Subversion Repositories Kolibri OS

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

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

 */

#include 

#include "state_tracker/graw.h"

#include "pipe/p_screen.h"

#include "pipe/p_context.h"

#include "pipe/p_state.h"

#include "pipe/p_defines.h"

#include "util/u_memory.h"      /* Offset() */

#include "util/u_draw_quad.h"

#include "util/u_inlines.h"

enum pipe_format formats[] = {

   PIPE_FORMAT_RGBA8888_UNORM,

   PIPE_FORMAT_BGRA8888_UNORM,

   PIPE_FORMAT_NONE

};

static const int WIDTH = 300;

static const int HEIGHT = 300;

static struct pipe_screen *screen = NULL;

static struct pipe_context *ctx = NULL;

static struct pipe_surface *surf = NULL;

static struct pipe_resource *tex = NULL;

static void *window = NULL;

struct vertex {

   float position[4];

   float color[4];

};

static struct vertex vertices[4] =

{

   { { 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_viewport( float x, float y,

                          float width, float height,

                          float zNear, float zFar)

{

   float z = zFar;

   float half_width = (float)width / 2.0f;

   float half_height = (float)height / 2.0f;

   float half_depth = ((float)zFar - (float)zNear) / 2.0f;

   struct pipe_viewport_state vp;

   vp.scale[0] = half_width;

   vp.scale[1] = half_height;

   vp.scale[2] = half_depth;

   vp.translate[0] = half_width + x;

   vp.translate[1] = half_height + y;

   vp.translate[2] = half_depth + z;

   ctx->set_viewport_states( ctx, 0, 1, &vp );

}

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 = ctx->create_vertex_elements_state(ctx, 2, ve);

   ctx->bind_vertex_elements_state(ctx, handle);

   memset(&vbuf, 0, sizeof vbuf);

   vbuf.stride = sizeof( struct vertex );

   vbuf.buffer_offset = 0;

   vbuf.buffer = pipe_buffer_create_with_data(ctx,

                                              PIPE_BIND_VERTEX_BUFFER,

                                              PIPE_USAGE_DEFAULT,

                                              sizeof(vertices),

                                              vertices);

   ctx->set_vertex_buffers(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(ctx, text);

   ctx->bind_vs_state(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(ctx, text);

   ctx->bind_fs_state(ctx, handle);

}

static void set_geometry_shader( void )

{

   void *handle;

   const char *text =

      "GEOM\n"

      "PROPERTY GS_INPUT_PRIMITIVE TRIANGLES\n"

      "PROPERTY GS_OUTPUT_PRIMITIVE TRIANGLE_STRIP\n"

      "DCL IN[][0], POSITION, CONSTANT\n"

      "DCL IN[][1], COLOR, CONSTANT\n"

      "DCL OUT[0], POSITION, CONSTANT\n"

      "DCL OUT[1], COLOR, CONSTANT\n"

      "0:MOV OUT[0], IN[0][0]\n"

      "1:MOV OUT[1], IN[0][1]\n"

      "2:EMIT\n"

      "3:MOV OUT[0], IN[1][0]\n"

      "4:MOV OUT[1], IN[0][1]\n" /* copy color from input vertex 0 */

      "5:EMIT\n"

      "6:MOV OUT[0], IN[2][0]\n"

      "7:MOV OUT[1], IN[2][1]\n"

      "8:EMIT\n"

      "9:ENDPRIM\n"

      "10:END\n";

   handle = graw_parse_geometry_shader(ctx, text);

   ctx->bind_gs_state(ctx, handle);

}

static void draw( void )

{

   union pipe_color_union clear_color = { {1,0,1,1} };

   ctx->clear(ctx, PIPE_CLEAR_COLOR, &clear_color, 0, 0);

   util_draw_arrays(ctx, PIPE_PRIM_TRIANGLES, 0, 3);

   ctx->flush(ctx, NULL, 0);

   screen->flush_frontbuffer(screen, tex, 0, 0, window, NULL);

}

static void init( void )

{

   struct pipe_framebuffer_state fb;

   struct pipe_resource templat;

   struct pipe_surface surf_tmpl;

   int i;

   /* It's hard to say whether window or screen should be created

    * first.  Different environments would prefer one or the other.

    *

    * Also, no easy way of querying supported formats if the screen

    * cannot be created first.

    */

   for (i = 0; formats[i] != PIPE_FORMAT_NONE; i++) {

      screen = graw_create_window_and_screen(0, 0, 300, 300,

                                             formats[i],

                                             &window);

      if (window && screen)

         break;

   }

   if (!screen || !window) {

      fprintf(stderr, "Unable to create window\n");

      exit(1);

   }

   ctx = screen->context_create(screen, NULL);

   if (ctx == NULL)

      exit(3);

   templat.target = PIPE_TEXTURE_2D;

   templat.format = formats[i];

   templat.width0 = WIDTH;

   templat.height0 = HEIGHT;

   templat.depth0 = 1;

   templat.array_size = 1;

   templat.last_level = 0;

   templat.nr_samples = 1;

   templat.bind = (PIPE_BIND_RENDER_TARGET |

                   PIPE_BIND_DISPLAY_TARGET);

   tex = screen->resource_create(screen,

                                 &templat);

   if (tex == NULL)

      exit(4);

   surf_tmpl.format = templat.format;

   surf_tmpl.u.tex.level = 0;

   surf_tmpl.u.tex.first_layer = 0;

   surf_tmpl.u.tex.last_layer = 0;

   surf = ctx->create_surface(ctx, tex, &surf_tmpl);

   if (surf == NULL)

      exit(5);

   memset(&fb, 0, sizeof fb);

   fb.nr_cbufs = 1;

   fb.width = WIDTH;

   fb.height = HEIGHT;

   fb.cbufs[0] = surf;

   ctx->set_framebuffer_state(ctx, &fb);

   {

      struct pipe_blend_state blend;

      void *handle;

      memset(&blend, 0, sizeof blend);

      blend.rt[0].colormask = PIPE_MASK_RGBA;

      handle = ctx->create_blend_state(ctx, &blend);

      ctx->bind_blend_state(ctx, handle);

   }

   {

      struct pipe_depth_stencil_alpha_state depthstencil;

      void *handle;

      memset(&depthstencil, 0, sizeof depthstencil);

      handle = ctx->create_depth_stencil_alpha_state(ctx, &depthstencil);

      ctx->bind_depth_stencil_alpha_state(ctx, handle);

   }

   {

      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.depth_clip = 1;

      handle = ctx->create_rasterizer_state(ctx, &rasterizer);

      ctx->bind_rasterizer_state(ctx, handle);

   }

   set_viewport(0, 0, WIDTH, HEIGHT, 30, 1000);

   set_vertices();

   set_vertex_shader();

   set_fragment_shader();

   set_geometry_shader();

}

int main( int argc, char *argv[] )

{

   init();

   graw_set_display_func( draw );

   graw_main_loop();

   return 0;

}