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4358 | Serge | 1 | /************************************************************************** |
2 | * |
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3 | * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas. |
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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 TUNGSTEN GRAPHICS 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 | /** |
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29 | * GL_SELECT and GL_FEEDBACK render modes. |
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30 | * Basically, we use a private instance of the 'draw' module for doing |
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31 | * selection/feedback. It would be nice to use the transform_feedback |
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32 | * hardware feature, but it's defined as happening pre-clip and we want |
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33 | * post-clipped primitives. Also, there's concerns about the efficiency |
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34 | * of using the hardware for this anyway. |
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35 | * |
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36 | * Authors: |
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37 | * Brian Paul |
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38 | */ |
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39 | |||
40 | #include "main/imports.h" |
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41 | #include "main/context.h" |
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42 | #include "main/feedback.h" |
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43 | |||
44 | #include "vbo/vbo.h" |
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45 | |||
46 | #include "st_context.h" |
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47 | #include "st_draw.h" |
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48 | #include "st_cb_feedback.h" |
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49 | |||
50 | #include "pipe/p_context.h" |
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51 | #include "pipe/p_defines.h" |
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52 | |||
53 | #include "draw/draw_context.h" |
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54 | #include "draw/draw_pipe.h" |
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55 | |||
56 | |||
57 | /** |
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58 | * This is actually used for both feedback and selection. |
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59 | */ |
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60 | struct feedback_stage |
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61 | { |
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62 | struct draw_stage stage; /**< Base class */ |
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63 | struct gl_context *ctx; /**< Rendering context */ |
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64 | GLboolean reset_stipple_counter; |
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65 | }; |
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66 | |||
67 | |||
68 | /********************************************************************** |
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69 | * GL Feedback functions |
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70 | **********************************************************************/ |
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71 | |||
72 | static INLINE struct feedback_stage * |
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73 | feedback_stage( struct draw_stage *stage ) |
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74 | { |
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75 | return (struct feedback_stage *)stage; |
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76 | } |
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77 | |||
78 | |||
79 | static void |
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80 | feedback_vertex(struct gl_context *ctx, const struct draw_context *draw, |
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81 | const struct vertex_header *v) |
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82 | { |
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83 | const struct st_context *st = st_context(ctx); |
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84 | GLfloat win[4]; |
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85 | const GLfloat *color, *texcoord; |
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86 | GLuint slot; |
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87 | |||
88 | win[0] = v->data[0][0]; |
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4401 | Serge | 89 | if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) |
4358 | Serge | 90 | win[1] = ctx->DrawBuffer->Height - v->data[0][1]; |
4401 | Serge | 91 | else |
92 | win[1] = v->data[0][1]; |
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4358 | Serge | 93 | win[2] = v->data[0][2]; |
94 | win[3] = 1.0F / v->data[0][3]; |
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95 | |||
96 | /* XXX |
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97 | * When we compute vertex layout, save info about position of the |
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98 | * color and texcoord attribs to use here. |
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99 | */ |
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100 | |||
101 | slot = st->vertex_result_to_slot[VARYING_SLOT_COL0]; |
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102 | if (slot != ~0U) |
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103 | color = v->data[slot]; |
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104 | else |
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105 | color = ctx->Current.Attrib[VERT_ATTRIB_COLOR0]; |
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106 | |||
107 | slot = st->vertex_result_to_slot[VARYING_SLOT_TEX0]; |
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108 | if (slot != ~0U) |
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109 | texcoord = v->data[slot]; |
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110 | else |
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111 | texcoord = ctx->Current.Attrib[VERT_ATTRIB_TEX0]; |
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112 | |||
113 | _mesa_feedback_vertex(ctx, win, color, texcoord); |
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114 | } |
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115 | |||
116 | |||
117 | static void |
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118 | feedback_tri( struct draw_stage *stage, struct prim_header *prim ) |
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119 | { |
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120 | struct feedback_stage *fs = feedback_stage(stage); |
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121 | struct draw_context *draw = stage->draw; |
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122 | _mesa_feedback_token(fs->ctx, (GLfloat) GL_POLYGON_TOKEN); |
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123 | _mesa_feedback_token(fs->ctx, (GLfloat) 3); /* three vertices */ |
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124 | feedback_vertex(fs->ctx, draw, prim->v[0]); |
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125 | feedback_vertex(fs->ctx, draw, prim->v[1]); |
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126 | feedback_vertex(fs->ctx, draw, prim->v[2]); |
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127 | } |
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128 | |||
129 | |||
130 | static void |
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131 | feedback_line( struct draw_stage *stage, struct prim_header *prim ) |
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132 | { |
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133 | struct feedback_stage *fs = feedback_stage(stage); |
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134 | struct draw_context *draw = stage->draw; |
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135 | if (fs->reset_stipple_counter) { |
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136 | _mesa_feedback_token(fs->ctx, (GLfloat) GL_LINE_RESET_TOKEN); |
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137 | fs->reset_stipple_counter = GL_FALSE; |
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138 | } |
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139 | else { |
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140 | _mesa_feedback_token(fs->ctx, (GLfloat) GL_LINE_TOKEN); |
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141 | } |
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142 | feedback_vertex(fs->ctx, draw, prim->v[0]); |
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143 | feedback_vertex(fs->ctx, draw, prim->v[1]); |
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144 | } |
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145 | |||
146 | |||
147 | static void |
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148 | feedback_point( struct draw_stage *stage, struct prim_header *prim ) |
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149 | { |
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150 | struct feedback_stage *fs = feedback_stage(stage); |
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151 | struct draw_context *draw = stage->draw; |
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152 | _mesa_feedback_token(fs->ctx, (GLfloat) GL_POINT_TOKEN); |
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153 | feedback_vertex(fs->ctx, draw, prim->v[0]); |
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154 | } |
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155 | |||
156 | |||
157 | static void |
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158 | feedback_flush( struct draw_stage *stage, unsigned flags ) |
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159 | { |
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160 | /* no-op */ |
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161 | } |
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162 | |||
163 | |||
164 | static void |
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165 | feedback_reset_stipple_counter( struct draw_stage *stage ) |
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166 | { |
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167 | struct feedback_stage *fs = feedback_stage(stage); |
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168 | fs->reset_stipple_counter = GL_TRUE; |
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169 | } |
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170 | |||
171 | |||
172 | static void |
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173 | feedback_destroy( struct draw_stage *stage ) |
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174 | { |
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175 | /* no-op */ |
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176 | } |
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177 | |||
178 | /** |
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179 | * Create GL feedback drawing stage. |
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180 | */ |
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181 | static struct draw_stage * |
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182 | draw_glfeedback_stage(struct gl_context *ctx, struct draw_context *draw) |
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183 | { |
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184 | struct feedback_stage *fs = ST_CALLOC_STRUCT(feedback_stage); |
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185 | |||
186 | fs->stage.draw = draw; |
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187 | fs->stage.next = NULL; |
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188 | fs->stage.point = feedback_point; |
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189 | fs->stage.line = feedback_line; |
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190 | fs->stage.tri = feedback_tri; |
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191 | fs->stage.flush = feedback_flush; |
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192 | fs->stage.reset_stipple_counter = feedback_reset_stipple_counter; |
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193 | fs->stage.destroy = feedback_destroy; |
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194 | fs->ctx = ctx; |
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195 | |||
196 | return &fs->stage; |
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197 | } |
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198 | |||
199 | |||
200 | |||
201 | /********************************************************************** |
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202 | * GL Selection functions |
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203 | **********************************************************************/ |
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204 | |||
205 | static void |
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206 | select_tri( struct draw_stage *stage, struct prim_header *prim ) |
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207 | { |
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208 | struct feedback_stage *fs = feedback_stage(stage); |
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209 | _mesa_update_hitflag( fs->ctx, prim->v[0]->data[0][2] ); |
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210 | _mesa_update_hitflag( fs->ctx, prim->v[1]->data[0][2] ); |
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211 | _mesa_update_hitflag( fs->ctx, prim->v[2]->data[0][2] ); |
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212 | } |
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213 | |||
214 | static void |
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215 | select_line( struct draw_stage *stage, struct prim_header *prim ) |
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216 | { |
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217 | struct feedback_stage *fs = feedback_stage(stage); |
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218 | _mesa_update_hitflag( fs->ctx, prim->v[0]->data[0][2] ); |
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219 | _mesa_update_hitflag( fs->ctx, prim->v[1]->data[0][2] ); |
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220 | } |
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221 | |||
222 | |||
223 | static void |
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224 | select_point( struct draw_stage *stage, struct prim_header *prim ) |
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225 | { |
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226 | struct feedback_stage *fs = feedback_stage(stage); |
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227 | _mesa_update_hitflag( fs->ctx, prim->v[0]->data[0][2] ); |
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228 | } |
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229 | |||
230 | |||
231 | static void |
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232 | select_flush( struct draw_stage *stage, unsigned flags ) |
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233 | { |
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234 | /* no-op */ |
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235 | } |
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236 | |||
237 | |||
238 | static void |
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239 | select_reset_stipple_counter( struct draw_stage *stage ) |
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240 | { |
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241 | /* no-op */ |
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242 | } |
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243 | |||
244 | static void |
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245 | select_destroy( struct draw_stage *stage ) |
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246 | { |
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247 | /* no-op */ |
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248 | } |
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249 | |||
250 | |||
251 | /** |
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252 | * Create GL selection mode drawing stage. |
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253 | */ |
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254 | static struct draw_stage * |
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255 | draw_glselect_stage(struct gl_context *ctx, struct draw_context *draw) |
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256 | { |
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257 | struct feedback_stage *fs = ST_CALLOC_STRUCT(feedback_stage); |
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258 | |||
259 | fs->stage.draw = draw; |
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260 | fs->stage.next = NULL; |
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261 | fs->stage.point = select_point; |
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262 | fs->stage.line = select_line; |
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263 | fs->stage.tri = select_tri; |
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264 | fs->stage.flush = select_flush; |
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265 | fs->stage.reset_stipple_counter = select_reset_stipple_counter; |
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266 | fs->stage.destroy = select_destroy; |
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267 | fs->ctx = ctx; |
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268 | |||
269 | return &fs->stage; |
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270 | } |
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271 | |||
272 | |||
273 | static void |
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274 | st_RenderMode(struct gl_context *ctx, GLenum newMode ) |
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275 | { |
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276 | struct st_context *st = st_context(ctx); |
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277 | struct draw_context *draw = st->draw; |
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278 | |||
279 | if (newMode == GL_RENDER) { |
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280 | /* restore normal VBO draw function */ |
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281 | vbo_set_draw_func(ctx, st_draw_vbo); |
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282 | } |
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283 | else if (newMode == GL_SELECT) { |
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284 | if (!st->selection_stage) |
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285 | st->selection_stage = draw_glselect_stage(ctx, draw); |
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286 | draw_set_rasterize_stage(draw, st->selection_stage); |
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287 | /* Plug in new vbo draw function */ |
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288 | vbo_set_draw_func(ctx, st_feedback_draw_vbo); |
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289 | } |
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290 | else { |
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291 | if (!st->feedback_stage) |
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292 | st->feedback_stage = draw_glfeedback_stage(ctx, draw); |
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293 | draw_set_rasterize_stage(draw, st->feedback_stage); |
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294 | /* Plug in new vbo draw function */ |
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295 | vbo_set_draw_func(ctx, st_feedback_draw_vbo); |
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296 | /* need to generate/use a vertex program that emits pos/color/tex */ |
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297 | st->dirty.st |= ST_NEW_VERTEX_PROGRAM; |
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298 | } |
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299 | } |
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300 | |||
301 | |||
302 | |||
303 | void st_init_feedback_functions(struct dd_function_table *functions) |
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304 | { |
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305 | functions->RenderMode = st_RenderMode; |
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306 | }>> |