173 lines
3.9 KiB
C
173 lines
3.9 KiB
C
/* Display a cleared blue window. This demo has no dependencies on
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* any utility code, just the graw interface and gallium.
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*/
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#include <stdio.h>
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#include "graw_util.h"
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static struct graw_info info;
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static const int WIDTH = 300;
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static const int HEIGHT = 300;
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struct vertex {
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float position[4];
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float color[4];
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};
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static boolean FlatShade = FALSE;
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static struct vertex vertices[3] =
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{
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{
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{ 0.0f, -0.9f, 0.0f, 1.0f },
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{ 1.0f, 0.0f, 0.0f, 1.0f }
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},
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{
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{ -0.9f, 0.9f, 0.0f, 1.0f },
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{ 0.0f, 1.0f, 0.0f, 1.0f }
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},
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{
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{ 0.9f, 0.9f, 0.0f, 1.0f },
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{ 0.0f, 0.0f, 1.0f, 1.0f }
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}
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};
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static void set_vertices( void )
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{
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struct pipe_vertex_element ve[2];
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struct pipe_vertex_buffer vbuf;
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void *handle;
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memset(ve, 0, sizeof ve);
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ve[0].src_offset = Offset(struct vertex, position);
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ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
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ve[1].src_offset = Offset(struct vertex, color);
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ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
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handle = info.ctx->create_vertex_elements_state(info.ctx, 2, ve);
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info.ctx->bind_vertex_elements_state(info.ctx, handle);
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memset(&vbuf, 0, sizeof vbuf);
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vbuf.stride = sizeof( struct vertex );
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vbuf.buffer_offset = 0;
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vbuf.buffer.resource = pipe_buffer_create_with_data(info.ctx,
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PIPE_BIND_VERTEX_BUFFER,
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PIPE_USAGE_DEFAULT,
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sizeof(vertices),
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vertices);
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info.ctx->set_vertex_buffers(info.ctx, 0, 1, 0, false, &vbuf);
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}
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static void set_vertex_shader( void )
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{
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void *handle;
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const char *text =
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"VERT\n"
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"DCL IN[0]\n"
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"DCL IN[1]\n"
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"DCL OUT[0], POSITION\n"
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"DCL OUT[1], COLOR\n"
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" 0: MOV OUT[1], IN[1]\n"
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" 1: MOV OUT[0], IN[0]\n"
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" 2: END\n";
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handle = graw_parse_vertex_shader(info.ctx, text);
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info.ctx->bind_vs_state(info.ctx, handle);
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}
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static void set_fragment_shader( void )
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{
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void *handle;
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const char *text =
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"FRAG\n"
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"DCL IN[0], COLOR, LINEAR\n"
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"DCL OUT[0], COLOR\n"
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" 0: MOV OUT[0], IN[0]\n"
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" 1: END\n";
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handle = graw_parse_fragment_shader(info.ctx, text);
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info.ctx->bind_fs_state(info.ctx, handle);
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}
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static void draw( void )
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{
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union pipe_color_union clear_color = { {1,0,1,1} };
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info.ctx->clear(info.ctx, PIPE_CLEAR_COLOR, NULL, &clear_color, 0, 0);
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util_draw_arrays(info.ctx, PIPE_PRIM_TRIANGLES, 0, 3);
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info.ctx->flush(info.ctx, NULL, 0);
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graw_save_surface_to_file(info.ctx, info.color_surf[0], NULL);
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graw_util_flush_front(&info);
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}
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static void init( void )
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{
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if (!graw_util_create_window(&info, WIDTH, HEIGHT, 1, FALSE))
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exit(1);
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graw_util_default_state(&info, FALSE);
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{
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struct pipe_rasterizer_state rasterizer;
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void *handle;
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memset(&rasterizer, 0, sizeof rasterizer);
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rasterizer.cull_face = PIPE_FACE_NONE;
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rasterizer.half_pixel_center = 1;
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rasterizer.bottom_edge_rule = 1;
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rasterizer.flatshade = FlatShade;
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rasterizer.depth_clip_near = 1;
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rasterizer.depth_clip_far = 1;
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handle = info.ctx->create_rasterizer_state(info.ctx, &rasterizer);
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info.ctx->bind_rasterizer_state(info.ctx, handle);
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}
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graw_util_viewport(&info, 0, 0, WIDTH, HEIGHT, 30, 1000);
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set_vertices();
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set_vertex_shader();
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set_fragment_shader();
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}
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static void args(int argc, char *argv[])
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{
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int i;
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for (i = 1; i < argc; ) {
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if (graw_parse_args(&i, argc, argv)) {
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/* ok */
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}
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else if (strcmp(argv[i], "-f") == 0) {
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FlatShade = TRUE;
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i++;
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}
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else {
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printf("Invalid arg %s\n", argv[i]);
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exit(1);
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}
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}
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}
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int main( int argc, char *argv[] )
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{
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args(argc, argv);
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init();
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graw_set_display_func( draw );
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graw_main_loop();
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return 0;
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}
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