zink: support GL_OVR_multiview

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31128>

src/gallium/drivers/zink/nir_to_spirv/nir_to_spirv.c

@@ -97,7 +97,7 @@ struct ntv_context {
          workgroup_id_var, num_workgroups_var,
          local_invocation_id_var, global_invocation_id_var,
          local_invocation_index_var, helper_invocation_var,
-         local_group_size_var,
+         local_group_size_var, view_index_var,
          base_vertex_var, base_instance_var, draw_id_var;
 
    SpvId shared_mem_size;
@@ -2614,6 +2614,24 @@ emit_load_front_face(struct ntv_context *ctx, nir_intrinsic_instr *intr)
    store_def(ctx, intr->def.index, result, nir_type_bool);
 }
 
+static void
+emit_load_view_index(struct ntv_context *ctx, nir_intrinsic_instr *intr)
+{
+   SpvId var_type = spirv_builder_type_uint(&ctx->builder, 32);
+   spirv_builder_emit_extension(&ctx->builder, "SPV_KHR_multiview");
+   spirv_builder_emit_cap(&ctx->builder, SpvCapabilityMultiView);
+   if (!ctx->view_index_var)
+      ctx->view_index_var = create_builtin_var(ctx, var_type,
+                                               SpvStorageClassInput,
+                                               "gl_ViewIndex",
+                                               SpvBuiltInViewIndex);
+
+   SpvId result = spirv_builder_emit_load(&ctx->builder, var_type,
+                                          ctx->view_index_var);
+   assert(1 == intr->def.num_components);
+   store_def(ctx, intr->def.index, result, nir_type_uint);
+}
+
 static void
 emit_load_uint_input(struct ntv_context *ctx, nir_intrinsic_instr *intr, SpvId *var_id, const char *var_name, SpvBuiltIn builtin)
 {
@@ -3278,6 +3296,10 @@ emit_intrinsic(struct ntv_context *ctx, nir_intrinsic_instr *intr)
       emit_load_front_face(ctx, intr);
       break;
 
+   case nir_intrinsic_load_view_index:
+      emit_load_view_index(ctx, intr);
+      break;
+
    case nir_intrinsic_load_base_instance:
       emit_load_uint_input(ctx, intr, &ctx->base_instance_var, "gl_BaseInstance", SpvBuiltInBaseInstance);
       break;

src/gallium/drivers/zink/zink_context.c

@@ -2771,6 +2771,7 @@ zink_update_rendering_info(struct zink_context *ctx)
       struct zink_surface *surf = zink_csurface(ctx->fb_state.cbufs[i]);
       ctx->gfx_pipeline_state.rendering_formats[i] = surf ? surf->info.format[0] : VK_FORMAT_UNDEFINED;
    }
+   ctx->gfx_pipeline_state.rendering_info.viewMask = ctx->fb_state.viewmask;
    ctx->gfx_pipeline_state.rendering_info.depthAttachmentFormat = VK_FORMAT_UNDEFINED;
    ctx->gfx_pipeline_state.rendering_info.stencilAttachmentFormat = VK_FORMAT_UNDEFINED;
    if (ctx->fb_state.zsbuf && zink_is_zsbuf_used(ctx)) {
@@ -3296,6 +3297,7 @@ hash_rendering_state(const void *key)
    const VkPipelineRenderingCreateInfo *info = key;
    uint32_t hash = 0;
    /*
+    uint32_t           viewMask;
     uint32_t           colorAttachmentCount;
     const VkFormat*    pColorAttachmentFormats;
     VkFormat           depthAttachmentFormat;
@@ -3303,6 +3305,7 @@ hash_rendering_state(const void *key)
     * this data is not optimally arranged, so it must be manually hashed
     */
    hash = XXH32(&info->colorAttachmentCount, sizeof(uint32_t), hash);
+   hash = XXH32(&info->viewMask, sizeof(uint32_t), hash);
    hash = XXH32(&info->depthAttachmentFormat, sizeof(uint32_t), hash);
    hash = XXH32(&info->stencilAttachmentFormat, sizeof(VkFormat), hash);
    return XXH32(info->pColorAttachmentFormats, sizeof(VkFormat) * info->colorAttachmentCount, hash);
@@ -3315,6 +3318,7 @@ equals_rendering_state(const void *a, const void *b)
    const VkPipelineRenderingCreateInfo *bi = b;
    return ai->colorAttachmentCount == bi->colorAttachmentCount &&
           ai->depthAttachmentFormat == bi->depthAttachmentFormat &&
+          ai->viewMask == bi->viewMask &&
           ai->stencilAttachmentFormat == bi->stencilAttachmentFormat &&
           !memcmp(ai->pColorAttachmentFormats, bi->pColorAttachmentFormats, sizeof(VkFormat) * ai->colorAttachmentCount);
 }
@@ -3800,6 +3804,8 @@ zink_set_framebuffer_state(struct pipe_context *pctx,
    ctx->dynamic_fb.info.colorAttachmentCount = ctx->fb_state.nr_cbufs;
    ctx->rp_changed |= ctx->dynamic_fb.info.layerCount != layers;
    ctx->dynamic_fb.info.layerCount = layers;
+   ctx->rp_changed |= ctx->dynamic_fb.info.viewMask != state->viewmask;
+   ctx->dynamic_fb.info.viewMask = state->viewmask;
    ctx->gfx_pipeline_state.rendering_info.colorAttachmentCount = ctx->fb_state.nr_cbufs;
 
    ctx->void_clears = 0;

src/gallium/drivers/zink/zink_program.h

@@ -413,6 +413,7 @@ zink_can_use_pipeline_libs(const struct zink_context *ctx)
           !zink_get_fs_base_key(ctx)->fbfetch_ms &&
           !ctx->gfx_pipeline_state.force_persample_interp &&
           !ctx->gfx_pipeline_state.min_samples &&
+          !ctx->fb_state.viewmask &&
           !ctx->is_generated_gs_bound;
 }
 

src/gallium/drivers/zink/zink_screen.c

@@ -555,6 +555,8 @@ zink_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    switch (param) {
    case PIPE_CAP_NULL_TEXTURES:
       return screen->info.rb_image_feats.robustImageAccess;
+   case PIPE_CAP_MULTIVIEW:
+      return screen->info.have_vulkan13 ? screen->info.feats11.multiview : 0;
    case PIPE_CAP_TEXRECT:
    case PIPE_CAP_MULTI_DRAW_INDIRECT_PARTIAL_STRIDE:
       return 0;