context: use GL_BGRA_EXT to avoid undeclared exts

GL_BGRA is not declared on older systems so we use the extension
constant.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

diff --git a/src/output_context.c b/src/output_context.c
index 2adcc86..29bfda1 100644 (file)
--- a/src/output_context.c
+++ b/src/output_context.c
@@ -674,7 +674,7 @@ void kmscon_context_set_tex(struct kmscon_context *ctx, unsigned int tex,
                return;
 
        glBindTexture(GL_TEXTURE_2D, tex);
-       glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_BGRA,
+       glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_BGRA_EXT,
                                                GL_UNSIGNED_BYTE, buf);
 }