meta: Add support for CUBE_MAP_ARRAY to generatemipmap.

I added support to bind_fbo_image in the process of building meta
CopyTexSubImage, and found that it broke generatemipmap because previously
we would just throw a GL error there and then end up with an incomplete
FBO and fallback.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/common/meta.c

@@ -110,6 +110,7 @@ _mesa_meta_bind_fbo_image(struct gl_texture_image *texImage, GLuint layer)
       break;
    case GL_TEXTURE_1D_ARRAY:
    case GL_TEXTURE_2D_ARRAY:
+   case GL_TEXTURE_CUBE_MAP_ARRAY:
    case GL_TEXTURE_3D:
       _mesa_FramebufferTextureLayer(GL_FRAMEBUFFER,
                                     GL_COLOR_ATTACHMENT0,
@@ -2457,6 +2458,9 @@ _mesa_meta_setup_texture_coords(GLenum faceTarget,
    GLuint i;
    GLfloat r;
 
+   if (faceTarget == GL_TEXTURE_CUBE_MAP_ARRAY)
+      faceTarget = GL_TEXTURE_CUBE_MAP_POSITIVE_X + slice % 6;
+
    /* Currently all texture targets want the W component to be 1.0.
     */
    coords0[3] = 1.0F;

src/mesa/drivers/common/meta_generate_mipmap.c

@@ -189,7 +189,7 @@ _mesa_meta_GenerateMipmap(struct gl_context *ctx, GLenum target,
     */
    if (use_glsl_version) {
       _mesa_meta_setup_vertex_objects(&mipmap->VAO, &mipmap->VBO, true,
-                                      2, 3, 0);
+                                      2, 4, 0);
       _mesa_meta_setup_blit_shader(ctx, target, &mipmap->shaders);
    } else {
       _mesa_meta_setup_ff_tnl_for_blit(&mipmap->VAO, &mipmap->VBO, 3);