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/* Display a cleared blue window.  This demo has no dependencies on

 * any utility code, just the graw interface and gallium.

 */

#include 

#include "graw_util.h"

static struct graw_info info;

static const int WIDTH = 300;

static const int HEIGHT = 300;

struct vertex {

   float position[4];

   float color[4];

};

static boolean FlatShade = FALSE;

static struct vertex vertices[3] =

{

   {

      { 0.0f, -0.9f, 0.0f, 1.0f },

      { 1.0f, 0.0f, 0.0f, 1.0f }

   },

   {

      { -0.9f, 0.9f, 0.0f, 1.0f },

      { 0.0f, 1.0f, 0.0f, 1.0f }

   },

   {

      { 0.9f, 0.9f, 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;

}