vrend: Signal the guest that indirect arrays are available

Closes: #74

v2: * Enable enhanced layouts in the guest only when the host supports
      it, because with indirect arrays enabled we re-emit the layout
      the guest send.
    * enable indirect arrays independently from the host capabilities
      (following Eriks comments)

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-By: Gurchetan Singh <gurchetansingh@chromium.org>

src/virgl_hw.h

@@ -246,6 +246,7 @@ enum virgl_formats {
 #define VIRGL_CAP_INDIRECT_PARAMS      (1 << 22)
 #define VIRGL_CAP_TRANSFORM_FEEDBACK3  (1 << 23)
 #define VIRGL_CAP_3D_ASTC              (1 << 24)
+#define VIRGL_CAP_INDIRECT_INPUT_ADDR  (1 << 25)
 
 /* virgl bind flags - these are compatible with mesa 10.5 gallium.
  * but are fixed, no other should be passed to virgl either.

src/vrend_renderer.c

@@ -8734,8 +8734,10 @@ static void vrend_renderer_fill_caps_v2(int gl_ver, int gles_ver,  union virgl_c
    if (has_feature(feat_texture_barrier))
       caps->v2.capability_bits |= VIRGL_CAP_TEXTURE_BARRIER;
 
-   /* always enable this since it doesn't require an ext to pass tests */
+   /* If we enable input arrays and don't have enhanced layouts then we
-   caps->v2.capability_bits |= VIRGL_CAP_TGSI_COMPONENTS;
+    * can't support components. */
+   if (has_feature(feat_enhanced_layouts))
+      caps->v2.capability_bits |= VIRGL_CAP_TGSI_COMPONENTS;
 
    if (has_feature(feat_srgb_write_control))
       caps->v2.capability_bits |= VIRGL_CAP_SRGB_WRITE_CONTROL;
@@ -8794,6 +8796,8 @@ static void vrend_renderer_fill_caps_v2(int gl_ver, int gles_ver,  union virgl_c
 
    if (epoxy_has_gl_extension("GL_KHR_texture_compression_astc_sliced_3d"))
       caps->v2.capability_bits |= VIRGL_CAP_3D_ASTC;
+
+   caps->v2.capability_bits |= VIRGL_CAP_INDIRECT_INPUT_ADDR;
 }
 
 void vrend_renderer_fill_caps(uint32_t set, UNUSED uint32_t version,

src/vrend_shader.c

@@ -4262,7 +4262,6 @@ iter_instruction(struct tgsi_iterate_context *iter,
 
       if (require_enhanced_layouts) {
          ctx->shader_req_bits |= SHADER_REQ_ENHANCED_LAYOUTS;
-         ctx->shader_req_bits |= SHADER_REQ_SEPERATE_SHADER_OBJECTS;
       }
 
       /* Vertex shader inputs are not send as arrays, but the access may still be