main: Fix deprecation of glLineWidth()

From section E.1 (Profiles and Deprecated Features of OpenGL 3.0)
of the OpenGL 3.0 spec:

    "LineWidth is not deprecated, but values greater than 1.0
    will generate an INVALID VALUE error"

From context it is clear that values greater than 1.0 should only
generate an INVALID VALUE error in a forward-compatible context.

The code was correctly quoting this spec text, but it was disallowing
all line widths in forward-compatible contexts, instead of just widths
greater than 1.0.

This patch introduces the correct check, so that setting a line width
of 1.0 or less is permitted.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

diff --git a/src/mesa/main/lines.c b/src/mesa/main/lines.c
index 0df9d66b056342ceb0e827ad6be5b476db1441db..3c08ed2e713d7cb5a0e11d17e8322c50d5788298 100644 (file)
--- a/src/mesa/main/lines.c
+++ b/src/mesa/main/lines.c
@@ -62,7 +62,8 @@ _mesa_LineWidth( GLfloat width )
     */
    if (ctx->API == API_OPENGL_CORE
        && ((ctx->Const.ContextFlags & GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT)
-           != 0)) {
+           != 0)
+       && width > 1.0) {
       _mesa_error( ctx, GL_INVALID_VALUE, "glLineWidth" );
       return;
    }