more shader things that needs multiplatform investigation

src/shaders/gl32spritebatch.frag

@@ -0,0 +1,17 @@
+#version 150
+
+#ifdef GL_ES
+#define LOWP lowp
+precision mediump float;
+#else
+#define LOWP
+#endif
+
+in LOWP vec4 v_color;
+in vec2 v_texCoords;
+uniform sampler2D u_texture;
+out vec4 fragColor;
+
+void main() {
+    fragColor = v_color * texture(u_texture, v_texCoords);
+}