Use a single default shader for all meshes.

* data/shaders/default-fragment.glsl: New file.
* data/shaders/default-vertex.glsl: New file.
* data/shaders/font-fragment.glsl: Delete.
* data/shaders/font-vertex.glsl: Delete.
* data/shaders/sprite-fragment.glsl: Delete.
* data/shaders/sprite-vertex.glsl: Delete.
* examples/common.scm: Remove call to enable-sprites.
* sly/font.scm (font-shader): Delete.
  (enable-fonts): Remove shader loading.
  (make-label): Use default shader.
* sly/shape.scm (make-cube): Make texture and shader optional keyword
  arguments.
* sly/sprite.scm (sprite-shader, enable-sprites): Delete.
  (make-sprite): Make shader an optional keyword argument.

1 files changed, 8 insertions, 0 deletions

diff --git a/data/shaders/default-fragment.glsl b/data/shaders/default-fragment.glsl
new file mode 100644
index 0000000..e90adbe
--- /dev/null
+++ b/data/shaders/default-fragment.glsl
@@ -0,0 +1,8 @@
+#version 130
+
+in vec2 frag_tex;
+uniform sampler2D color_texture;
+
+void main (void) {
+    gl_FragColor = texture2D(color_texture, frag_tex);
+}