tests: add a simple blitter test

this just blits a piece from one resource to another, then
reads back the second one.

tests/test_virgl_cmd.c

@@ -75,7 +75,7 @@ START_TEST(virgl_test_clear)
     virgl_encode_clear(&ctx, PIPE_CLEAR_COLOR0, &color, 0.0, 0);
 
     /* submit the cmd stream */
-    virgl_renderer_submit_cmd(ctx.cbuf->buf, 1, ctx.cbuf->cdw);
+    virgl_renderer_submit_cmd(ctx.cbuf->buf, ctx.ctx_id, ctx.cbuf->cdw);
 
     /* read back the cleared values in the resource */
     box.x = 0;
@@ -94,12 +94,103 @@ START_TEST(virgl_test_clear)
     }
 
     /* cleanup */
-    virgl_renderer_ctx_detach_resource(1, res.handle);
+    virgl_renderer_ctx_detach_resource(ctx.ctx_id, res.handle);
 
     testvirgl_destroy_backed_res(&res);
 
     testvirgl_fini_ctx_cmdbuf(&ctx);
 }
+END_TEST 
+
+START_TEST(virgl_test_blit_simple)
+{
+    struct virgl_context ctx;
+    struct virgl_resource res, res2;
+    struct virgl_surface surf;
+    struct pipe_framebuffer_state fb_state;
+    union pipe_color_union color;
+    struct pipe_blit_info blit;
+    struct virgl_box box;
+    int ret;
+    int i;
+
+    ret = testvirgl_init_ctx_cmdbuf(&ctx);
+    ck_assert_int_eq(ret, 0);
+
+    /* init and create simple 2D resource */
+    ret = testvirgl_create_backed_simple_2d_res(&res, 1);
+    ck_assert_int_eq(ret, 0);
+
+    /* init and create simple 2D resource */
+    ret = testvirgl_create_backed_simple_2d_res(&res2, 2);
+    ck_assert_int_eq(ret, 0);
+
+    /* attach resource to context */
+    virgl_renderer_ctx_attach_resource(ctx.ctx_id, res.handle);
+    virgl_renderer_ctx_attach_resource(ctx.ctx_id, res2.handle);
+
+        /* create a surface for the resource */
+    memset(&surf, 0, sizeof(surf));
+    surf.base.format = PIPE_FORMAT_B8G8R8X8_UNORM;
+    surf.handle = 1;
+    surf.base.texture = &res.base;
+
+    virgl_encoder_create_surface(&ctx, surf.handle, &res, &surf.base);
+
+    /* set the framebuffer state */
+    fb_state.nr_cbufs = 1;
+    fb_state.zsbuf = NULL;
+    fb_state.cbufs[0] = &surf.base;
+    virgl_encoder_set_framebuffer_state(&ctx, &fb_state);
+
+    /* clear the resource */
+    /* clear buffer to green */
+    color.f[0] = 0.0;
+    color.f[1] = 1.0;
+    color.f[2] = 0.0;
+    color.f[3] = 1.0;
+    virgl_encode_clear(&ctx, PIPE_CLEAR_COLOR0, &color, 0.0, 0);
+
+    memset(&blit, 0, sizeof(blit));
+    blit.mask = PIPE_MASK_RGBA;
+    blit.dst.format = res2.base.format;
+    blit.dst.box.width = 10;
+    blit.dst.box.height = 1;
+    blit.dst.box.depth = 1;
+    blit.src.format = res.base.format;
+    blit.src.box.width = 10;
+    blit.src.box.height = 1;
+    blit.src.box.depth = 1;
+    virgl_encode_blit(&ctx, &res2, &res, &blit);
+
+    /* submit the cmd stream */
+    virgl_renderer_submit_cmd(ctx.cbuf->buf, ctx.ctx_id, ctx.cbuf->cdw);
+
+    /* read back the cleared values in the resource */
+    box.x = 0;
+    box.y = 0;
+    box.z = 0;
+    box.w = 5;
+    box.h = 1;
+    box.d = 1;
+    ret = virgl_renderer_transfer_read_iov(res2.handle, ctx.ctx_id, 0, 50, 0, &box, 0, NULL, 0);
+    ck_assert_int_eq(ret, 0);
+
+    /* check the returned values */
+    for (i = 0; i < 5; i++) {
+	uint32_t *ptr = res2.iovs[0].iov_base;
+	ck_assert_int_eq(ptr[i], 0xff00ff00);
+    }
+
+    /* cleanup */
+    virgl_renderer_ctx_detach_resource(ctx.ctx_id, res2.handle);
+    virgl_renderer_ctx_detach_resource(ctx.ctx_id, res.handle);
+
+    testvirgl_destroy_backed_res(&res);
+    testvirgl_destroy_backed_res(&res2);
+
+    testvirgl_fini_ctx_cmdbuf(&ctx);
+}
 END_TEST
 
 Suite *virgl_init_suite(void)
@@ -111,6 +202,7 @@ Suite *virgl_init_suite(void)
   tc_core = tcase_create("clear");
 
   tcase_add_test(tc_core, virgl_test_clear);
+  tcase_add_test(tc_core, virgl_test_blit_simple);
   suite_add_tcase(s, tc_core);
   return s;