mesa: don't advertise bogus GL_ARB_shading_language_120 extension

Instead of using the invalid GL_ARB_shading_language_120 extension to
determine the GLSL version, use a new ctx->Const.GLSLVersion field.
Updated the intel and r600 drivers, but untested.

See fd.o bug 29910

NOTE: This is a candidate for the 7.9 branch (but let's wait and see if
there's any regressions).

5 files changed, 43 insertions, 18 deletions

diff --git a/src/mesa/main/context.c b/src/mesa/main/context.c
index b1f800f4c2..3bddf2570e 100644
--- a/src/mesa/main/context.c
+++ b/src/mesa/main/context.c
@@ -597,6 +597,21 @@ _mesa_init_constants(GLcontext *ctx)
    ctx->Const.MaxVarying = MAX_VARYING;
 #endif
 
+   /* Shading language version */
+   if (ctx->API == API_OPENGL) {
+#if FEATURE_ARB_shading_language_120
+      ctx->Const.GLSLVersion = 120;
+#else
+      ctx->Const.GLSLVersion = 110;
+#endif
+   }
+   else if (ctx->API == API_OPENGLES2) {
+      ctx->Const.GLSLVersion = 100;
+   }
+   else if (ctx->API == API_OPENGLES) {
+      ctx->Const.GLSLVersion = 0; /* GLSL not supported */
+   }
+
    /* GL_ARB_framebuffer_object */
    ctx->Const.MaxSamples = 0;
 
diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
index 50b97f5113..080fa98dfc 100644
--- a/src/mesa/main/extensions.c
+++ b/src/mesa/main/extensions.c
@@ -77,7 +77,6 @@ static const struct {
    { OFF, "GL_ARB_seamless_cube_map",          F(ARB_seamless_cube_map) },
    { OFF, "GL_ARB_shader_objects",             F(ARB_shader_objects) },
    { OFF, "GL_ARB_shading_language_100",       F(ARB_shading_language_100) },
-   { OFF, "GL_ARB_shading_language_120",       F(ARB_shading_language_120) },
    { OFF, "GL_ARB_shadow",                     F(ARB_shadow) },
    { OFF, "GL_ARB_shadow_ambient",             F(ARB_shadow_ambient) },
    { OFF, "GL_ARB_sync",                       F(ARB_sync) },
@@ -269,9 +268,6 @@ _mesa_enable_sw_extensions(GLcontext *ctx)
 #if FEATURE_ARB_shading_language_100
    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 #endif
-#if FEATURE_ARB_shading_language_120
-   ctx->Extensions.ARB_shading_language_120 = GL_TRUE;
-#endif
    ctx->Extensions.ARB_shadow = GL_TRUE;
    ctx->Extensions.ARB_shadow_ambient = GL_TRUE;
    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
@@ -513,9 +509,6 @@ _mesa_enable_2_1_extensions(GLcontext *ctx)
 #if FEATURE_EXT_texture_sRGB
    ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 #endif
-#if FEATURE_ARB_shading_language_120
-   ctx->Extensions.ARB_shading_language_120 = GL_TRUE;
-#endif
 }
 
 
diff --git a/src/mesa/main/getstring.c b/src/mesa/main/getstring.c
index 5e4fcd599c..3910047fb5 100644
--- a/src/mesa/main/getstring.c
+++ b/src/mesa/main/getstring.c
@@ -30,26 +30,42 @@
 #include "enums.h"
 #include "extensions.h"
 
+
+/**
+ * Return the string for a glGetString(GL_SHADING_LANGUAGE_VERSION) query.
+ */
 static const GLubyte *
 shading_language_version(GLcontext *ctx)
 {
    switch (ctx->API) {
-#if FEATURE_ARB_shading_language_100
    case API_OPENGL:
-      if (ctx->Extensions.ARB_shading_language_120)
-	 return (const GLubyte *) "1.20";
-      else if (ctx->Extensions.ARB_shading_language_100)
-	 return (const GLubyte *) "1.10";
-      goto error;
-#endif
+      if (!ctx->Extensions.ARB_shader_objects) {
+         _mesa_error(ctx, GL_INVALID_ENUM, "glGetString");
+         return (const GLubyte *) 0;
+      }
+
+      switch (ctx->Const.GLSLVersion) {
+      case 110:
+         return (const GLubyte *) "1.10";
+      case 120:
+         return (const GLubyte *) "1.20";
+      case 130:
+         return (const GLubyte *) "1.30";
+      default:
+         _mesa_problem(ctx,
+                       "Invalid GLSL version in shading_language_version()");
+         return (const GLubyte *) 0;
+      }
+      break;
 
    case API_OPENGLES2:
       return (const GLubyte *) "OpenGL ES GLSL ES 1.0.16";
 
    case API_OPENGLES:
+      /* fall-through */
+
    default:
-   error:
-      _mesa_error( ctx, GL_INVALID_ENUM, "glGetString" );
+      _mesa_problem(ctx, "Unexpected API value in shading_language_version()");
       return (const GLubyte *) 0;
    }
 }
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index fdf8100c8c..5494be8f42 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2608,6 +2608,8 @@ struct gl_constants
 
    GLuint MaxVarying;  /**< Number of float[4] varying parameters */
 
+   GLuint GLSLVersion;  /**< GLSL version supported (ex: 120 = 1.20) */
+
    /** Which texture units support GL_ATI_envmap_bumpmap as targets */
    GLbitfield SupportedBumpUnits;
 
@@ -2668,7 +2670,6 @@ struct gl_extensions
    GLboolean ARB_seamless_cube_map;
    GLboolean ARB_shader_objects;
    GLboolean ARB_shading_language_100;
-   GLboolean ARB_shading_language_120;
    GLboolean ARB_shadow;
    GLboolean ARB_shadow_ambient;
    GLboolean ARB_sync;
diff --git a/src/mesa/main/version.c b/src/mesa/main/version.c
index 9e1f5f2a4f..5997ca00fd 100644
--- a/src/mesa/main/version.c
+++ b/src/mesa/main/version.c
@@ -84,7 +84,7 @@ compute_version(GLcontext *ctx)
 			      (ctx->Extensions.EXT_stencil_two_side
 			       || ctx->Extensions.ATI_separate_stencil));
    const GLboolean ver_2_1 = (ver_2_0 &&
-                              ctx->Extensions.ARB_shading_language_120 &&
+                              ctx->Const.GLSLVersion >= 120 &&
                               ctx->Extensions.EXT_pixel_buffer_object &&
                               ctx->Extensions.EXT_texture_sRGB);
    const GLboolean ver_3_0 = (ver_2_1 &&