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.

6 files changed, 19 insertions, 57 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);
+}
diff --git a/data/shaders/default-vertex.glsl b/data/shaders/default-vertex.glsl
new file mode 100644
index 0000000..11f389f
--- /dev/null
+++ b/data/shaders/default-vertex.glsl
@@ -0,0 +1,11 @@
+#version 130
+
+in vec3 position;
+in vec2 tex;
+out vec2 frag_tex;
+uniform mat4 mvp;
+
+void main(void) {
+    frag_tex = tex;
+    gl_Position = mvp * vec4(position.xyz, 1.0);
+}
diff --git a/data/shaders/font-fragment.glsl b/data/shaders/font-fragment.glsl
deleted file mode 100644
index 3dd10f1..0000000
--- a/data/shaders/font-fragment.glsl
+++ /dev/null
@@ -1,8 +0,0 @@
-#version 120
-
-uniform sampler2D color_texture;
-uniform vec4 color;
-
-void main (void) {
-    gl_FragColor = texture2D(color_texture, gl_TexCoord[0].st) * color;
-}
diff --git a/data/shaders/font-vertex.glsl b/data/shaders/font-vertex.glsl
deleted file mode 100644
index 196da12..0000000
--- a/data/shaders/font-vertex.glsl
+++ /dev/null
@@ -1,15 +0,0 @@
-#version 120
-
-uniform mat4 projection;
-uniform vec2 position;
-uniform vec2 anchor;
-
-void main(void) {
-    mat4 translation = mat4(1.0, 0.0, 0.0, position.x - anchor.x,
-                            0.0, 1.0, 0.0, position.y - anchor.y,
-                            0.0, 0.0, 1.0, 0.0,
-                            0.0, 0.0, 0.0, 1.0);
-
-    gl_Position = projection * (gl_Vertex * translation);
-    gl_TexCoord[0] = gl_MultiTexCoord0;
-}
diff --git a/data/shaders/sprite-fragment.glsl b/data/shaders/sprite-fragment.glsl
deleted file mode 100644
index 3dd10f1..0000000
--- a/data/shaders/sprite-fragment.glsl
+++ /dev/null
@@ -1,8 +0,0 @@
-#version 120
-
-uniform sampler2D color_texture;
-uniform vec4 color;
-
-void main (void) {
-    gl_FragColor = texture2D(color_texture, gl_TexCoord[0].st) * color;
-}
diff --git a/data/shaders/sprite-vertex.glsl b/data/shaders/sprite-vertex.glsl
deleted file mode 100644
index d6efd3f..0000000
--- a/data/shaders/sprite-vertex.glsl
+++ /dev/null
@@ -1,26 +0,0 @@
-#version 120
-
-uniform mat4 projection;
-uniform vec2 position;
-uniform vec2 anchor;
-uniform vec2 scale;
-uniform float rotation;
-
-void main(void) {
-    mat4 rotationMatrix = mat4(cos(rotation), -sin(rotation), 0.0, 0.0,
-                               sin(rotation), cos(rotation),  0.0, 0.0,
-                               0.0,           0.0,            1.0, 0.0,
-                               0.0,           0.0,            0.0, 1.0);
-    mat4 translationMatrix = mat4(1.0, 0.0, 0.0, position.x - anchor.x,
-                                  0.0, 1.0, 0.0, position.y - anchor.y,
-                                  0.0, 0.0, 1.0, 0.0,
-                                  0.0, 0.0, 0.0, 1.0);
-    mat4 scaleMatrix = mat4(scale.x, 0.0,     0.0, 0.0,
-                            0.0,     scale.y, 0.0, 0.0,
-                            0.0,     0.0,     1.0, 0.0,
-                            0.0,     0.0,     0.0, 1.0);
-
-    gl_Position = projection * (gl_Vertex * scaleMatrix *
-                                rotationMatrix * translationMatrix);
-    gl_TexCoord[0] = gl_MultiTexCoord0;
-}