tests/graw: Add a bunch of tests.

These were rotting in an internal branch, but contain nothing confidential,
and would be much more useful if kept up-to-date with latest gallium
interface changes.

Several authors including Keith Whitwell, Zack Rusin, and Brian Paul.

1 files changed, 259 insertions, 0 deletions

diff --git a/src/gallium/tests/graw/fs-fragcoord.c b/src/gallium/tests/graw/fs-fragcoord.c
new file mode 100644
index 00000000000..471acbb3639
--- /dev/null
+++ b/src/gallium/tests/graw/fs-fragcoord.c
@@ -0,0 +1,259 @@
+/* Test the TGSI_SEMANTIC_POSITION fragment shader input.
+ * Plus properties for upper-left vs. lower-left origin and
+ * center integer vs. half-integer;
+ */
+
+#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];
+};
+
+/* Note: the upper-left vertex is pushed to the left a bit to
+ * make sure we can spot upside-down rendering.
+ */
+static struct vertex vertices[] =
+{
+   {
+      {-0.95, -0.95, 0.5, 1.0 },
+      { 0, 0, 0, 1 }
+   },
+
+   {
+      { 0.85, -0.95, 0.5, 1.0 },
+      { 0, 0, 0, 1 }
+   },
+
+   {
+      { 0.95,  0.95, 0.5, 1.0 },
+      { 0, 0, 0, 1 }
+   },
+
+   {
+      {-0.95,  0.95, 0.5, 1.0 },
+      { 0, 0, 0, 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(int mode)
+{
+   void *handle;
+
+   const char *origin_upper_left_text =
+      "FRAG\n"
+      "PROPERTY FS_COORD_ORIGIN UPPER_LEFT\n"  /* upper-left = black corner */
+      "DCL IN[0], POSITION, LINEAR\n"
+      "DCL OUT[0], COLOR\n"
+      "DCL TEMP[0]\n"
+      "IMM FLT32 { 0.003333, 0.003333, 1.0, 1.0 }\n"
+      "IMM FLT32 { 0.0, 300.0, 0.0, 0.0 }\n"
+      " 0: MOV TEMP[0], IN[0] \n"
+      " 1: MOV TEMP[0].zw, IMM[1].xxxx \n"
+      " 2: MUL OUT[0], TEMP[0], IMM[0] \n"
+      " 3: END\n";
+
+   const char *origin_lower_left_text =
+      "FRAG\n"
+      "PROPERTY FS_COORD_ORIGIN LOWER_LEFT\n"  /* lower-left = black corner */
+      "DCL IN[0], POSITION, LINEAR\n"
+      "DCL OUT[0], COLOR\n"
+      "DCL TEMP[0]\n"
+      "IMM FLT32 { 0.003333, 0.003333, 1.0, 1.0 }\n"
+      "IMM FLT32 { 0.0, 300.0, 0.0, 0.0 }\n"
+      " 0: MOV TEMP[0], IN[0] \n"
+      " 1: MOV TEMP[0].zw, IMM[1].xxxx \n"
+      " 2: MUL OUT[0], TEMP[0], IMM[0] \n"
+      " 3: END\n";
+
+   /* Test fragcoord center integer vs. half integer */
+   const char *center_integer_text =
+      "FRAG\n"
+      "PROPERTY FS_COORD_PIXEL_CENTER INTEGER \n"       /* pixels are black */
+      "DCL IN[0], POSITION, LINEAR \n"
+      "DCL OUT[0], COLOR \n"
+      "DCL TEMP[0] \n"
+      "IMM FLT32 { 0.003333, 0.003333, 1.0, 1.0 } \n"
+      "IMM FLT32 { 0.0, 300.0, 0.0, 0.0 } \n"
+      "0: FRC TEMP[0], IN[0]  \n"
+      "1: MOV TEMP[0].zw, IMM[1].xxxx \n"
+      "2: MOV OUT[0], TEMP[0] \n"
+      "3: END \n";
+
+   const char *center_half_integer_text =
+      "FRAG\n"
+      "PROPERTY FS_COORD_PIXEL_CENTER HALF_INTEGER \n"  /* pixels are olive colored */
+      "DCL IN[0], POSITION, LINEAR \n"
+      "DCL OUT[0], COLOR \n"
+      "DCL TEMP[0] \n"
+      "IMM FLT32 { 0.003333, 0.003333, 1.0, 1.0 } \n"
+      "IMM FLT32 { 0.0, 300.0, 0.0, 0.0 } \n"
+      "0: FRC TEMP[0], IN[0]  \n"
+      "1: MOV TEMP[0].zw, IMM[1].xxxx \n"
+      "2: MOV OUT[0], TEMP[0] \n"
+      "3: END \n";
+
+   const char *text;
+
+   if (mode == 0)
+      text = origin_upper_left_text;
+   else if (mode == 1)
+      text = origin_lower_left_text;
+   else if (mode == 2)
+      text = center_integer_text;
+   else
+      text = center_half_integer_text;
+
+   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] = 1.0;
+
+   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;
+
+   set_viewport(0, 0, width, height, 30, 1000);
+}
+#endif
+
+
+static void
+init(int mode)
+{
+   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(mode);
+}
+
+
+int
+main(int argc, char *argv[])
+{
+   int mode = argc > 1 ? atoi(argv[1]) : 0;
+
+   switch (mode) {
+   default:
+   case 0:
+      printf("frag coord origin upper-left (lower-left = black)\n");
+      break;
+   case 1:
+      printf("frag coord origin lower-left (upper-left = black)\n");
+      break;
+   case 2:
+      printf("frag coord center integer (all pixels black)\n");
+      break;
+   case 3:
+      printf("frag coord center half-integer (all pixels olive color)\n");
+      break;
+   }
+
+   init(mode);
+
+   graw_set_display_func(draw);
+   /*graw_set_reshape_func(resize);*/
+   graw_main_loop();
+   return 0;
+}