readme

shaders/ImageBox.vert

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+#version 330 core
+layout (location = 0) in vec2 aPos;
+layout (location = 1) in vec2 aTexCoords;
+
+out vec2 TexCoords;
+
+uniform vec2 screenSize;
+uniform vec2 pixelPos;
+uniform vec2 pixelScale;
+
+uniform float z;
+uniform float rotation;
+
+uniform int uvMode = 0;                // 0 = stretch, 1 = tile
+uniform vec3 tileScale = vec3(1.0);
+uniform vec2 uvOffset = vec2(0.0);
+
+void main()
+{
+    vec2 unitPos = aPos * 0.5 + 0.5;
+    vec2 pixelPosTopLeft = pixelPos + unitPos * pixelScale;
+    vec2 ndc = (pixelPosTopLeft / screenSize) * 2.0 - 1.0;
+    ndc.y = -ndc.y;
+
+    gl_Position = vec4(ndc, 0.0f, 1.0f);
+
+    // Screen y runs down here, so flip v to keep images the right way up
+    vec2 uv = vec2(aTexCoords.x, 1.0 - aTexCoords.y);
+    TexCoords = (uvMode == 1 ? uv * tileScale.xy : uv) + uvOffset;
+}