gdk: Move GLSL shaders into GResource

Having the shaders inlined as C strings makes them harder to edit and
maintain.

gdk/resources/glsl/gl2-texture-2d.fs.glsl

@@ -0,0 +1,9 @@
+#version 130
+
+varying vec2 vUv;
+
+uniform sampler2D map;
+
+void main() {
+  gl_FragColor = texture2D (map, vUv);
+}

gdk/resources/glsl/gl2-texture-2d.vs.glsl

@@ -0,0 +1,13 @@
+#version 130
+
+uniform sampler2D map;
+
+attribute vec2 position;
+attribute vec2 uv;
+
+varying vec2 vUv;
+
+void main() {
+  gl_Position = vec4(position, 0, 1);
+  vUv = uv;
+}

gdk/resources/glsl/gl2-texture-rect.fs.glsl

@@ -0,0 +1,9 @@
+#version 130
+
+varying vec2 vUv;
+
+uniform sampler2DRect map;
+
+void main() {
+  gl_FragColor = texture2DRect (map, vUv);
+}

gdk/resources/glsl/gl2-texture-rect.vs.glsl

@@ -0,0 +1,13 @@
+#version 130
+
+uniform sampler2DRect map;
+
+attribute vec2 position;
+attribute vec2 uv;
+
+varying vec2 vUv;
+
+void main() {
+  gl_Position = vec4(position, 0, 1);
+  vUv = uv;
+}

gdk/resources/glsl/gl3-texture-2d.fs.glsl

@@ -0,0 +1,11 @@
+#version 150
+
+in vec2 vUv;
+
+out vec4 vertexColor;
+
+uniform sampler2D map;
+
+void main() {
+  vertexColor = texture2D (map, vUv);
+}

gdk/resources/glsl/gl3-texture-2d.vs.glsl

@@ -0,0 +1,13 @@
+#version 150
+
+uniform sampler2D map;
+
+in vec2 position;
+in vec2 uv;
+
+out vec2 vUv;
+
+void main() {
+  gl_Position = vec4(position, 0, 1);
+  vUv = uv;
+}

gdk/resources/glsl/gl3-texture-rect.fs.glsl

@@ -0,0 +1,9 @@
+#version 150
+
+varying vec2 vUv;
+
+uniform sampler2DRect map;
+
+void main() {
+  gl_FragColor = texture2DRect (map, vUv);
+}

gdk/resources/glsl/gl3-texture-rect.vs.glsl

@@ -0,0 +1,13 @@
+#version 150
+
+uniform sampler2DRect map;
+
+attribute vec2 position;
+attribute vec2 uv;
+
+varying vec2 vUv;
+
+void main() {
+  gl_Position = vec4(position, 0, 1);
+  vUv = uv;
+}