Rendering now works! Added shaders for reference.

shader/basic2D.fs

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+#version 130
+precision highp float;
+
+uniform sampler2D tex;
+
+in vec2 tc;
+
+out vec4 color;
+
+void main(){
+	color = texture(tex, tc);
+}

shader/basic2D.vs

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+#version 130
+
+uniform mat3 o, m;
+
+in vec2 vertex;
+in vec2 texCoord;
+
+out vec2 tc;
+
+void main(){
+	tc = texCoord;
+	gl_Position = vec4(o*m*vec3(vertex, 1.0), 1.0);
+}

shader/basic3D.fs

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+#version 130
+precision highp float;
+
+uniform sampler2D tex;
+
+in vec2 tc;
+
+out vec4 color;
+
+void main(){
+	color = texture(tex, tc);
+}

shader/basic3D.vs

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+#version 130
+
+uniform mat4 pv, m;
+
+in vec3 vertex;
+in vec2 texCoord;
+
+out vec2 tc;
+
+void main(){
+	tc = texCoord;
+	gl_Position = pv*m*vec4(vertex, 1.0);
+}

shader/text.fs

@@ -0,0 +1,13 @@
+#version 130
+precision highp float;
+
+uniform sampler2D tex;
+uniform vec4 color;
+
+in vec2 tc;
+
+out vec4 c;
+
+void main(){
+	c = texture(tex, tc)*color;
+}

shader/text.vs

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+#version 130
+
+uniform mat3 o, m;
+
+in vec2 vertex;
+in vec2 texCoord;
+
+out vec2 tc;
+
+void main(){
+	tc = texCoord;
+	gl_Position = vec4(o*m*vec3(vertex, 1.0), 1.0);
+}