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4358 | Serge | 1 | /* |
2 | * Copyright © 2009 Intel Corporation |
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3 | * |
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4 | * Permission is hereby granted, free of charge, to any person obtaining a |
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5 | * copy of this software and associated documentation files (the "Software"), |
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6 | * to deal in the Software without restriction, including without limitation |
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7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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8 | * and/or sell copies of the Software, and to permit persons to whom the |
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9 | * Software is furnished to do so, subject to the following conditions: |
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10 | * |
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11 | * The above copyright notice and this permission notice (including the next |
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12 | * paragraph) shall be included in all copies or substantial portions of the |
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13 | * Software. |
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14 | * |
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15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
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21 | * IN THE SOFTWARE. |
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22 | * |
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23 | * Authors: |
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24 | * Eric Anholt |
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25 | * |
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26 | */ |
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27 | |||
28 | #include "brw_context.h" |
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29 | #include "brw_state.h" |
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30 | #include "brw_defines.h" |
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31 | #include "intel_batchbuffer.h" |
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32 | #include "main/fbobject.h" |
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33 | |||
34 | /* The clip VP defines the guardband region where expensive clipping is skipped |
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35 | * and fragments are allowed to be generated and clipped out cheaply by the SF. |
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36 | */ |
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37 | static void |
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38 | gen6_upload_clip_vp(struct brw_context *brw) |
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39 | { |
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40 | struct gl_context *ctx = &brw->ctx; |
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41 | struct brw_clipper_viewport *vp; |
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42 | |||
43 | vp = brw_state_batch(brw, AUB_TRACE_CLIP_VP_STATE, |
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44 | sizeof(*vp), 32, &brw->clip.vp_offset); |
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45 | |||
46 | /* According to the "Vertex X,Y Clamping and Quantization" section of the |
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47 | * Strips and Fans documentation, objects must not have a screen-space |
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48 | * extents of over 8192 pixels, or they may be mis-rasterized. The maximum |
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49 | * screen space coordinates of a small object may larger, but we have no |
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50 | * way to enforce the object size other than through clipping. |
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51 | * |
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52 | * If you're surprised that we set clip to -gbx to +gbx and it seems like |
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53 | * we'll end up with 16384 wide, note that for a 8192-wide render target, |
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54 | * we'll end up with a normal (-1, 1) clip volume that just covers the |
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55 | * drawable. |
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56 | */ |
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57 | const float maximum_post_clamp_delta = 8192; |
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58 | float gbx = maximum_post_clamp_delta / (float) ctx->Viewport.Width; |
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59 | float gby = maximum_post_clamp_delta / (float) ctx->Viewport.Height; |
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60 | |||
61 | vp->xmin = -gbx; |
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62 | vp->xmax = gbx; |
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63 | vp->ymin = -gby; |
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64 | vp->ymax = gby; |
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65 | |||
66 | brw->state.dirty.cache |= CACHE_NEW_CLIP_VP; |
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67 | } |
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68 | |||
69 | const struct brw_tracked_state gen6_clip_vp = { |
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70 | .dirty = { |
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71 | .mesa = _NEW_VIEWPORT, |
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72 | .brw = BRW_NEW_BATCH, |
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73 | .cache = 0, |
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74 | }, |
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75 | .emit = gen6_upload_clip_vp, |
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76 | }; |
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77 | |||
78 | static void |
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79 | gen6_upload_sf_vp(struct brw_context *brw) |
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80 | { |
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81 | struct gl_context *ctx = &brw->ctx; |
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82 | const GLfloat depth_scale = 1.0F / ctx->DrawBuffer->_DepthMaxF; |
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83 | struct brw_sf_viewport *sfv; |
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84 | GLfloat y_scale, y_bias; |
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85 | const bool render_to_fbo = _mesa_is_user_fbo(ctx->DrawBuffer); |
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86 | const GLfloat *v = ctx->Viewport._WindowMap.m; |
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87 | |||
88 | sfv = brw_state_batch(brw, AUB_TRACE_SF_VP_STATE, |
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89 | sizeof(*sfv), 32, &brw->sf.vp_offset); |
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90 | memset(sfv, 0, sizeof(*sfv)); |
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91 | |||
92 | /* _NEW_BUFFERS */ |
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93 | if (render_to_fbo) { |
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94 | y_scale = 1.0; |
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95 | y_bias = 0; |
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96 | } else { |
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97 | y_scale = -1.0; |
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98 | y_bias = ctx->DrawBuffer->Height; |
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99 | } |
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100 | |||
101 | /* _NEW_VIEWPORT */ |
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102 | sfv->viewport.m00 = v[MAT_SX]; |
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103 | sfv->viewport.m11 = v[MAT_SY] * y_scale; |
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104 | sfv->viewport.m22 = v[MAT_SZ] * depth_scale; |
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105 | sfv->viewport.m30 = v[MAT_TX]; |
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106 | sfv->viewport.m31 = v[MAT_TY] * y_scale + y_bias; |
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107 | sfv->viewport.m32 = v[MAT_TZ] * depth_scale; |
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108 | |||
109 | brw->state.dirty.cache |= CACHE_NEW_SF_VP; |
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110 | } |
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111 | |||
112 | const struct brw_tracked_state gen6_sf_vp = { |
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113 | .dirty = { |
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114 | .mesa = _NEW_VIEWPORT | _NEW_BUFFERS, |
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115 | .brw = BRW_NEW_BATCH, |
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116 | .cache = 0, |
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117 | }, |
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118 | .emit = gen6_upload_sf_vp, |
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119 | }; |
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120 | |||
121 | static void upload_viewport_state_pointers(struct brw_context *brw) |
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122 | { |
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123 | BEGIN_BATCH(4); |
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124 | OUT_BATCH(_3DSTATE_VIEWPORT_STATE_POINTERS << 16 | (4 - 2) | |
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125 | GEN6_CC_VIEWPORT_MODIFY | |
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126 | GEN6_SF_VIEWPORT_MODIFY | |
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127 | GEN6_CLIP_VIEWPORT_MODIFY); |
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128 | OUT_BATCH(brw->clip.vp_offset); |
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129 | OUT_BATCH(brw->sf.vp_offset); |
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130 | OUT_BATCH(brw->cc.vp_offset); |
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131 | ADVANCE_BATCH(); |
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132 | } |
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133 | |||
134 | const struct brw_tracked_state gen6_viewport_state = { |
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135 | .dirty = { |
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136 | .mesa = 0, |
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137 | .brw = (BRW_NEW_BATCH | |
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138 | BRW_NEW_STATE_BASE_ADDRESS), |
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139 | .cache = (CACHE_NEW_CLIP_VP | |
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140 | CACHE_NEW_SF_VP | |
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141 | CACHE_NEW_CC_VP) |
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142 | }, |
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143 | .emit = upload_viewport_state_pointers, |
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144 | };><> |