vrend,caps: unify GLSL version evaluation (v4)

Since the gles code path is now reduced to just setting the gles
version, move all the glsl stuff into one place.

v3: remove now unused parameter gl_ver
v4: rebase after image and compute shader patches landed
v5: rework logic a bit taking Eriks suggestion into account

Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org> (v3)
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Signed-off-by: Jakob Bornecrantz <jakob@collabora.com>

src/vrend_renderer.c

@@ -7797,9 +7797,6 @@ static void vrend_renderer_fill_caps_common(union virgl_caps *caps)
     */
    caps->v1.bset.occlusion_query = 1;
 
-   /* Set an initial level here, will be updated later */
-   caps->v1.glsl_level = 130;
-
    /* Set supported prims here as we now know what shaders we support. */
    caps->v1.prim_mask = (1 << PIPE_PRIM_POINTS) | (1 << PIPE_PRIM_LINES) |
                         (1 << PIPE_PRIM_LINE_STRIP) | (1 << PIPE_PRIM_LINE_LOOP) |
@@ -7857,19 +7854,18 @@ static void vrend_renderer_fill_caps_v2_common(union virgl_caps *caps)
    glGetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, (GLint*)&caps->v2.uniform_buffer_offset_alignment);
 }
 
-static void vrend_renderer_fill_caps_gles(int gles_ver, union virgl_caps *caps)
+static void vrend_fill_caps_glsl_version(int gl_ver, int gles_ver,
+					  union virgl_caps *caps)
 {
-   if (gles_ver >= 30) {
-      caps->v1.glsl_level = 130;
-   } else {
+   if (gles_ver > 0) {
       caps->v1.glsl_level = 120;
-   }
+
+      if (gles_ver >= 30)
+         caps->v1.glsl_level = 130;
    }
 
-static void vrend_renderer_fill_caps_gl(bool fill_capset2, int gl_ver,
-					  union virgl_caps *caps)
-{
-   GLfloat range[2];
+   if (gl_ver > 0) {
+      caps->v1.glsl_level = 130;
 
       if (gl_ver == 31)
          caps->v1.glsl_level = 140;
@@ -7885,6 +7881,12 @@ static void vrend_renderer_fill_caps_gl(bool fill_capset2, int gl_ver,
          caps->v1.glsl_level = 420;
       else if (gl_ver >= 43)
          caps->v1.glsl_level = 430;
+   }
+}
+
+static void vrend_renderer_fill_caps_gl(bool fill_capset2, union virgl_caps *caps)
+{
+   GLfloat range[2];
 
    if (!vrend_state.use_core_profile) {
       caps->v1.bset.poly_stipple = 1;
@@ -7939,12 +7941,10 @@ void vrend_renderer_fill_caps(uint32_t set, UNUSED uint32_t version,
    }
 
    vrend_renderer_fill_caps_common(caps);
+   vrend_fill_caps_glsl_version(gl_ver, gles_ver, caps);
 
-   /* GLES has it's own path */
-   if (vrend_state.use_gles) {
-      vrend_renderer_fill_caps_gles(gles_ver, caps);
-   } else
-      vrend_renderer_fill_caps_gl(fill_capset2, gl_ver, caps);
+   if (!vrend_state.use_gles)
+      vrend_renderer_fill_caps_gl(fill_capset2, caps);
 
    if (caps->v1.glsl_level >= 150) {
       caps->v1.prim_mask |= (1 << PIPE_PRIM_LINES_ADJACENCY) |