vrend: implement ARB_clear_texture

Signed-off-by: Elie Tournier <elie.tournier@collabora.com>
Reviewed-by: Gert Wollny <gert.wollny@collabora.com>

src/virgl_protocol.h

@@ -102,6 +102,7 @@ enum virgl_context_cmd {
    VIRGL_CCMD_END_TRANSFERS,
    VIRGL_CCMD_COPY_TRANSFER3D,
    VIRGL_CCMD_SET_TWEAKS,
+   VIRGL_CCMD_CLEAR_TEXTURE,
    VIRGL_MAX_COMMANDS
 };
 
@@ -605,4 +606,19 @@ enum vrend_tweak_type {
    virgl_tweak_undefined
 };
 
-#endif
+/* Clear texture */
+#define VIRGL_CLEAR_TEXTURE_SIZE 12
+#define VIRGL_TEXTURE_HANDLE 1
+#define VIRGL_TEXTURE_LEVEL 2
+#define VIRGL_TEXTURE_SRC_X 3
+#define VIRGL_TEXTURE_SRC_Y 4
+#define VIRGL_TEXTURE_SRC_Z 5
+#define VIRGL_TEXTURE_SRC_W 6
+#define VIRGL_TEXTURE_SRC_H 7
+#define VIRGL_TEXTURE_SRC_D 8
+#define VIRGL_TEXTURE_ARRAY_A 9
+#define VIRGL_TEXTURE_ARRAY_B 10
+#define VIRGL_TEXTURE_ARRAY_C 11
+#define VIRGL_TEXTURE_ARRAY_D 12
+
+#endif

src/vrend_debug.c

@@ -75,7 +75,8 @@ static const char *command_names[VIRGL_MAX_COMMANDS] = {
    "TRANSFER3D",
    "END_TRANSFERS",
    "COPY_TRANSFER3D",
-   "TWEAK"
+   "TWEAK",
+   "CLEAR_TEXTURE"
 };
 
 static const char *object_type_names[VIRGL_MAX_OBJECTS] = {

src/vrend_decode.c

@@ -211,6 +211,33 @@ static int vrend_decode_clear(struct vrend_decode_ctx *ctx, int length)
    return 0;
 }
 
+static int vrend_decode_clear_texture(struct vrend_decode_ctx *ctx, int length)
+{
+   struct pipe_box box;
+   uint32_t handle;
+   uint32_t level;
+   uint32_t arr[4] = {0};
+
+   if (length != VIRGL_CLEAR_TEXTURE_SIZE)
+      return EINVAL;
+
+   handle = get_buf_entry(ctx, VIRGL_TEXTURE_HANDLE);
+   level = get_buf_entry(ctx, VIRGL_TEXTURE_LEVEL);
+   box.x = get_buf_entry(ctx, VIRGL_TEXTURE_SRC_X);
+   box.y = get_buf_entry(ctx, VIRGL_TEXTURE_SRC_Y);
+   box.z = get_buf_entry(ctx, VIRGL_TEXTURE_SRC_Z);
+   box.width = get_buf_entry(ctx, VIRGL_TEXTURE_SRC_W);
+   box.height = get_buf_entry(ctx, VIRGL_TEXTURE_SRC_H);
+   box.depth = get_buf_entry(ctx, VIRGL_TEXTURE_SRC_D);
+   arr[0] = get_buf_entry(ctx, VIRGL_TEXTURE_ARRAY_A);
+   arr[1] = get_buf_entry(ctx, VIRGL_TEXTURE_ARRAY_B);
+   arr[2] = get_buf_entry(ctx, VIRGL_TEXTURE_ARRAY_C);
+   arr[3] = get_buf_entry(ctx, VIRGL_TEXTURE_ARRAY_D);
+
+   vrend_clear_texture(ctx->grctx, handle, level, &box, (void *) &arr);
+   return 0;
+}
+
 static float uif(unsigned int ui)
 {
    union { float f; unsigned int ui; } myuif;
@@ -1496,6 +1523,9 @@ static int vrend_decode_ctx_submit_cmd(struct virgl_context *ctx,
       case VIRGL_CCMD_CLEAR:
          ret = vrend_decode_clear(gdctx, len);
          break;
+      case VIRGL_CCMD_CLEAR_TEXTURE:
+         ret = vrend_decode_clear_texture(gdctx, len);
+         break;
       case VIRGL_CCMD_DRAW_VBO:
          ret = vrend_decode_draw_vbo(gdctx, len);
          break;

src/vrend_renderer.c

@@ -3720,6 +3720,38 @@ void vrend_clear(struct vrend_context *ctx,
       glDisable(GL_SCISSOR_TEST);
 }
 
+void vrend_clear_texture(struct vrend_context* ctx,
+                         uint32_t handle, uint32_t level,
+                         const struct pipe_box *box,
+                         const void * data)
+{
+   GLenum format, type;
+   struct vrend_resource *res;
+
+   if (handle)
+      res = vrend_renderer_ctx_res_lookup(ctx, handle);
+   else {
+      vrend_printf( "cannot find resource for handle %d\n", handle);
+      return;
+   }
+
+   enum virgl_formats fmt = vrend_format_replace_emulated(res->base.bind, res->base.format);
+   format = tex_conv_table[fmt].glformat;
+   type = tex_conv_table[fmt].gltype;
+
+   if (vrend_state.use_gles) {
+      glClearTexSubImageEXT(res->id, level,
+                            box->x, box->y, box->z,
+                            box->width, box->height, box->depth,
+                            format, type, data);
+   } else {
+      glClearTexSubImage(res->id, level,
+                         box->x, box->y, box->z,
+                         box->width, box->height, box->depth,
+                         format, type, data);
+   }
+}
+
 static void vrend_update_scissor_state(struct vrend_context *ctx)
 {
    struct pipe_scissor_state *ss;

src/vrend_renderer.h

@@ -154,6 +154,11 @@ void vrend_clear(struct vrend_context *ctx,
                  const union pipe_color_union *color,
                  double depth, unsigned stencil);
 
+void vrend_clear_texture(struct vrend_context* ctx,
+                         uint32_t handle, uint32_t level,
+                         const struct pipe_box *box,
+                         const void * data);
+
 int vrend_draw_vbo(struct vrend_context *ctx,
                    const struct pipe_draw_info *info,
                    uint32_t cso, uint32_t indirect_handle, uint32_t indirect_draw_count_handle);