1 files changed, 222 insertions, 0 deletions
diff --git a/src/gallium/tests/graw/fs-write-z.c b/src/gallium/tests/graw/fs-write-z.c
new file mode 100644
index 00000000000..186e3ec5034
--- /dev/null
+++ b/src/gallium/tests/graw/fs-write-z.c
@@ -0,0 +1,222 @@
+/* Test the writing Z in fragment shader.
+ * The red quad should be entirely in front of the blue quad even
+ * though the overlap and intersect in Z.
+ */
+
+#include <stdio.h>
+
+#include "graw_util.h"
+
+
+static int width = 300;
+static int height = 300;
+
+static struct graw_info info;
+
+
+struct vertex {
+   float position[4];
+   float color[4];
+};
+
+#define z0 0.2
+#define z01 0.5
+#define z1 0.4
+
+
+static struct vertex vertices[] =
+{
+   /* left quad: clock-wise, front-facing, red */
+   {
+      {-0.8, -0.9, z0, 1.0 },
+      { 1, 0, 0, 1 }
+   },
+
+   {
+      { -0.2, -0.9, z0, 1.0 },
+      { 1, 0, 0, 1 }
+   },
+
+   {
+      { 0.2,  0.9, z01, 1.0 },
+      { 1, 0, 0, 1 }
+   },
+
+   {
+      {-0.9,  0.9, z01, 1.0 },
+      { 1, 0, 0, 1 }
+   },
+
+   /* right quad : counter-clock-wise, back-facing, green */
+   {
+      { 0.2,  -0.9, z1, 1.0 },
+      { 0, 0, 1, -1 }
+   },
+
+   {
+      { -0.2,  0.8, z1, 1.0 },
+      { 0, 0, 1, -1 }
+   },
+
+   {
+      { 0.9,  0.8, z1, 1.0 },
+      { 0, 0, 1, -1 }
+   },
+
+   {
+      { 0.8, -0.9, z1, 1.0 },
+      { 0, 0, 1, -1 }
+   },
+};
+
+#define NUM_VERTS (sizeof(vertices) / sizeof(vertices[0]))
+
+
+
+static void
+set_vertices(void)
+{
+   struct pipe_vertex_element ve[2];
+   struct pipe_vertex_buffer vbuf;
+   void *handle;
+
+   memset(ve, 0, sizeof ve);
+
+   ve[0].src_offset = Offset(struct vertex, position);
+   ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
+   ve[1].src_offset = Offset(struct vertex, color);
+   ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
+
+   handle = info.ctx->create_vertex_elements_state(info.ctx, 2, ve);
+   info.ctx->bind_vertex_elements_state(info.ctx, handle);
+
+
+   vbuf.stride = sizeof(struct vertex);
+   vbuf.buffer_offset = 0;
+   vbuf.buffer = info.screen->user_buffer_create(info.screen,
+                                                 vertices,
+                                                 sizeof(vertices),
+                                                 PIPE_BIND_VERTEX_BUFFER);
+
+   info.ctx->set_vertex_buffers(info.ctx, 1, &vbuf);
+}
+
+
+static void
+set_vertex_shader(void)
+{
+   void *handle;
+   const char *text =
+      "VERT\n"
+      "DCL IN[0]\n"
+      "DCL IN[1]\n"
+      "DCL OUT[0], POSITION\n"
+      "DCL OUT[1], GENERIC[0]\n"
+      "  0: MOV OUT[0], IN[0]\n"
+      "  1: MOV OUT[1], IN[1]\n"
+      "  2: END\n";
+
+   handle = graw_parse_vertex_shader(info.ctx, text);
+   info.ctx->bind_vs_state(info.ctx, handle);
+}
+
+
+static void
+set_fragment_shader(void)
+{
+   void *handle;
+   const char *text =
+      "FRAG\n"
+      "DCL IN[0], GENERIC, CONSTANT\n"
+      "DCL OUT[0], COLOR\n"
+      "DCL OUT[1], POSITION\n"
+      "DCL TEMP[0]\n"
+      "IMM FLT32 {    1.0,     0.0,     0.0,     0.0 }\n"
+      "IMM FLT32 {    0.0,     1.0,     0.0,     0.0 }\n"
+      "IMM FLT32 {    0.5,     0.4,     0.0,     0.0 }\n"
+      " 0: MOV OUT[0], IN[0]\n"    /* front-facing: red */
+      " 1: IF IN[0].xxxx :3\n"
+      " 2:   MOV OUT[1].z, IMM[2].yyyy\n"   /* red: Z = 0.4 */
+      " 3: ELSE :5\n"
+      " 4:   MOV OUT[1].z, IMM[2].xxxx\n"   /* blue: Z = 0.5 */
+      " 5: ENDIF\n"
+      " 6: END\n";
+
+   handle = graw_parse_fragment_shader(info.ctx, text);
+   info.ctx->bind_fs_state(info.ctx, handle);
+}
+
+
+
+static void
+draw(void)
+{
+   union pipe_color_union clear_color;
+
+   clear_color.f[0] = 0.25;
+   clear_color.f[1] = 0.25;
+   clear_color.f[2] = 0.25;
+   clear_color.f[3] = 1.00;
+
+   info.ctx->clear(info.ctx,
+              PIPE_CLEAR_COLOR | PIPE_CLEAR_DEPTHSTENCIL,
+              &clear_color, 1.0, 0);
+   util_draw_arrays(info.ctx, PIPE_PRIM_QUADS, 0, NUM_VERTS);
+   info.ctx->flush(info.ctx, NULL);
+
+#if 0
+   /* At the moment, libgraw leaks out/makes available some of the
+    * symbols from gallium/auxiliary, including these debug helpers.
+    * Will eventually want to bless some of these paths, and lock the
+    * others down so they aren't accessible from test programs.
+    *
+    * This currently just happens to work on debug builds - a release
+    * build will probably fail to link here:
+    */
+   debug_dump_surface_bmp(info.ctx, "result.bmp", surf);
+#endif
+
+   graw_util_flush_front(&info);
+}
+
+
+#if 0
+static void
+resize(int w, int h)
+{
+   width = w;
+   height = h;
+
+   graw_util_viewport(&info, 0, 0, width, height, -1.0, 1.0);
+}
+#endif
+
+
+static void
+init(void)
+{
+   if (!graw_util_create_window(&info, width, height, 1, TRUE))
+      exit(1);
+
+   graw_util_default_state(&info, TRUE);
+
+   graw_util_viewport(&info, 0, 0, width, height, -1.0, 1.0);
+
+   set_vertices();
+   set_vertex_shader();
+   set_fragment_shader();
+}
+
+
+int
+main(int argc, char *argv[])
+{
+   init();
+
+   printf("The red quad should be entirely in front of the blue quad.\n");
+
+   graw_set_display_func(draw);
+   /*graw_set_reshape_func(resize);*/
+   graw_main_loop();
+   return 0;
+}