[Mesa-dev] [PATCH] graw: add a test rendering a huge triangle

[Zack Rusin]

Used to test rasterization, because we often breakdown on
subdivision of triangles with long edges.

Signed-off-by: Zack Rusin <zackr at vmware.com>
---
 src/gallium/tests/graw/SConscript  |   1 +
 src/gallium/tests/graw/tri-large.c | 173 +++++++++++++++++++++++++++++++++++++
 2 files changed, 174 insertions(+)
 create mode 100644 src/gallium/tests/graw/tri-large.c

diff --git a/src/gallium/tests/graw/SConscript b/src/gallium/tests/graw/SConscript
index 8740ff3..8723807 100644
--- a/src/gallium/tests/graw/SConscript
+++ b/src/gallium/tests/graw/SConscript
@@ -29,6 +29,7 @@ progs = [
     'tex-srgb',
     'tex-swizzle',
     'tri',
+    'tri-large',
     'tri-gs',
     'tri-instanced',
     'vs-test',
diff --git a/src/gallium/tests/graw/tri-large.c b/src/gallium/tests/graw/tri-large.c
new file mode 100644
index 0000000..3fbbfb3
--- /dev/null
+++ b/src/gallium/tests/graw/tri-large.c
@@ -0,0 +1,173 @@
+/* Display a cleared blue window.  This demo has no dependencies on
+ * any utility code, just the graw interface and gallium.
+ */
+
+#include "graw_util.h"
+#include "util/u_debug.h"
+
+#include <stdio.h>
+
+static struct graw_info info;
+
+static const int WIDTH = 4*2048;
+static const int HEIGHT = 4*2048;
+
+
+struct vertex {
+   float position[4];
+   float color[4];
+};
+
+static boolean FlatShade = FALSE;
+
+
+static struct vertex vertices[3] =
+{
+   {
+      { -1.0f, -1.0f, 0.0f, 1.0f },
+      { 1.0f, 0.0f, 0.0f, 1.0f }
+   },
+   {
+      { -1.0f, 1.0f, 0.0f, 1.0f },
+      { 0.0f, 1.0f, 0.0f, 1.0f }
+   },
+   {
+      { 1.0f, 1.0f, 0.0f, 1.0f },
+      { 0.0f, 0.0f, 1.0f, 1.0f }
+   }
+};
+
+
+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);
+
+   memset(&vbuf, 0, sizeof vbuf);
+
+   vbuf.stride = sizeof( struct vertex );
+   vbuf.buffer_offset = 0;
+   vbuf.buffer = pipe_buffer_create_with_data(info.ctx,
+                                              PIPE_BIND_VERTEX_BUFFER,
+                                              PIPE_USAGE_STATIC,
+                                              sizeof(vertices),
+                                              vertices);
+
+   info.ctx->set_vertex_buffers(info.ctx, 0, 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], COLOR\n"
+      "  0: MOV OUT[1], IN[1]\n"
+      "  1: MOV OUT[0], IN[0]\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], COLOR, LINEAR\n"
+      "DCL OUT[0], COLOR\n"
+      "  0: MOV OUT[0], IN[0]\n"
+      "  1: 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 = { {1,0,1,1} };
+
+   info.ctx->clear(info.ctx, PIPE_CLEAR_COLOR, &clear_color, 0, 0);
+   util_draw_arrays(info.ctx, PIPE_PRIM_TRIANGLES, 0, 3);
+   info.ctx->flush(info.ctx, NULL, 0);
+
+   graw_save_surface_to_file(info.ctx, info.color_surf[0], NULL);
+
+   graw_util_flush_front(&info);
+}
+
+
+static void init( void )
+{
+   if (!graw_util_create_window(&info, WIDTH, HEIGHT, 1, FALSE))
+      exit(1);
+
+   graw_util_default_state(&info, FALSE);
+
+   {
+      struct pipe_rasterizer_state rasterizer;
+      void *handle;
+      memset(&rasterizer, 0, sizeof rasterizer);
+      rasterizer.cull_face = PIPE_FACE_NONE;
+      rasterizer.half_pixel_center = 1;
+      rasterizer.bottom_edge_rule = 1;
+      rasterizer.flatshade = FlatShade;
+      rasterizer.depth_clip = 1;
+      handle = info.ctx->create_rasterizer_state(info.ctx, &rasterizer);
+      info.ctx->bind_rasterizer_state(info.ctx, handle);
+   }
+
+
+   graw_util_viewport(&info, 0, 0, WIDTH, HEIGHT, 30, 1000);
+
+   set_vertices();
+   set_vertex_shader();
+   set_fragment_shader();
+}
+
+static void args(int argc, char *argv[])
+{
+   int i;
+
+   for (i = 1; i < argc; ) {
+      if (graw_parse_args(&i, argc, argv)) {
+         /* ok */
+      }
+      else if (strcmp(argv[i], "-f") == 0) {
+         FlatShade = TRUE;
+         i++;
+      }
+      else {
+         printf("Invalid arg %s\n", argv[i]);
+         exit(1);
+      }
+   }
+}
+
+int main( int argc, char *argv[] )
+{
+   args(argc, argv);
+   init();
+
+   graw_set_display_func( draw );
+   graw_main_loop();
+   return 0;
+}
-- 
1.8.3.2