Improve tiled NinePatchBackgroundPainter performance (#185)

* Improve tiled NinePatchBackgroundPainter performance

* Use Fabric API's CoreShaderRegistrationCallback

* Switch to LibNinePatch release build

* Rename libgui:tiled -> libgui:tiled_rectangle

* Fix grammar

3 files changed, 67 insertions, 0 deletions

diff --git a/src/main/resources/assets/libgui/shaders/core/tiled_rectangle.fsh b/src/main/resources/assets/libgui/shaders/core/tiled_rectangle.fsh
new file mode 100644
index 0000000..15e3185
--- /dev/null
+++ b/src/main/resources/assets/libgui/shaders/core/tiled_rectangle.fsh
@@ -0,0 +1,32 @@
+#version 150
+
+uniform sampler2D Sampler0;
+uniform vec4 ColorModulator;
+
+uniform vec2 LibGuiRectanglePos;
+uniform vec2 LibGuiTileDimensions;
+uniform vec4 LibGuiTileUvs;
+
+in vec2 vertexPosition;
+out vec4 fragColor;
+
+float lerp(float time, float a, float b) {
+    return (1 - time) * a + time * b;
+}
+
+vec2 getTextureCoords(vec2 pos) {
+    float deltaX = mod(pos.x - LibGuiRectanglePos.x, LibGuiTileDimensions.x) / LibGuiTileDimensions.x;
+    float deltaY = mod(pos.y - LibGuiRectanglePos.y, LibGuiTileDimensions.y) / LibGuiTileDimensions.y;
+    return vec2(
+            lerp(deltaX, LibGuiTileUvs.x, LibGuiTileUvs.z),
+            lerp(deltaY, LibGuiTileUvs.y, LibGuiTileUvs.w)
+    );
+}
+
+void main() {
+    vec4 color = texture(Sampler0, getTextureCoords(vertexPosition));
+    if (color.a < 0.1) {
+        discard;
+    }
+    fragColor = color * ColorModulator;
+}
diff --git a/src/main/resources/assets/libgui/shaders/core/tiled_rectangle.json b/src/main/resources/assets/libgui/shaders/core/tiled_rectangle.json
new file mode 100644
index 0000000..2ca0af3
--- /dev/null
+++ b/src/main/resources/assets/libgui/shaders/core/tiled_rectangle.json
@@ -0,0 +1,20 @@
+{
+	"blend": {
+		"func": "add",
+		"srcrgb": "srcalpha",
+		"dstrgb": "1-srcalpha"
+	},
+	"vertex": "libgui:tiled_rectangle",
+	"fragment": "libgui:tiled_rectangle",
+	"attributes": ["Position"],
+	"samplers": [{ "name": "Sampler0" }],
+	"uniforms": [
+		{ "name": "ModelViewMat", "type": "matrix4x4", "count": 16, "values": [ 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0 ] },
+		{ "name": "ProjMat", "type": "matrix4x4", "count": 16, "values": [ 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0 ] },
+		{ "name": "ColorModulator", "type": "float", "count": 4, "values": [ 1.0, 1.0, 1.0, 1.0 ] },
+		{ "name": "LibGuiRectanglePos", "type": "float", "count": 2, "values": [ 0.0, 0.0 ] },
+		{ "name": "LibGuiTileDimensions", "type": "float", "count": 2, "values": [ 0.0, 0.0 ] },
+		{ "name": "LibGuiTileUvs", "type": "float", "count": 4, "values": [ 0.0, 0.0, 1.0, 1.0 ] },
+		{ "name": "LibGuiPositionMatrix", "type": "matrix4x4", "count": 16, "values": [ 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0 ] }
+	]
+}
diff --git a/src/main/resources/assets/libgui/shaders/core/tiled_rectangle.vsh b/src/main/resources/assets/libgui/shaders/core/tiled_rectangle.vsh
new file mode 100644
index 0000000..6a1209d
--- /dev/null
+++ b/src/main/resources/assets/libgui/shaders/core/tiled_rectangle.vsh
@@ -0,0 +1,15 @@
+#version 150
+
+in vec3 Position;
+
+uniform mat4 ModelViewMat;
+uniform mat4 ProjMat;
+uniform mat4 LibGuiPositionMatrix;
+
+out vec2 vertexPosition;
+
+void main() {
+    gl_Position = ProjMat * ModelViewMat * vec4(Position, 1.0);
+    vec4 rawPos = inverse(LibGuiPositionMatrix) * vec4(Position, 1.0);
+    vertexPosition = rawPos.xy;
+}