Merge remote-tracking branch 'betaboon/graphics' into experimental

1 files changed, 79 insertions, 0 deletions

diff --git a/alacritty/res/graphics.v.glsl b/alacritty/res/graphics.v.glsl
new file mode 100644
index 00000000..56998e9d
--- /dev/null
+++ b/alacritty/res/graphics.v.glsl
@@ -0,0 +1,79 @@
+#version 330 core
+
+// ------
+// INPUTS
+
+// Texture associated to the graphic.
+layout(location = 0) in int textureId;
+
+// Sides where the vertex is located.
+//
+// Bit 0 (LSB) is 0 for top and 1 for bottom.
+// Bit 1 is 0 for left and 1 for right.
+layout(location = 1) in int sides;
+
+// Column number in the grid where the left vertex is set.
+layout(location = 2) in float column;
+
+// Line number in the grid where the left vertex is set.
+layout(location = 3) in float line;
+
+// Height in pixels of the texture.
+layout(location = 4) in float height;
+
+// Width in pixels of the texture.
+layout(location = 5) in float width;
+
+// Offset in the X direction.
+layout(location = 6) in float offsetX;
+
+// Offset in the Y direction.
+layout(location = 7) in float offsetY;
+
+// Height in pixels of a single cell when the graphic was added.
+layout(location = 8) in float baseCellHeight;
+
+// -------
+// OUTPUTS
+
+// Texture sent to the fragment shader.
+flat out int texId;
+
+// Coordinates sent to the fragment shader.
+out vec2 texCoords;
+
+// --------
+// UNIFORMS
+
+// Width and height of a single cell.
+uniform vec2 cellDimensions;
+
+// Width and height of the view.
+uniform vec2 viewDimensions;
+
+
+#define IS_RIGHT_SIDE ((sides & 1) == 1)
+#define IS_BOTTOM_SIDE ((sides & 2) == 2)
+
+void main() {
+    float scale = cellDimensions.y / baseCellHeight;
+    float x = (column * cellDimensions.x - offsetX * scale) / (viewDimensions.x / 2) - 1;
+    float y = -(line * cellDimensions.y - offsetY * scale) / (viewDimensions.y / 2) + 1;
+
+    vec4 position = vec4(x, y, 0, 1);
+    vec2 coords = vec2(0, 0);
+
+    if(IS_RIGHT_SIDE) {
+        position.x += scale * width / (viewDimensions.x / 2);
+        coords.x = 1;
+    }
+
+    if(IS_BOTTOM_SIDE) {
+        position.y += -scale * height / (viewDimensions.y / 2);
+        coords.y = 1;
+    }
+
+    gl_Position = position;
+    texCoords = coords;
+    texId = textureId;
+}