From dd35ec3c1a087ffe14367643c040f8012d9f70bc Mon Sep 17 00:00:00 2001
From: David Thompson <davet@gnu.org>
Date: Mon, 25 Jun 2018 04:30:14 -0400
Subject: Remove problematic OpenGL requirements.

Trying to force certain GL versions and other attributes has only
caused problems for potential users thus far.  Let's see how far we
get by just removing this stuff.

* chickadee/window.scm (open-window): Remove OpenGL settings.
* chickadee/render/shapes.scm (draw-filled-rect, draw-line): Drop
shader version from 330 to 130.
* chickadee/render/sprite.scm (default-shader): Same.
---
 chickadee/render/shapes.scm |  8 ++++----
 chickadee/render/sprite.scm |  4 ++--
 chickadee/window.scm        | 10 ----------
 3 files changed, 6 insertions(+), 16 deletions(-)

diff --git a/chickadee/render/shapes.scm b/chickadee/render/shapes.scm
index d2e2ca2..70efef1 100644
--- a/chickadee/render/shapes.scm
+++ b/chickadee/render/shapes.scm
@@ -55,7 +55,7 @@
            (delay
              (strings->shader
               "
-#version 330
+#version 130
 
 in vec2 position;
 uniform mat4 mvp;
@@ -65,7 +65,7 @@ void main(void) {
 }
 "
               "
-#version 330
+#version 130
 
 in vec2 frag_tex;
 uniform vec4 color;
@@ -129,7 +129,7 @@ void main (void) {
            (delay
              (strings->shader
               "
-#version 330
+#version 130
 
 in vec2 position;
 in vec2 tex;
@@ -142,7 +142,7 @@ void main(void) {
 }
 "
               "
-#version 330
+#version 130
 
 in vec2 frag_tex;
 uniform vec4 color;
diff --git a/chickadee/render/sprite.scm b/chickadee/render/sprite.scm
index 9e96fc7..067384b 100644
--- a/chickadee/render/sprite.scm
+++ b/chickadee/render/sprite.scm
@@ -37,7 +37,7 @@
   (delay
     (strings->shader
      "
-#version 330
+#version 130
 
 in vec2 position;
 in vec2 tex;
@@ -50,7 +50,7 @@ void main(void) {
 }
 "
      "
-#version 330
+#version 130
 
 in vec2 frag_tex;
 uniform sampler2D color_texture;
diff --git a/chickadee/window.scm b/chickadee/window.scm
index 7f138c1..9598402 100644
--- a/chickadee/window.scm
+++ b/chickadee/window.scm
@@ -42,16 +42,6 @@
                       (width 640)
                       (height 480)
                       fullscreen?)
-  (sdl2:set-gl-attribute! 'context-major-version 3)
-  (sdl2:set-gl-attribute! 'context-minor-version 3)
-  (sdl2:set-gl-attribute! 'double-buffer 1)
-  (sdl2:set-gl-attribute! 'depth-size 24)
-  (sdl2:set-gl-attribute! 'red-size 8)
-  (sdl2:set-gl-attribute! 'green-size 8)
-  (sdl2:set-gl-attribute! 'blue-size 8)
-  (sdl2:set-gl-attribute! 'alpha-size 8)
-  (sdl2:set-gl-attribute! 'stencil-size 8)
-  (sdl2:set-gl-attribute! 'retained-backing 0)
   (let* ((sdl-window (sdl2:make-window #:opengl? #t
                                        #:title title
                                        #:size (list width height)
-- 
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