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

[Jose Fonseca]

Looks good.

A future improvement could be querying PIPE_CAP_MAX_TEXTURE_2D_LEVELS instead of using a constant width/height.

Jose


----- Original Message -----
> 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
>