void Batch2D::flush() {
     if (index == 0)
         return;

src/graphics/core/Batch2D.hpp

@@ -45,6 +45,7 @@ public:
     void setRegion(UVRegion region);
     void sprite(float x, float y, float w, float h, const UVRegion& region, glm::vec4 tint);
     void sprite(float x, float y, float w, float h, int atlasRes, int index, glm::vec4 tint);
+    void sprite(float x, float y, float w, float h, float skew, int atlasRes, int index, glm::vec4 tint);
     void point(float x, float y, float r, float g, float b, float a);
     
     inline void setColor(glm::vec4 color) {
@@ -79,6 +80,12 @@ public:
         float r, float g, float b, float a
     );
 
+    void parallelogram(
+        float x, float y, float w, float h, float skew,
+        float u, float v, float tx, float ty,
+        float r, float g, float b, float a
+    );
+
     void rect(
         float x, float y, float w, float h,
         float r0, float g0, float b0,

src/graphics/core/Font.cpp

@@ -52,17 +52,21 @@ static inline void draw_glyph(
     uint c, 
     const glm::vec3& right,
     const glm::vec3& up,
-    float glyphInterval
+    float glyphInterval,
+    const FontStyle& style
 ) {
-    batch.sprite(
-        pos.x + offset.x * right.x,
-        pos.y + offset.y * right.y,
-        right.x / glyphInterval,
-        up.y,
-        16,
-        c,
-        batch.getColor()
-    );
+    for (int i = 0; i <= style.bold; i++) {
+        batch.sprite(
+            pos.x + (offset.x + i / (right.x/glyphInterval/2.0f)) * right.x,
+            pos.y + offset.y * right.y,
+            right.x / glyphInterval,
+            up.y,
+            -0.2f * style.italic,
+            16,
+            c,
+            batch.getColor()
+        );
+    }
 }
 
 static inline void draw_glyph(
@@ -72,17 +76,20 @@ static inline void draw_glyph(
     uint c, 
     const glm::vec3& right,
     const glm::vec3& up,
-    float glyphInterval
+    float glyphInterval,
+    const FontStyle& style
 ) {
-    batch.sprite(
-        pos + right * offset.x + up * offset.y,
-        up, right / glyphInterval,
-        0.5f,
-        0.5f,
-        16,
-        c,
-        batch.getColor()
-    );
+    for (int i = 0; i <= style.bold; i++) {
+        batch.sprite(
+            pos + right * (offset.x + i) + up * offset.y,
+            up, right / glyphInterval,
+            0.5f,
+            0.5f,
+            16,
+            c,
+            batch.getColor()
+        );
+    }
 }
 
 template <class Batch>
@@ -99,6 +106,9 @@ static inline void draw_text(
     uint next = MAX_CODEPAGES;
     int x = 0;
     int y = 0;
+
+    FontStyle style {};
+
     do {
         for (uint c : text){
             if (!font.isPrintableChar(c)) {
@@ -109,7 +119,7 @@ static inline void draw_text(
             if (charpage == page){
                 batch.texture(font.getPage(charpage));
                 draw_glyph(
-                    batch, pos, glm::vec2(x, y), c, right, up, glyphInterval
+                    batch, pos, glm::vec2(x, y), c, right, up, glyphInterval, style
                 );
             }
             else if (charpage > page && charpage < next){

src/graphics/core/Font.hpp

@@ -11,10 +11,10 @@ class Batch2D;
 class Batch3D;
 class Camera;
 
-enum class FontStyle {
-    none,
-    shadow,
-    outline
+struct FontStyle {
+    bool bold = false;
+    bool italic = false;
+    glm::vec4 color {1, 1, 1, 1};
 };
 
 class Font {