render: bar cursor style

shaders/cell.f.glsl

@@ -22,11 +22,12 @@ uniform sampler2D text;
 // Dimensions of the cell
 uniform vec2 cell_size;
 
-// See fragment shader
+// See vertex shader
 const uint MODE_BG = 1u;
 const uint MODE_FG = 2u;
 const uint MODE_CURSOR_RECT = 3u;
 const uint MODE_CURSOR_RECT_HOLLOW = 4u;
+const uint MODE_CURSOR_BAR = 5u;
 
 void main() {
     switch (mode) {
@@ -78,5 +79,9 @@ void main() {
         }
 
         break;
+
+    case MODE_CURSOR_BAR:
+        out_FragColor = color;
+        break;
     }
 }

shaders/cell.v.glsl

@@ -8,6 +8,7 @@ const uint MODE_BG = 1u;
 const uint MODE_FG = 2u;
 const uint MODE_CURSOR_RECT = 3u;
 const uint MODE_CURSOR_RECT_HOLLOW = 4u;
+const uint MODE_CURSOR_BAR = 5u;
 
 // The grid coordinates (x, y) where x < columns and y < rows
 layout (location = 0) in vec2 grid_coord;
@@ -143,6 +144,17 @@ void main() {
         // Same as background since we're taking up the whole cell.
         cell_pos = cell_pos + cell_size * position;
 
+        gl_Position = projection * vec4(cell_pos, 0.0, 1.0);
+        color = bg_color_in / 255.0;
+        break;
+
+    case MODE_CURSOR_BAR:
+        // Make the bar a smaller version of our cell
+        vec2 bar_size = vec2(cell_size.x * 0.2, cell_size.y);
+
+        // Same as background since we're taking up the whole cell.
+        cell_pos = cell_pos + bar_size * position;
+
         gl_Position = projection * vec4(cell_pos, 0.0, 1.0);
         color = bg_color_in / 255.0;
         break;

src/Grid.zig

@@ -45,9 +45,12 @@ cursor_style: CursorStyle,
 /// Default foreground color
 foreground: terminal.color.RGB,
 
+/// Available cursor styles for drawing. The values represents the mode value
+/// in the shader.
 const CursorStyle = enum(u8) {
     box = 3,
     box_hollow = 4,
+    bar = 5,
 };
 
 /// The raw structure that maps directly to the buffer sent to the vertex shader.