1 /* Test the TGSI_SEMANTIC_FACE fragment shader input. 2 */ 3 4 #include <stdio.h> 5 6 #include "graw_util.h" 7 8 9 static int width = 300; 10 static int height = 300; 11 12 static struct graw_info info; 13 14 struct vertex { 15 float position[4]; 16 float color[4]; 17 }; 18 19 #define z0 0.2 20 #define z01 0.5 21 #define z1 0.4 22 23 static struct vertex vertices[] = 24 { 25 /* left quad: clock-wise, front-facing, red */ 26 { 27 {-0.8, -0.9, z0, 1.0 }, 28 { 0, 0, 0, 1 } 29 }, 30 31 { 32 { -0.2, -0.9, z0, 1.0 }, 33 { 0, 0, 0, 1 } 34 }, 35 36 { 37 { 0.2, 0.9, z01, 1.0 }, 38 { 0, 0, 0, 1 } 39 }, 40 41 { 42 {-0.9, 0.9, z01, 1.0 }, 43 { 0, 0, 0, 1 } 44 }, 45 46 /* right quad : counter-clock-wise, back-facing, green */ 47 { 48 { 0.2, -0.9, z1, 1.0 }, 49 { 1, 1, 1, -1 } 50 }, 51 52 { 53 { -0.2, 0.8, z1, 1.0 }, 54 { 1, 1, 1, -1 } 55 }, 56 57 { 58 { 0.9, 0.8, z1, 1.0 }, 59 { 1, 1, 1, -1 } 60 }, 61 62 { 63 { 0.8, -0.9, z1, 1.0 }, 64 { 1, 1, 1, -1 } 65 }, 66 }; 67 68 #define NUM_VERTS (sizeof(vertices) / sizeof(vertices[0])) 69 70 71 72 static void 73 set_vertices(void) 74 { 75 struct pipe_vertex_element ve[2]; 76 struct pipe_vertex_buffer vbuf; 77 void *handle; 78 79 memset(ve, 0, sizeof ve); 80 81 ve[0].src_offset = Offset(struct vertex, position); 82 ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT; 83 ve[1].src_offset = Offset(struct vertex, color); 84 ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT; 85 86 handle = info.ctx->create_vertex_elements_state(info.ctx, 2, ve); 87 info.ctx->bind_vertex_elements_state(info.ctx, handle); 88 89 90 vbuf.stride = sizeof(struct vertex); 91 vbuf.buffer_offset = 0; 92 vbuf.buffer = pipe_buffer_create_with_data(info.ctx, 93 PIPE_BIND_VERTEX_BUFFER, 94 PIPE_USAGE_STATIC, 95 sizeof(vertices), 96 vertices); 97 98 info.ctx->set_vertex_buffers(info.ctx, 1, &vbuf); 99 } 100 101 102 static void 103 set_vertex_shader(void) 104 { 105 void *handle; 106 const char *text = 107 "VERT\n" 108 "DCL IN[0]\n" 109 "DCL IN[1]\n" 110 "DCL OUT[0], POSITION\n" 111 "DCL OUT[1], GENERIC[0]\n" 112 " 0: MOV OUT[0], IN[0]\n" 113 " 1: MOV OUT[1], IN[1]\n" 114 " 2: END\n"; 115 116 handle = graw_parse_vertex_shader(info.ctx, text); 117 info.ctx->bind_vs_state(info.ctx, handle); 118 } 119 120 121 static void 122 set_fragment_shader(void) 123 { 124 void *handle; 125 const char *text = 126 "FRAG\n" 127 "DCL IN[0], FACE, CONSTANT\n" 128 "DCL IN[1], GENERIC, CONSTANT\n" 129 "DCL OUT[0], COLOR\n" 130 "DCL TEMP[0]\n" 131 "IMM FLT32 { 1.0, 0.0, 0.0, 0.0 }\n" 132 "IMM FLT32 { 0.0, 1.0, 0.0, 0.0 }\n" 133 "IMM FLT32 { 0.5, 0.6, 0.0, 0.0 }\n" 134 " 0: SGT TEMP[0].x, IN[0].xxxx, IMM[1].xxxx\n" /* TMP[0].x = IN[0].x > 0.0 */ 135 " 1: IF TEMP[0].xxxx :4\n" 136 " 2: MOV OUT[0], IMM[0]\n" /* front-facing: red */ 137 " 3: ELSE :5\n" 138 " 4: MOV OUT[0], IMM[1]\n" /* back-facing: green */ 139 " 5: ENDIF\n" 140 " 6: END\n"; 141 142 handle = graw_parse_fragment_shader(info.ctx, text); 143 info.ctx->bind_fs_state(info.ctx, handle); 144 } 145 146 147 static void 148 draw(void) 149 { 150 union pipe_color_union clear_color; 151 152 clear_color.f[0] = 0.25; 153 clear_color.f[1] = 0.25; 154 clear_color.f[2] = 0.25; 155 clear_color.f[3] = 1.00; 156 157 info.ctx->clear(info.ctx, 158 PIPE_CLEAR_COLOR | PIPE_CLEAR_DEPTHSTENCIL, 159 &clear_color, 1.0, 0); 160 util_draw_arrays(info.ctx, PIPE_PRIM_QUADS, 0, NUM_VERTS); 161 info.ctx->flush(info.ctx, NULL); 162 163 graw_util_flush_front(&info); 164 } 165 166 167 #if 0 168 static void 169 resize(int w, int h) 170 { 171 width = w; 172 height = h; 173 174 set_viewport(0, 0, width, height, 30, 1000); 175 } 176 #endif 177 178 179 static void 180 init(void) 181 { 182 if (!graw_util_create_window(&info, width, height, 1, TRUE)) 183 exit(1); 184 185 graw_util_default_state(&info, TRUE); 186 187 graw_util_viewport(&info, 0, 0, width, height, -1.0, 1.0); 188 189 set_vertices(); 190 set_vertex_shader(); 191 set_fragment_shader(); 192 } 193 194 195 int 196 main(int argc, char *argv[]) 197 { 198 init(); 199 200 printf("Left quad: clock-wise, front-facing, red\n"); 201 printf("Right quad: counter clock-wise, back-facing, green\n"); 202 203 graw_set_display_func(draw); 204 /*graw_set_reshape_func(resize);*/ 205 graw_main_loop(); 206 return 0; 207 } 208