added gradient shaders to line

TODO

@@ -2,4 +2,7 @@
 [x] refactor example code using composition
 [x] remove draw class entirely
 [x] create shader classes with polymorphism
-[ ] optimize shader/primative performance (repeat myself!)
+[x] optimize shader/primative performance (repeat myself!)
+[ ] finish implementing gradient shaders to primatives
+[ ] implement buffer shader
+[ ] implement more primatives

primatives/line.cpp

@@ -11,7 +11,7 @@ namespace UwU {
   class Line {
     private:
       // plot lines if m <= 1
-      void lineLow(int16_t ix0, int16_t iy0, int16_t ix1, int16_t iy1, Buffer buffer, Color color) {
+      void lineLow(int16_t ix0, int16_t iy0, int16_t ix1, int16_t iy1, Buffer buffer, Shader shader) {
         int16_t dx = ix1 - ix0;
         int16_t dy = iy1 - iy0;
         int16_t yi = 1;
@@ -21,20 +21,48 @@ namespace UwU {
         }
         int16_t d = (2 * dy) - dx;
         int16_t y = iy0;
-        for (int16_t x = ix0; x < ix1; x++) {
+
-          buffer.drawPixel((uint16_t)x, (uint16_t)y, color);
+        if (shader.shaderType == COLOR) {
-          if (d > 0) {
+          for (int16_t x = ix0; x < ix1; x++) {
-            y += yi;
+            buffer.drawPixel((uint16_t)x, (uint16_t)y, shader.c0);
-            d += (2 * (dy - dx));
+            if (d > 0) {
-          } else {
+              y += yi;
-            d += (2 * dy);
+              d += (2 * (dy - dx));
+            } else {
+              d += (2 * dy);
+            }
           }
+          return;
+
+        } else if (shader.shaderType == HGRADIENT) {
+          for (int16_t x = ix0; x < ix1; x++) {
+            buffer.drawPixel((uint16_t)x, (uint16_t)y, ShaderMethods::gradient(shader.u0, shader.scale, shader.c0, shader.c1, x));
+            if (d > 0) {
+              y += yi;
+              d += (2 * (dy - dx));
+            } else {
+              d += (2 * dy);
+            }
+          }
+          return;
+
+        } else if (shader.shaderType == VGRADIENT) {
+          for (int16_t x = ix0; x < ix1; x++) {
+            buffer.drawPixel((uint16_t)x, (uint16_t)y, ShaderMethods::gradient(shader.v0, shader.scale, shader.c0, shader.c1, y));
+            if (d > 0) {
+              y += yi;
+              d += (2 * (dy - dx));
+            } else {
+              d += (2 * dy);
+            }
+          }
+          return;
         }
         return;
       }
 
       // plot lines if m >1
-      void lineHigh(int16_t ix0, int16_t iy0, int16_t ix1, int16_t iy1, Buffer buffer, Color color) {
+      void lineHigh(int16_t ix0, int16_t iy0, int16_t ix1, int16_t iy1, Buffer buffer, Shader shader) {
         int16_t dx = ix1 - ix0;
         int16_t dy = iy1 - iy0;
         int16_t xi = 1;
@@ -44,8 +72,10 @@ namespace UwU {
         }
         int16_t d = (2 * dx) - dy;
         int16_t x = ix0;
-        for (int16_t y = iy0; y < iy1; y++) {
+
-          buffer.drawPixel((uint16_t)x, (uint16_t)y, color);
+        if (shader.shaderType == COLOR) {
+          for (int16_t y = iy0; y < iy1; y++) {
+          buffer.drawPixel((uint16_t)x, (uint16_t)y, shader.c0);
           if (d > 0) {
             x += xi;
             d += (2 * (dx - dy));
@@ -54,6 +84,33 @@ namespace UwU {
           }
         }
         return;
+
+        } else if (shader.shaderType == HGRADIENT) {
+          for (int16_t y = iy0; y < iy1; y++) {
+          buffer.drawPixel((uint16_t)x, (uint16_t)y, ShaderMethods::gradient(shader.u0, shader.scale, shader.c0, shader.c1, x));
+          if (d > 0) {
+            x += xi;
+            d += (2 * (dx - dy));
+          } else {
+            d += (2 * dx);
+          }
+        }
+        return;
+
+        } else if (shader.shaderType == VGRADIENT) {
+          for (int16_t y = iy0; y < iy1; y++) {
+          buffer.drawPixel((uint16_t)x, (uint16_t)y, ShaderMethods::gradient(shader.v0, shader.scale, shader.c0, shader.c1, y));
+          if (d > 0) {
+            x += xi;
+            d += (2 * (dx - dy));
+          } else {
+            d += (2 * dx);
+          }
+        }
+        return;
+          
+        }
+        return;
       }
 
     public:
@@ -70,7 +127,7 @@ namespace UwU {
       uint16_t y1;
 
       // Uses Bresenham's line algorithm to draw line of any slope
-      void draw (Buffer buffer, Color color) {
+      void draw (Buffer buffer, Shader shader) {
         if (x0 > buffer.width || y0 > buffer.height || x1 > buffer.width || y1 > buffer.height) {return;};
         int16_t ix0 = x0;
         int16_t iy0 = y0;
@@ -78,15 +135,15 @@ namespace UwU {
         int16_t iy1 = y1;
         if (abs(iy1 - iy0) < abs(ix1 - ix0)) {
           if (ix0 > ix1) {
-            lineLow(ix1, iy1, ix0, iy0, buffer, color);
+            lineLow(ix1, iy1, ix0, iy0, buffer, shader);
           } else {
-            lineLow(ix0, iy0, ix1, iy1, buffer, color);
+            lineLow(ix0, iy0, ix1, iy1, buffer, shader);
           }
         } else {
           if (iy0 > iy1) {
-            lineHigh(ix1, iy1, ix0, iy0, buffer, color);
+            lineHigh(ix1, iy1, ix0, iy0, buffer, shader);
           } else {
-            lineHigh(ix0, iy0, ix1, iy1, buffer, color);
+            lineHigh(ix0, iy0, ix1, iy1, buffer, shader);
           }
         }
         return;