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/* Test the TGSI_SEMANTIC_FACE fragment shader input.
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#include "util/macros.h"
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static int width = 300;
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static int height = 300;
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static struct graw_info info;
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static struct vertex vertices[] =
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/* left quad: clock-wise, front-facing, red */
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{-0.8, -0.9, z0, 1.0 },
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{ -0.2, -0.9, z0, 1.0 },
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{ 0.2, 0.9, z01, 1.0 },
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{-0.9, 0.9, z01, 1.0 },
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/* right quad : counter-clock-wise, back-facing, green */
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{ 0.2, -0.9, z1, 1.0 },
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{ -0.2, 0.8, z1, 1.0 },
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{ 0.9, 0.8, z1, 1.0 },
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{ 0.8, -0.9, z1, 1.0 },
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#define NUM_VERTS ARRAY_SIZE(vertices)
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struct pipe_vertex_element ve[2];
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struct pipe_vertex_buffer vbuf;
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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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info.ctx->set_vertex_buffers(info.ctx, 0, 1, 0, false, &vbuf);
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set_vertex_shader(void)
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"DCL OUT[0], POSITION\n"
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"DCL OUT[1], GENERIC[0]\n"
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" 0: MOV OUT[0], IN[0]\n"
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" 1: MOV OUT[1], IN[1]\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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set_fragment_shader(void)
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"DCL IN[0], FACE, CONSTANT\n"
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"DCL IN[1], GENERIC, CONSTANT\n"
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"DCL OUT[0], COLOR\n"
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"IMM FLT32 { 1.0, 0.0, 0.0, 0.0 }\n"
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"IMM FLT32 { 0.0, 1.0, 0.0, 0.0 }\n"
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"IMM FLT32 { 0.5, 0.6, 0.0, 0.0 }\n"
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" 0: SGT TEMP[0].x, IN[0].xxxx, IMM[1].xxxx\n" /* TMP[0].x = IN[0].x > 0.0 */
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" 1: IF TEMP[0].xxxx :4\n"
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" 2: MOV OUT[0], IMM[0]\n" /* front-facing: red */
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" 4: MOV OUT[0], IMM[1]\n" /* back-facing: green */
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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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union pipe_color_union clear_color;
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clear_color.f[0] = 0.25;
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clear_color.f[1] = 0.25;
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clear_color.f[2] = 0.25;
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clear_color.f[3] = 1.00;
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info.ctx->clear(info.ctx,
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PIPE_CLEAR_COLOR | PIPE_CLEAR_DEPTHSTENCIL,
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&clear_color, 1.0, 0);
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util_draw_arrays(info.ctx, PIPE_PRIM_QUADS, 0, NUM_VERTS);
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info.ctx->flush(info.ctx, NULL, 0);
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graw_util_flush_front(&info);
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set_viewport(0, 0, width, height, 30, 1000);
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if (!graw_util_create_window(&info, width, height, 1, TRUE))
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graw_util_default_state(&info, TRUE);
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graw_util_viewport(&info, 0, 0, width, height, -1.0, 1.0);
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set_fragment_shader();
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main(int argc, char *argv[])
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printf("Left quad: clock-wise, front-facing, red\n");
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printf("Right quad: counter clock-wise, back-facing, green\n");
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graw_set_display_func(draw);
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/*graw_set_reshape_func(resize);*/