mesa: add glsl version query (v4)

Add support for GL_NUM_SHADING_LANGUAGE_VERSIONS
and glGetStringi for GL_SHADING_LANGUAGE_VERSION

v2:
  - Combine similar functionality into
    _mesa_get_shading_language_version() function.
  - Change GLSL version return mechanism.
v3:
  - Add return of empty string for GLSL ver 1.10.
  - Move _mesa_get_shading_language_version() function
    to src/mesa/main/version.c.
v4:
  - Add OpenGL version check.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=104915
Signed-off-by: Andriy Khulap <[email protected]>
Signed-off-by: Vadym Shovkoplias <[email protected]>
Reviewed-by: Brian Paul <[email protected]>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/mesa/main/getstring.c b/src/mesa/main/getstring.c
index 931f6a476cb..3d5ae0b694b 100644
--- a/src/mesa/main/getstring.c
+++ b/src/mesa/main/getstring.c
@@ -32,6 +32,7 @@
 #include "extensions.h"
 #include "mtypes.h"
 #include "macros.h"
+#include "version.h"
 
 /**
  * Return the string for a glGetString(GL_SHADING_LANGUAGE_VERSION) query.
@@ -186,6 +187,25 @@ _mesa_GetStringi(GLenum name, GLuint index)
          return (const GLubyte *) 0;
       }
       return _mesa_get_enabled_extension(ctx, index);
+   case GL_SHADING_LANGUAGE_VERSION:
+      {
+         char *version;
+         int num;
+         if (!_mesa_is_desktop_gl(ctx) || ctx->Version < 43) {
+            _mesa_error(ctx, GL_INVALID_ENUM,
+                        "glGetStringi(GL_SHADING_LANGUAGE_VERSION): "
+                        "supported only in GL4.3 and later");
+            return (const GLubyte *) 0;
+         }
+         num = _mesa_get_shading_language_version(ctx, index, &version);
+         if (index >= num) {
+            _mesa_error(ctx, GL_INVALID_VALUE,
+                        "glGetStringi(GL_SHADING_LANGUAGE_VERSION, index=%d)",
+                        index);
+            return (const GLubyte *) 0;
+         }
+         return (const GLubyte *) version;
+      }
    default:
       _mesa_error(ctx, GL_INVALID_ENUM, "glGetStringi");
       return (const GLubyte *) 0;