From f61e3a82379b3e31021e3ca5fc4b592d07177b85 Mon Sep 17 00:00:00 2001
From: Annika <annika@annikadev.com>
Date: Wed, 8 Jul 2026 14:34:55 -0700
Subject: [PATCH] added gradient shader logic to trapezoids

---
 buffer.cpp               |  23 ++-------------
 example                  | Bin 41128 -> 41128 bytes
 example.cpp              |  20 ++++++-------
 primatives/line.cpp      |   4 +--
 primatives/point.cpp     |   2 +-
 primatives/rectangle.cpp |   9 ++++--
 primatives/trapezoid.cpp |  62 +++++++++++++++++++++++++++++----------
 primatives/triangle.cpp  |   4 +--
 8 files changed, 70 insertions(+), 54 deletions(-)

diff --git a/buffer.cpp b/buffer.cpp
index d80d15e..f3fbac4 100644
--- a/buffer.cpp
+++ b/buffer.cpp
@@ -29,9 +29,9 @@ namespace UwU {
         uint16_t height;
         uint16_t stride;
 
-        void drawPixel(Coord2 coord, Color color) {
+        void drawPixel(uint16_t x, uint16_t y, Color color) {
             // if (color.a == 0) {return;}
-            size_t i = (size_t)coord.y * stride + (size_t)coord.x * 4;
+            size_t i = (size_t)y * stride + (size_t)x * 4;
             // uint8_t b0 = pixels[i + 0];
             // uint8_t g0 = pixels[i + 1];
             // uint8_t r0 = pixels[i + 2];
@@ -41,25 +41,8 @@ namespace UwU {
             pixels[i + 0] = color.b;    // B
             pixels[i + 1] = color.g;    // G
             pixels[i + 2] = color.r;    // R
-            pixels[i + 3] = 0xff; // A
+            pixels[i + 3] = 0xff;       // A
             return;
         }
-
-        // void drawPixelShader(uint16_t x, uint16_t y, Shader& shader) {
-        //     Color newColor = shader.color(x, y);
-        //     if (newColor.a == 0) {return;}
-        //     size_t i = (size_t)y * stride + (size_t)x * 4;
-        //     // uint8_t b0 = pixels[i + 0];
-        //     // uint8_t g0 = pixels[i + 1];
-        //     // uint8_t r0 = pixels[i + 2];
-        //     // uint8_t b = Helpers::lerp8(b0, newColor.b, newColor.a);
-        //     // uint8_t g = Helpers::lerp8(g0, newColor.g, newColor.a);
-        //     // uint8_t r = Helpers::lerp8(r0, newColor.r, newColor.a);
-        //     pixels[i + 0] = newColor.b;    // B
-        //     pixels[i + 1] = newColor.g;    // G
-        //     pixels[i + 2] = newColor.r;    // R
-        //     pixels[i + 3] = 0xff; // A
-        //     return;
-        // }
   };
 }
\ No newline at end of file
diff --git a/example b/example
index 55e4408983dde06040e85f6cedf2fbf334964fd8..2fceecca360ff01011a4ac5e6bf13bcf7264e3ae 100755
GIT binary patch
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diff --git a/example.cpp b/example.cpp
index 54e9d52..89c41c2 100644
--- a/example.cpp
+++ b/example.cpp
@@ -32,9 +32,9 @@ static void onKey(void *user, uint32_t keycode, uint32_t state) {
 
 int main(void) {
   uint16_t w = 800, h = 480;
-  UwU::Shader fuchsia = UwU::Shader(UwU::Direction::H, 69, 420, UwU::Color(0xb00b69ff), UwU::Color(0x00000000));
+  UwU::Shader fuchsia = UwU::Shader(UwU::Direction::H, 360, 600, UwU::Color(0xb00b69ff), UwU::Color(0x00000000));
+  UwU::Shader red = UwU::Shader(UwU::Direction::V, 69, 420, UwU::Color(0xff0000ff), UwU::Color(0x00000000));
   UwU::Shader warmup = UwU::Shader(UwU::Color(0xb00b69ff));
-  UwU::Color red = UwU::Color(0xff000080);
   UwU::Color green = UwU::Color(0x00ff00ff);
   UwU::Color blue = UwU::Color(0x0000ff80);
   // UwU::Color alpha = UwU::Color(0x00000000);
@@ -43,7 +43,11 @@ int main(void) {
   // UwU::Buffer buffer = UwU::Buffer(surface.getWidth(), surface.getHeight());
   
   UwU::Rectangle rectangle = UwU::Rectangle(69, 69, 420, 420);
+  UwU::Trapezoid trapezoid = UwU::Trapezoid(300, 400, 360, 380, 600, 480);
+  UwU::Triangle triangle = UwU::Triangle(280, 100, 240, 290, 320, 300);
+  UwU::Point point = UwU::Point(387, 43);
 
+  rectangle.draw(surface.buffer, red);
 
   // Benchmarking
   struct timespec start, end;
@@ -52,13 +56,13 @@ int main(void) {
   const int SAMPLES = 10;
 
   for (int i = 0; i < WARMUP; i++) {
-    rectangle.draw(surface.buffer, fuchsia);
+    trapezoid.draw(surface.buffer, fuchsia);
   }
   long times[SAMPLES];
   for (int s = 0; s < SAMPLES; s++) {
     clock_gettime(CLOCK_MONOTONIC, &start);
     for (int i = 0; i < BATCH; i++) {
-      rectangle.draw(surface.buffer, fuchsia);
+      trapezoid.draw(surface.buffer, fuchsia);
     }
     clock_gettime(CLOCK_MONOTONIC, &end);
     times[s] = (end.tv_sec - start.tv_sec) * 1000000000L + (end.tv_nsec - start.tv_nsec);
@@ -71,14 +75,10 @@ int main(void) {
   timeAvg /= BATCH;
   printf("Elapsed: %ld ns\n", timeAvg);
   
-  UwU::Trapezoid trapezoid = UwU::Trapezoid(300, 400, 360, 380, 600, 480);
-  trapezoid.draw(surface.buffer, red);
-  UwU::Triangle triangle = UwU::Triangle(280, 100, 240, 290, 320, 300);
   triangle.draw(surface.buffer, blue);
-
-  UwU::Point point = UwU::Point(387, 43);
+  
   point.draw(surface.buffer, green);
-
+  
   UwU::Line lines[8] {
     UwU::Line(300, 100, 250, 469),
     UwU::Line(250, 100, 300, 469),
diff --git a/primatives/line.cpp b/primatives/line.cpp
index 09d1a74..830e9ea 100644
--- a/primatives/line.cpp
+++ b/primatives/line.cpp
@@ -22,7 +22,7 @@ namespace UwU {
         int16_t d = (2 * dy) - dx;
         int16_t y = iy0;
         for (int16_t x = ix0; x < ix1; x++) {
-          buffer.drawPixel(Coord2((uint16_t)x, (uint16_t)y), color);
+          buffer.drawPixel((uint16_t)x, (uint16_t)y, color);
           if (d > 0) {
             y += yi;
             d += (2 * (dy - dx));
@@ -45,7 +45,7 @@ namespace UwU {
         int16_t d = (2 * dx) - dy;
         int16_t x = ix0;
         for (int16_t y = iy0; y < iy1; y++) {
-          buffer.drawPixel(Coord2((uint16_t)x, (uint16_t)y), color);
+          buffer.drawPixel((uint16_t)x, (uint16_t)y, color);
           if (d > 0) {
             x += xi;
             d += (2 * (dx - dy));
diff --git a/primatives/point.cpp b/primatives/point.cpp
index f043228..c82255d 100644
--- a/primatives/point.cpp
+++ b/primatives/point.cpp
@@ -21,7 +21,7 @@ namespace UwU {
       // Draw a rectangle
       void draw (Buffer buffer, Color color) {
         if (x > buffer.width || y > buffer.height) {return;};
-        buffer.drawPixel(Coord2(x, y), color);
+        buffer.drawPixel(x, y, color);
         return;
       }
   };
diff --git a/primatives/rectangle.cpp b/primatives/rectangle.cpp
index f80bab9..b072550 100644
--- a/primatives/rectangle.cpp
+++ b/primatives/rectangle.cpp
@@ -29,20 +29,23 @@ namespace UwU {
           if (x0 > buffer.width || y0 > buffer.height || x1 > buffer.width || y1 > buffer.height) {return;};
           for (uint16_t y = y0; y < y1; y++) {
             for (uint16_t x = x0; x < x1; x++) {
-              buffer.drawPixel(Coord2(x, y), shader.c0);
+              buffer.drawPixel(x, y, shader.c0);
             }
           }
           return;
 
         } else if (shader.shaderType == HGRADIENT) {
           if (x0 > buffer.width || y0 > buffer.height || x1 > buffer.width || y1 > buffer.height) {return;};
+
+          // Precompute gradient LUT
           Color cols[x1 - x0];
           for (uint16_t x = x0; x < x1; x++) {
             cols[x - x0] = ShaderMethods::gradient(shader.u0, shader.scale, shader.c0, shader.c1, x);
           }
+          
           for (uint16_t y = y0; y < y1; y++) {
             for (uint16_t x = x0; x < x1; x++) {
-            buffer.drawPixel(Coord2(x, y), cols[x - x0]);
+            buffer.drawPixel(x, y, cols[x - x0]);
             }
           }
           return;
@@ -52,7 +55,7 @@ namespace UwU {
           for (uint16_t y = y0; y < y1; y++) {
             Color c = ShaderMethods::gradient(shader.v0, shader.scale, shader.c0, shader.c1, y);
             for (uint16_t x = x0; x < x1; x++) {
-              buffer.drawPixel(Coord2(x, y), c);
+              buffer.drawPixel(x, y, c);
             }
           }
           return;
diff --git a/primatives/trapezoid.cpp b/primatives/trapezoid.cpp
index ec58236..9724d45 100644
--- a/primatives/trapezoid.cpp
+++ b/primatives/trapezoid.cpp
@@ -5,6 +5,7 @@
 #include "../datatypes.cpp"
 #include "../helpers.cpp"
 #include "../buffer.cpp"
+#include "../shader.cpp"
 
 namespace UwU {
   // trapezoid (horizontally constrained)
@@ -28,9 +29,7 @@ namespace UwU {
       
       // Draw a horizontally bounded trapezoid
       // y1 >= y0
-      // todo move to private and add public checks
-      void draw (Buffer buffer, Color color) {
-        // printf("(%u, %u, %u, %u, %u, %u)", coords.y0, coords.y1, coords.xl0, coords.xl1, coords.xr0, coords.xr1);
+      void draw (Buffer buffer, Shader shader) {
         uint16_t height = 1 + y1 - y0;
         int16_t LeftBound[height];
         int16_t RightBound[height];
@@ -38,20 +37,51 @@ namespace UwU {
         Helpers::bresenham(0, xl0, y1 - y0, xl1, LeftBound);
         Helpers::bresenham(0, xr0, y1 - y0, xr1, RightBound);
         
-        // printf("leftbound\n");
-        for (uint16_t i = 0; i < height; i++) {
-          // printf("(%u, %u)\n", i, LeftBound[i]);
-        }
-        // printf("rightbound\n");
-        for (uint16_t i = 0; i < height; i++) {
-          // printf("(%u, %u)\n", i, RightBound[i]);
-        }
-        
-        for (uint16_t i = 0; i < height; i++) {
-          for (uint16_t x = LeftBound[i]; x <= RightBound[i]; x++) {
-            // printf("(%u, %u)", x, i + coords.y0);
-            buffer.drawPixel(Coord2(x, i + y0), color);
+        if (shader.shaderType == COLOR) {
+          for (uint16_t i = 0; i < height; i++) {
+            for (uint16_t x = LeftBound[i]; x <= RightBound[i]; x++) {
+              buffer.drawPixel(x, i + y0, shader.c0);
+            }
           }
+          return;
+
+        } else if (shader.shaderType == HGRADIENT) {
+          // find left-right boundaries
+          uint16_t leftmost, rightmost;
+          if (xl0 < xl1) {
+            leftmost = xl0;
+          } else {
+            leftmost = xl1;
+          }
+          if (xr0 > xr1) {
+            rightmost = xr0;
+          } else {
+            rightmost = xr1;
+          }
+
+          // precompute gradient LUT
+          Color cols[rightmost - leftmost];
+          for (uint16_t x = leftmost; x < rightmost; x++) {
+            cols[x - leftmost] = ShaderMethods::gradient(shader.u0, shader.scale, shader.c0, shader.c1, x);
+          }
+
+          for (uint16_t i = 0; i < height; i++) {
+            for (uint16_t x = LeftBound[i]; x <= RightBound[i]; x++) {
+              buffer.drawPixel(x, i + y0, cols[x - leftmost]);
+            }
+          }
+          return;
+
+        } else if (shader.shaderType == VGRADIENT) {
+          Color c;
+          for (uint16_t i = 0; i < height; i++) {
+            c = ShaderMethods::gradient(shader.v0, shader.scale, shader.c0, shader.c1, i + y0);
+            for (uint16_t x = LeftBound[i]; x <= RightBound[i]; x++) {
+              buffer.drawPixel(x, i + y0, c);
+            }
+          }
+          return;
+
         }
         return;
       }
diff --git a/primatives/triangle.cpp b/primatives/triangle.cpp
index 73152ce..e0400f1 100644
--- a/primatives/triangle.cpp
+++ b/primatives/triangle.cpp
@@ -101,7 +101,7 @@ namespace UwU {
           for (uint16_t i = 0; i < height; i++) {
             for (uint16_t x = (uint16_t)splitBound[i]; x <= (uint16_t)longBound[i]; x++) {
               // Helpers::putPixel(buffer, x, i + (uint32_t)top.y, color.r, color.g, color.b, color.a);
-              buffer.drawPixel(Coord2(x, i + (uint16_t)top.y), color);
+              buffer.drawPixel(x, i + (uint16_t)top.y, color);
             }
           }
         } else {
@@ -115,7 +115,7 @@ namespace UwU {
           for (uint16_t i = 0; i < height; i++) {
             for (uint16_t x = (uint16_t)longBound[i]; x <= (uint16_t)splitBound[i]; x++) {
               // Helpers::putPixel(buffer, x, i + (uint32_t)top.y, color.r, color.g, color.b, color.a);
-              buffer.drawPixel(Coord2(x, i + (uint16_t)top.y), color);
+              buffer.drawPixel(x, i + (uint16_t)top.y, color);
             }
           }
         }