Mesa (master): gallium/u_tests: test a NULL constant buffer

[Marek Olšák]

Module: Mesa
Branch: master
Commit: 56e709bffb626fff6bbb7f7da81ffe23ab96b878
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=56e709bffb626fff6bbb7f7da81ffe23ab96b878

Author: Marek Olšák <marek.olsak at amd.com>
Date:   Sun Feb  1 13:11:49 2015 +0100

gallium/u_tests: test a NULL constant buffer

This expects (0,0,0,0), though it can be changed to something else or allow
more than one set of values to be considered correct.

This is currently the radeonsi behavior.

Reviewed-by: Glenn Kennard <glenn.kennard at gmail.com>

---

 src/gallium/auxiliary/util/u_tests.c |   57 ++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/src/gallium/auxiliary/util/u_tests.c b/src/gallium/auxiliary/util/u_tests.c
index 1011153..5257b54 100644
--- a/src/gallium/auxiliary/util/u_tests.c
+++ b/src/gallium/auxiliary/util/u_tests.c
@@ -30,9 +30,11 @@
 #include "util/u_draw_quad.h"
 #include "util/u_format.h"
 #include "util/u_inlines.h"
+#include "util/u_memory.h"
 #include "util/u_simple_shaders.h"
 #include "util/u_surface.h"
 #include "util/u_tile.h"
+#include "tgsi/tgsi_text.h"
 #include "cso_cache/cso_context.h"
 #include <stdio.h>
 
@@ -371,6 +373,60 @@ null_sampler_view(struct pipe_context *ctx)
    util_report_result(pass);
 }
 
+static void
+null_constant_buffer(struct pipe_context *ctx)
+{
+   struct cso_context *cso;
+   struct pipe_resource *cb;
+   void *fs, *vs;
+   bool pass = true;
+   static const float zero[] = {0, 0, 0, 0};
+
+   cso = cso_create_context(ctx);
+   cb = util_create_texture2d(ctx->screen, 256, 256,
+                              PIPE_FORMAT_R8G8B8A8_UNORM);
+   util_set_common_states_and_clear(cso, ctx, cb);
+
+   ctx->set_constant_buffer(ctx, PIPE_SHADER_FRAGMENT, 0, NULL);
+
+   /* Fragment shader. */
+   {
+      static const char *text = /* I don't like ureg... */
+            "FRAG\n"
+            "DCL CONST[0]\n"
+            "DCL OUT[0], COLOR\n"
+
+            "MOV OUT[0], CONST[0]\n"
+            "END\n";
+      struct tgsi_token tokens[1000];
+      struct pipe_shader_state state = {tokens};
+
+      if (!tgsi_text_translate(text, tokens, Elements(tokens))) {
+         puts("Can't compile a fragment shader.");
+         util_report_result(FAIL);
+         return;
+      }
+      fs = ctx->create_fs_state(ctx, &state);
+      cso_set_fragment_shader_handle(cso, fs);
+   }
+
+   /* Vertex shader. */
+   vs = util_set_passthrough_vertex_shader(cso, ctx, false);
+   util_draw_fullscreen_quad(cso);
+
+   /* Probe pixels. */
+   pass = pass && util_probe_rect_rgba(ctx, cb, 0, 0, cb->width0,
+                                       cb->height0, zero);
+
+   /* Cleanup. */
+   cso_destroy_context(cso);
+   ctx->delete_vs_state(ctx, vs);
+   ctx->delete_fs_state(ctx, fs);
+   pipe_resource_reference(&cb, NULL);
+
+   util_report_result(pass);
+}
+
 /**
  * Run all tests. This should be run with a clean context after
  * context_create.
@@ -382,6 +438,7 @@ util_run_tests(struct pipe_screen *screen)
 
    tgsi_vs_window_space_position(ctx);
    null_sampler_view(ctx);
+   null_constant_buffer(ctx);
 
    ctx->destroy(ctx);