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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 <stdio.h>
#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_DEFAULT,
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;
}
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