1 /* Test the writing Z in fragment shader. 2 * The red quad should be entirely in front of the blue quad even 3 * though the overlap and intersect in Z. 4 */ 5 6 #include <stdio.h> 7 8 #include "graw_util.h" 9 10 11 static int width = 300; 12 static int height = 300; 13 14 static struct graw_info info; 15 16 17 struct vertex { 18 float position[4]; 19 float color[4]; 20 }; 21 22 #define z0 0.2 23 #define z01 0.5 24 #define z1 0.4 25 26 27 static struct vertex vertices[] = 28 { 29 /* left quad: clock-wise, front-facing, red */ 30 { 31 {-0.8, -0.9, z0, 1.0 }, 32 { 1, 0, 0, 1 } 33 }, 34 35 { 36 { -0.2, -0.9, z0, 1.0 }, 37 { 1, 0, 0, 1 } 38 }, 39 40 { 41 { 0.2, 0.9, z01, 1.0 }, 42 { 1, 0, 0, 1 } 43 }, 44 45 { 46 {-0.9, 0.9, z01, 1.0 }, 47 { 1, 0, 0, 1 } 48 }, 49 50 /* right quad : counter-clock-wise, back-facing, green */ 51 { 52 { 0.2, -0.9, z1, 1.0 }, 53 { 0, 0, 1, -1 } 54 }, 55 56 { 57 { -0.2, 0.8, z1, 1.0 }, 58 { 0, 0, 1, -1 } 59 }, 60 61 { 62 { 0.9, 0.8, z1, 1.0 }, 63 { 0, 0, 1, -1 } 64 }, 65 66 { 67 { 0.8, -0.9, z1, 1.0 }, 68 { 0, 0, 1, -1 } 69 }, 70 }; 71 72 #define NUM_VERTS (sizeof(vertices) / sizeof(vertices[0])) 73 74 75 76 static void 77 set_vertices(void) 78 { 79 struct pipe_vertex_element ve[2]; 80 struct pipe_vertex_buffer vbuf; 81 void *handle; 82 83 memset(ve, 0, sizeof ve); 84 85 ve[0].src_offset = Offset(struct vertex, position); 86 ve[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT; 87 ve[1].src_offset = Offset(struct vertex, color); 88 ve[1].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT; 89 90 handle = info.ctx->create_vertex_elements_state(info.ctx, 2, ve); 91 info.ctx->bind_vertex_elements_state(info.ctx, handle); 92 93 memset(&vbuf, 0, sizeof vbuf); 94 95 vbuf.stride = sizeof(struct vertex); 96 vbuf.buffer_offset = 0; 97 vbuf.buffer = pipe_buffer_create_with_data(info.ctx, 98 PIPE_BIND_VERTEX_BUFFER, 99 PIPE_USAGE_DEFAULT, 100 sizeof(vertices), 101 vertices); 102 103 info.ctx->set_vertex_buffers(info.ctx, 0, 1, &vbuf); 104 } 105 106 107 static void 108 set_vertex_shader(void) 109 { 110 void *handle; 111 const char *text = 112 "VERT\n" 113 "DCL IN[0]\n" 114 "DCL IN[1]\n" 115 "DCL OUT[0], POSITION\n" 116 "DCL OUT[1], GENERIC[0]\n" 117 " 0: MOV OUT[0], IN[0]\n" 118 " 1: MOV OUT[1], IN[1]\n" 119 " 2: END\n"; 120 121 handle = graw_parse_vertex_shader(info.ctx, text); 122 info.ctx->bind_vs_state(info.ctx, handle); 123 } 124 125 126 static void 127 set_fragment_shader(void) 128 { 129 void *handle; 130 const char *text = 131 "FRAG\n" 132 "DCL IN[0], GENERIC, CONSTANT\n" 133 "DCL OUT[0], COLOR\n" 134 "DCL OUT[1], POSITION\n" 135 "DCL TEMP[0]\n" 136 "IMM FLT32 { 1.0, 0.0, 0.0, 0.0 }\n" 137 "IMM FLT32 { 0.0, 1.0, 0.0, 0.0 }\n" 138 "IMM FLT32 { 0.5, 0.4, 0.0, 0.0 }\n" 139 " 0: MOV OUT[0], IN[0]\n" /* front-facing: red */ 140 " 1: IF IN[0].xxxx :3\n" 141 " 2: MOV OUT[1].z, IMM[2].yyyy\n" /* red: Z = 0.4 */ 142 " 3: ELSE :5\n" 143 " 4: MOV OUT[1].z, IMM[2].xxxx\n" /* blue: Z = 0.5 */ 144 " 5: ENDIF\n" 145 " 6: END\n"; 146 147 handle = graw_parse_fragment_shader(info.ctx, text); 148 info.ctx->bind_fs_state(info.ctx, handle); 149 } 150 151 152 153 static void 154 draw(void) 155 { 156 union pipe_color_union clear_color; 157 158 clear_color.f[0] = 0.25; 159 clear_color.f[1] = 0.25; 160 clear_color.f[2] = 0.25; 161 clear_color.f[3] = 1.00; 162 163 info.ctx->clear(info.ctx, 164 PIPE_CLEAR_COLOR | PIPE_CLEAR_DEPTHSTENCIL, 165 &clear_color, 1.0, 0); 166 util_draw_arrays(info.ctx, PIPE_PRIM_QUADS, 0, NUM_VERTS); 167 info.ctx->flush(info.ctx, NULL, 0); 168 169 #if 0 170 /* At the moment, libgraw leaks out/makes available some of the 171 * symbols from gallium/auxiliary, including these debug helpers. 172 * Will eventually want to bless some of these paths, and lock the 173 * others down so they aren't accessible from test programs. 174 * 175 * This currently just happens to work on debug builds - a release 176 * build will probably fail to link here: 177 */ 178 debug_dump_surface_bmp(info.ctx, "result.bmp", surf); 179 #endif 180 181 graw_util_flush_front(&info); 182 } 183 184 185 #if 0 186 static void 187 resize(int w, int h) 188 { 189 width = w; 190 height = h; 191 192 graw_util_viewport(&info, 0, 0, width, height, -1.0, 1.0); 193 } 194 #endif 195 196 197 static void 198 init(void) 199 { 200 if (!graw_util_create_window(&info, width, height, 1, TRUE)) 201 exit(1); 202 203 graw_util_default_state(&info, TRUE); 204 205 graw_util_viewport(&info, 0, 0, width, height, -1.0, 1.0); 206 207 set_vertices(); 208 set_vertex_shader(); 209 set_fragment_shader(); 210 } 211 212 213 int 214 main(int argc, char *argv[]) 215 { 216 init(); 217 218 printf("The red quad should be entirely in front of the blue quad.\n"); 219 220 graw_set_display_func(draw); 221 /*graw_set_reshape_func(resize);*/ 222 graw_main_loop(); 223 return 0; 224 } 225
