[Mesa-dev] [PATCH] virgl: add shader offset alignment to to v2 caps struct

[Gurchetan Singh]

From: "gurchetansingh at chromium.org" <gurchetansingh at chromium.org>

This is the SSBO analogue to fe0647. User supplied data must
be a multiple of GL_SHADER_STORAGE_BUFFER_OFFSET_ALIGNMENT.

This fixes 44 GLES31 tests on airlied@'s GLES31 sketch branches with
Nvidia hardware, but this patch standalone can applied to master. The
alignment restriction on Nvidia is 32, hence the default value.

Example tests:
   dEQP-GLES31.functional.ssbo.layout.random.all_shared_buffer.0
   dEQP-GLES31.functional.ssbo.layout.multi_basic_types.single_buffer.std430
---
 src/gallium/drivers/virgl/virgl_hw.h     | 1 +
 src/gallium/drivers/virgl/virgl_screen.c | 1 +
 src/gallium/drivers/virgl/virgl_winsys.h | 1 +
 3 files changed, 3 insertions(+)

diff --git a/src/gallium/drivers/virgl/virgl_hw.h b/src/gallium/drivers/virgl/virgl_hw.h
index 93849c03ddd..624be3b271d 100644
--- a/src/gallium/drivers/virgl/virgl_hw.h
+++ b/src/gallium/drivers/virgl/virgl_hw.h
@@ -286,6 +286,7 @@ struct virgl_caps_v2 {
         int32_t max_texture_gather_offset;
         uint32_t texture_buffer_offset_alignment;
         uint32_t uniform_buffer_offset_alignment;
+        uint32_t shader_buffer_offset_alignment;
 };
 
 union virgl_caps {
diff --git a/src/gallium/drivers/virgl/virgl_screen.c b/src/gallium/drivers/virgl/virgl_screen.c
index 02613f18663..886ea196bdd 100644
--- a/src/gallium/drivers/virgl/virgl_screen.c
+++ b/src/gallium/drivers/virgl/virgl_screen.c
@@ -228,6 +228,7 @@ virgl_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
    case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
+      return vscreen->caps.caps.v2.shader_buffer_offset_alignment;
    case PIPE_CAP_INVALIDATE_BUFFER:
    case PIPE_CAP_GENERATE_MIPMAP:
    case PIPE_CAP_SURFACE_REINTERPRET_BLOCKS:
diff --git a/src/gallium/drivers/virgl/virgl_winsys.h b/src/gallium/drivers/virgl/virgl_winsys.h
index 99e98ad9c9c..c36b957abad 100644
--- a/src/gallium/drivers/virgl/virgl_winsys.h
+++ b/src/gallium/drivers/virgl/virgl_winsys.h
@@ -134,5 +134,6 @@ static inline void virgl_ws_fill_new_caps_defaults(struct virgl_drm_caps *caps)
    caps->caps.v2.max_texture_gather_offset = 7;
    caps->caps.v2.texture_buffer_offset_alignment = 32;
    caps->caps.v2.uniform_buffer_offset_alignment = 256;
+   caps->caps.v2.shader_buffer_offset_alignment = 32;
 }
 #endif
-- 
2.13.5