1 files changed, 33 insertions, 0 deletions
diff --git a/web/pw-frontend/public/static/shaders/vert/image.glsl b/web/pw-frontend/public/static/shaders/vert/image.glsl
new file mode 100644
index 0000000..5dd3f56
--- /dev/null
+++ b/web/pw-frontend/public/static/shaders/vert/image.glsl
@@ -0,0 +1,33 @@
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+attribute vec2 a_position;
+attribute vec2 a_texCoord;
+
+uniform float u_time;
+
+uniform vec4 u_viewbox;         // [x, y, width, height]
+uniform vec2 u_resolution;
+uniform mat3 u_trans;
+
+varying vec2 v_pos;
+varying vec2 v_texCoord;
+
+void main() {
+    vec3 pos = vec3(a_position, 1.0);
+
+    pos = u_trans * pos;
+
+    vec2 uv = pos.xy;
+
+    // Viewbox's center is top left, a_position's is in the center to the screen
+    // So translate and scale the viewbox**
+    uv -= u_viewbox.xy + (u_viewbox.zw * 0.5);
+    uv /= u_viewbox.zw * 0.5;
+
+    v_pos = (uv.xy + 1.0) * 0.5;
+
+    gl_Position = vec4(uv.xy, 0.0, 1.0);
+    v_texCoord = a_texCoord;
+}