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5564 | serge | 1 | /************************************************************************** |
2 | * |
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3 | * Copyright 2007 VMware, Inc. |
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4 | * All Rights Reserved. |
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5 | * |
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6 | * Permission is hereby granted, free of charge, to any person obtaining a |
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7 | * copy of this software and associated documentation files (the |
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8 | * "Software"), to deal in the Software without restriction, including |
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9 | * without limitation the rights to use, copy, modify, merge, publish, |
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10 | * distribute, sub license, and/or sell copies of the Software, and to |
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11 | * permit persons to whom the Software is furnished to do so, subject to |
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12 | * the following conditions: |
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13 | * |
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14 | * The above copyright notice and this permission notice (including the |
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15 | * next paragraph) shall be included in all copies or substantial portions |
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16 | * of the Software. |
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17 | * |
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18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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19 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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20 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. |
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21 | * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR |
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22 | * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
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23 | * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
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24 | * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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25 | * |
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26 | **************************************************************************/ |
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27 | |||
28 | /* Authors: Keith Whitwell |
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29 | */ |
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30 | |||
31 | #include "util/u_math.h" |
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32 | #include "util/u_memory.h" |
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33 | #include "pipe/p_defines.h" |
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34 | #include "pipe/p_shader_tokens.h" |
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35 | #include "draw_vs.h" |
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36 | #include "draw_pipe.h" |
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37 | |||
38 | struct twoside_stage { |
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39 | struct draw_stage stage; |
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40 | float sign; /**< +1 or -1 */ |
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41 | int attrib_front0, attrib_back0; |
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42 | int attrib_front1, attrib_back1; |
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43 | }; |
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44 | |||
45 | |||
46 | static INLINE struct twoside_stage *twoside_stage( struct draw_stage *stage ) |
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47 | { |
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48 | return (struct twoside_stage *)stage; |
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49 | } |
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50 | |||
51 | /** |
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52 | * Copy back color(s) to front color(s). |
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53 | */ |
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54 | static INLINE struct vertex_header * |
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55 | copy_bfc( struct twoside_stage *twoside, |
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56 | const struct vertex_header *v, |
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57 | unsigned idx ) |
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58 | { |
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59 | struct vertex_header *tmp = dup_vert( &twoside->stage, v, idx ); |
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60 | |||
61 | if (twoside->attrib_back0 >= 0 && twoside->attrib_front0 >= 0) { |
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62 | COPY_4FV(tmp->data[twoside->attrib_front0], |
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63 | tmp->data[twoside->attrib_back0]); |
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64 | } |
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65 | if (twoside->attrib_back1 >= 0 && twoside->attrib_front1 >= 0) { |
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66 | COPY_4FV(tmp->data[twoside->attrib_front1], |
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67 | tmp->data[twoside->attrib_back1]); |
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68 | } |
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69 | |||
70 | return tmp; |
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71 | } |
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72 | |||
73 | |||
74 | /* Twoside tri: |
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75 | */ |
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76 | static void twoside_tri( struct draw_stage *stage, |
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77 | struct prim_header *header ) |
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78 | { |
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79 | struct twoside_stage *twoside = twoside_stage(stage); |
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80 | |||
81 | if (header->det * twoside->sign < 0.0) { |
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82 | /* this is a back-facing triangle */ |
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83 | struct prim_header tmp; |
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84 | |||
85 | tmp.det = header->det; |
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86 | tmp.flags = header->flags; |
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87 | tmp.pad = header->pad; |
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88 | /* copy back attribs to front attribs */ |
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89 | tmp.v[0] = copy_bfc(twoside, header->v[0], 0); |
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90 | tmp.v[1] = copy_bfc(twoside, header->v[1], 1); |
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91 | tmp.v[2] = copy_bfc(twoside, header->v[2], 2); |
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92 | |||
93 | stage->next->tri( stage->next, &tmp ); |
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94 | } |
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95 | else { |
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96 | stage->next->tri( stage->next, header ); |
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97 | } |
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98 | } |
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99 | |||
100 | |||
101 | |||
102 | static void twoside_first_tri( struct draw_stage *stage, |
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103 | struct prim_header *header ) |
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104 | { |
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105 | struct twoside_stage *twoside = twoside_stage(stage); |
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106 | const struct draw_vertex_shader *vs = stage->draw->vs.vertex_shader; |
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107 | uint i; |
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108 | |||
109 | twoside->attrib_front0 = -1; |
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110 | twoside->attrib_front1 = -1; |
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111 | twoside->attrib_back0 = -1; |
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112 | twoside->attrib_back1 = -1; |
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113 | |||
114 | /* Find which vertex shader outputs are front/back colors */ |
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115 | for (i = 0; i < vs->info.num_outputs; i++) { |
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116 | if (vs->info.output_semantic_name[i] == TGSI_SEMANTIC_COLOR) { |
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117 | if (vs->info.output_semantic_index[i] == 0) |
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118 | twoside->attrib_front0 = i; |
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119 | else |
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120 | twoside->attrib_front1 = i; |
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121 | } |
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122 | if (vs->info.output_semantic_name[i] == TGSI_SEMANTIC_BCOLOR) { |
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123 | if (vs->info.output_semantic_index[i] == 0) |
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124 | twoside->attrib_back0 = i; |
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125 | else |
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126 | twoside->attrib_back1 = i; |
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127 | } |
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128 | } |
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129 | |||
130 | /* |
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131 | * We'll multiply the primitive's determinant by this sign to determine |
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132 | * if the triangle is back-facing (negative). |
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133 | * sign = -1 for CCW, +1 for CW |
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134 | */ |
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135 | twoside->sign = stage->draw->rasterizer->front_ccw ? -1.0f : 1.0f; |
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136 | |||
137 | stage->tri = twoside_tri; |
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138 | stage->tri( stage, header ); |
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139 | } |
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140 | |||
141 | |||
142 | static void twoside_flush( struct draw_stage *stage, unsigned flags ) |
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143 | { |
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144 | stage->tri = twoside_first_tri; |
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145 | stage->next->flush( stage->next, flags ); |
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146 | } |
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147 | |||
148 | |||
149 | static void twoside_reset_stipple_counter( struct draw_stage *stage ) |
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150 | { |
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151 | stage->next->reset_stipple_counter( stage->next ); |
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152 | } |
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153 | |||
154 | |||
155 | static void twoside_destroy( struct draw_stage *stage ) |
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156 | { |
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157 | draw_free_temp_verts( stage ); |
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158 | FREE( stage ); |
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159 | } |
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160 | |||
161 | |||
162 | /** |
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163 | * Create twoside pipeline stage. |
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164 | */ |
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165 | struct draw_stage *draw_twoside_stage( struct draw_context *draw ) |
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166 | { |
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167 | struct twoside_stage *twoside = CALLOC_STRUCT(twoside_stage); |
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168 | if (twoside == NULL) |
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169 | goto fail; |
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170 | |||
171 | twoside->stage.draw = draw; |
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172 | twoside->stage.name = "twoside"; |
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173 | twoside->stage.next = NULL; |
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174 | twoside->stage.point = draw_pipe_passthrough_point; |
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175 | twoside->stage.line = draw_pipe_passthrough_line; |
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176 | twoside->stage.tri = twoside_first_tri; |
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177 | twoside->stage.flush = twoside_flush; |
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178 | twoside->stage.reset_stipple_counter = twoside_reset_stipple_counter; |
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179 | twoside->stage.destroy = twoside_destroy; |
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180 | |||
181 | if (!draw_alloc_temp_verts( &twoside->stage, 3 )) |
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182 | goto fail; |
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183 | |||
184 | return &twoside->stage; |
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185 | |||
186 | fail: |
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187 | if (twoside) |
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188 | twoside->stage.destroy( &twoside->stage ); |
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189 | |||
190 | return NULL; |
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191 | }>>> |