[waffle] [PATCH 2/3] examples/gl_basic: make glReadPixels available

[Jordan Justen]

Signed-off-by: Jordan Justen <jordan.l.justen at intel.com>
---
 examples/gl_basic.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/examples/gl_basic.c b/examples/gl_basic.c
index e9744c4..628c25d 100644
--- a/examples/gl_basic.c
+++ b/examples/gl_basic.c
@@ -105,9 +105,15 @@ error_get_gl_symbol(const char *name)
 
 typedef float GLclampf;
 typedef unsigned int GLbitfield;
+typedef unsigned int GLint;
+typedef int GLsizei;
+typedef unsigned int GLenum;
+typedef void GLvoid;
 
 enum {
     // Copied for <GL/gl.h>.
+    GL_UNSIGNED_BYTE =    0x00001401,
+    GL_RGBA =             0x00001908,
     GL_COLOR_BUFFER_BIT = 0x00004000,
 };
 
@@ -116,6 +122,8 @@ enum {
 
 static void (*glClearColor)(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
 static void (*glClear)(GLbitfield mask);
+static void (*glReadPixels)(GLint x, GLint y, GLsizei width, GLsizei height,
+                            GLenum format, GLenum type, GLvoid* data);
 
 /// @}
 /// @defgroup Parsing Options
@@ -335,6 +343,10 @@ main(int argc, char **argv)
     if (!glClearColor)
         error_get_gl_symbol("glClearColor");
 
+    glReadPixels = waffle_dl_sym(opts.dl, "glReadPixels");
+    if (!glReadPixels)
+        error_get_gl_symbol("glReadPixels");
+
     dpy = waffle_display_connect(opts.display_name);
     if (!dpy)
         error_waffle();
-- 
1.7.9.5