| 1 | /* Copyright (c) 2001, Stanford University
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| 2 | * All rights reserved
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| 3 | *
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| 4 | * See the file LICENSE.txt for information on redistributing this software.
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| 5 | */
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| 6 |
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| 7 | #include "server_dispatch.h"
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| 8 | #include "server.h"
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| 9 | #include "cr_error.h"
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| 10 | #include "state/cr_statetypes.h"
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| 11 |
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| 12 |
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| 13 | static const CRmatrix identity_matrix = {
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| 14 | 1.0, 0.0, 0.0, 0.0,
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| 15 | 0.0, 1.0, 0.0, 0.0,
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| 16 | 0.0, 0.0, 1.0, 0.0,
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| 17 | 0.0, 0.0, 0.0, 1.0
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| 18 | };
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| 19 |
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| 20 |
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| 21 | /*
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| 22 | * Clip the rectangle q against the given image window.
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| 23 | */
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| 24 | static void
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| 25 | crServerViewportClipToWindow( const CRrecti *imagewindow, CRrecti *q)
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| 26 | {
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| 27 | if (q->x1 < imagewindow->x1) q->x1 = imagewindow->x1;
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| 28 | if (q->x1 > imagewindow->x2) q->x1 = imagewindow->x2;
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| 29 |
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| 30 | if (q->x2 > imagewindow->x2) q->x2 = imagewindow->x2;
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| 31 | if (q->x2 < imagewindow->x1) q->x2 = imagewindow->x1;
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| 32 |
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| 33 | if (q->y1 < imagewindow->y1) q->y1 = imagewindow->y1;
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| 34 | if (q->y1 > imagewindow->y2) q->y1 = imagewindow->y2;
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| 35 |
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| 36 | if (q->y2 > imagewindow->y2) q->y2 = imagewindow->y2;
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| 37 | if (q->y2 < imagewindow->y1) q->y2 = imagewindow->y1;
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| 38 | }
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| 39 |
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| 40 |
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| 41 | /*
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| 42 | * Translate the rectangle q from the image window space to the outputwindow
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| 43 | * space.
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| 44 | */
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| 45 | static void
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| 46 | crServerConvertToOutput( const CRrecti *imagewindow,
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| 47 | const CRrecti *outputwindow,
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| 48 | CRrecti *q )
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| 49 | {
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| 50 | q->x1 = q->x1 - imagewindow->x1 + outputwindow->x1;
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| 51 | q->x2 = q->x2 - imagewindow->x2 + outputwindow->x2;
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| 52 | q->y1 = q->y1 - imagewindow->y1 + outputwindow->y1;
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| 53 | q->y2 = q->y2 - imagewindow->y2 + outputwindow->y2;
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| 54 | }
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| 55 |
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| 56 |
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| 57 | /*
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| 58 | * Compute clipped image window, scissor, viewport and base projection
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| 59 | * info for each tile in the mural.
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| 60 | * Need to call this when either the viewport or mural is changed.
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| 61 | */
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| 62 | void
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| 63 | crServerComputeViewportBounds(const CRViewportState *v, CRMuralInfo *mural)
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| 64 | {
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| 65 | static GLuint serialNo = 1;
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| 66 | int i;
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| 67 |
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| 68 | for (i = 0; i < mural->numExtents; i++) {
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| 69 | CRExtent *extent = &mural->extents[i];
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| 70 | CRrecti q;
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| 71 |
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| 72 | /* If the scissor is disabled set it to the whole output.
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| 73 | ** We might as well use the actual scissorTest rather than
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| 74 | ** scissorValid - it never gets reset anyway.
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| 75 | */
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| 76 | if (!v->scissorTest)
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| 77 | {
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| 78 | extent->scissorBox = extent->outputwindow;
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| 79 | }
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| 80 | else
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| 81 | {
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| 82 | q.x1 = v->scissorX;
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| 83 | q.x2 = v->scissorX + v->scissorW;
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| 84 | q.y1 = v->scissorY;
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| 85 | q.y2 = v->scissorY + v->scissorH;
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| 86 |
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| 87 | crServerViewportClipToWindow(&(extent->imagewindow), &q);
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| 88 | crServerConvertToOutput(&(extent->imagewindow),
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| 89 | &(extent->outputwindow), &q);
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| 90 | extent->scissorBox = q;
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| 91 | }
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| 92 |
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| 93 | /* if the viewport is not valid,
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| 94 | ** set it to the entire output.
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| 95 | */
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| 96 | if (!v->viewportValid)
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| 97 | {
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| 98 | extent->clippedImagewindow = extent->imagewindow;
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| 99 | extent->viewport = extent->outputwindow;
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| 100 | }
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| 101 | else
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| 102 | {
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| 103 | q.x1 = v->viewportX;
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| 104 | q.x2 = v->viewportX + v->viewportW;
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| 105 | q.y1 = v->viewportY;
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| 106 | q.y2 = v->viewportY + v->viewportH;
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| 107 |
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| 108 | /* This is where the viewport gets clamped to the max size. */
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| 109 | crServerViewportClipToWindow(&(extent->imagewindow), &q);
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| 110 |
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| 111 | extent->clippedImagewindow = q;
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| 112 |
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| 113 | crServerConvertToOutput(&(extent->imagewindow),
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| 114 | &(extent->outputwindow), &q);
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| 115 |
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| 116 | extent->viewport = q;
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| 117 | }
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| 118 |
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| 119 | /*
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| 120 | ** Now, compute the base projection.
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| 121 | */
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| 122 | if (extent->clippedImagewindow.x1 == extent->clippedImagewindow.x2 ||
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| 123 | extent->clippedImagewindow.y1 == extent->clippedImagewindow.y2) {
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| 124 | /* zero-area extent, use identity matrix (doesn't really matter) */
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| 125 | extent->baseProjection = identity_matrix;
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| 126 | }
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| 127 | else
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| 128 | {
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| 129 | const int vpx = v->viewportX;
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| 130 | const int vpy = v->viewportY;
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| 131 | const int vpw = v->viewportW;
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| 132 | const int vph = v->viewportH;
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| 133 | GLfloat xscale, yscale;
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| 134 | GLfloat xtrans, ytrans;
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| 135 | CRrectf p;
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| 136 |
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| 137 | /*
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| 138 | * We need to take account of the current viewport parameters,
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| 139 | * and they are passed to this function as x, y, w, h.
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| 140 | * In the default case (from main.c) we pass the the
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| 141 | * full muralsize of 0, 0, width, height
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| 142 | */
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| 143 | p.x1 = (GLfloat) (extent->clippedImagewindow.x1 - vpx) / vpw;
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| 144 | p.y1 = (GLfloat) (extent->clippedImagewindow.y1 - vpy) / vph;
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| 145 | p.x2 = (GLfloat) (extent->clippedImagewindow.x2 - vpx) / vpw;
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| 146 | p.y2 = (GLfloat) (extent->clippedImagewindow.y2 - vpy) / vph;
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| 147 |
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| 148 | /* XXX not sure this clamping is really neeed anymore
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| 149 | */
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| 150 | if (p.x1 < 0.0) {
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| 151 | p.x1 = 0.0;
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| 152 | if (p.x2 > 1.0) p.x2 = 1.0;
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| 153 | }
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| 154 |
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| 155 | if (p.y1 < 0.0) {
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| 156 | p.y1 = 0.0;
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| 157 | if (p.y2 > 1.0) p.y2 = 1.0;
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| 158 | }
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| 159 |
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| 160 | /* Rescale [0,1] -> [-1,1] */
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| 161 | p.x1 = p.x1 * 2.0f - 1.0f;
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| 162 | p.x2 = p.x2 * 2.0f - 1.0f;
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| 163 | p.y1 = p.y1 * 2.0f - 1.0f;
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| 164 | p.y2 = p.y2 * 2.0f - 1.0f;
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| 165 |
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| 166 | xscale = 2.0f / (p.x2 - p.x1);
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| 167 | yscale = 2.0f / (p.y2 - p.y1);
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| 168 | xtrans = -(p.x2 + p.x1) / 2.0f;
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| 169 | ytrans = -(p.y2 + p.y1) / 2.0f;
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| 170 |
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| 171 | CRASSERT(xscale == xscale); /* NaN test */
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| 172 | CRASSERT(yscale == yscale);
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| 173 |
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| 174 | extent->baseProjection = identity_matrix;
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| 175 | extent->baseProjection.m00 = xscale;
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| 176 | extent->baseProjection.m11 = yscale;
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| 177 | extent->baseProjection.m30 = xtrans * xscale;
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| 178 | extent->baseProjection.m31 = ytrans * yscale;
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| 179 | }
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| 180 |
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| 181 | extent->serialNo = serialNo++;
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| 182 | }
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| 183 | mural->viewportValidated = GL_TRUE;
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| 184 | }
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| 185 |
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| 186 |
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| 187 | /*
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| 188 | * Issue the glScissor, glViewport and projection matrix needed for
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| 189 | * rendering the tile specified by extNum. We computed the scissor,
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| 190 | * viewport and projection parameters above in crServerComputeViewportBounds.
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| 191 | */
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| 192 | void
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| 193 | crServerSetOutputBounds( const CRMuralInfo *mural, int extNum )
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| 194 | {
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| 195 | const CRExtent *extent = mural->extents + extNum;
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| 196 | CRASSERT(mural->viewportValidated);
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| 197 |
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| 198 | /*
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| 199 | * Serial Number info:
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| 200 | * Everytime we compute new scissor, viewport, projection matrix info for
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| 201 | * a tile, we give that tile a new serial number.
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| 202 | * When we're about to render into a tile, we only update the scissor,
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| 203 | * viewport and projection matrix if the tile's serial number doesn't match
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| 204 | * the current serial number. This avoids a _LOT_ of redundant calls to
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| 205 | * those three functions.
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| 206 | */
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| 207 | if (extent->serialNo != cr_server.currentSerialNo) {
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| 208 | cr_server.head_spu->dispatch_table.Scissor(extent->scissorBox.x1,
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| 209 | extent->scissorBox.y1,
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| 210 | extent->scissorBox.x2 - extent->scissorBox.x1,
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| 211 | extent->scissorBox.y2 - extent->scissorBox.y1);
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| 212 |
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| 213 | cr_server.head_spu->dispatch_table.Viewport(extent->viewport.x1,
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| 214 | extent->viewport.y1,
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| 215 | extent->viewport.x2 - extent->viewport.x1,
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| 216 | extent->viewport.y2 - extent->viewport.y1);
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| 217 |
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| 218 | crServerApplyBaseProjection(&(extent->baseProjection));
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| 219 | cr_server.currentSerialNo = extent->serialNo;
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| 220 | }
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| 221 | }
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| 222 |
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| 223 |
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| 224 | /*
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| 225 | * Pre-multiply the current projection matrix with the current client's
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| 226 | * base projection. I.e. P' = b * P. Note that OpenGL's glMultMatrix
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| 227 | * POST-multiplies.
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| 228 | */
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| 229 | void
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| 230 | crServerApplyBaseProjection(const CRmatrix *baseProj)
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| 231 | {
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| 232 | const CRmatrix *projMatrix;
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| 233 | if (cr_server.projectionOverride) {
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| 234 | int eye = crServerGetCurrentEye();
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| 235 | projMatrix = &cr_server.projectionMatrix[eye];
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| 236 | }
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| 237 | else
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| 238 | projMatrix = cr_server.curClient->currentCtx->transform.projectionStack.top;
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| 239 |
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| 240 | cr_server.head_spu->dispatch_table.PushAttrib( GL_TRANSFORM_BIT );
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| 241 | cr_server.head_spu->dispatch_table.MatrixMode( GL_PROJECTION );
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| 242 | cr_server.head_spu->dispatch_table.LoadMatrixf( (const GLfloat *) baseProj );
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| 243 | cr_server.head_spu->dispatch_table.MultMatrixf( cr_server.alignment_matrix );
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| 244 | cr_server.head_spu->dispatch_table.MultMatrixf( (const GLfloat *) projMatrix );
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| 245 | cr_server.head_spu->dispatch_table.PopAttrib();
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| 246 | }
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| 247 |
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| 248 |
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| 249 | void
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| 250 | crServerApplyViewMatrix(const CRmatrix *view)
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| 251 | {
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| 252 | const CRmatrix *modelview = cr_server.curClient->currentCtx->transform.modelViewStack.top;
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| 253 |
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| 254 | cr_server.head_spu->dispatch_table.PushAttrib( GL_TRANSFORM_BIT );
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| 255 | cr_server.head_spu->dispatch_table.MatrixMode( GL_MODELVIEW );
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| 256 | cr_server.head_spu->dispatch_table.LoadMatrixf( (const GLfloat *) view );
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| 257 | cr_server.head_spu->dispatch_table.MultMatrixf( (const GLfloat *) modelview );
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| 258 | cr_server.head_spu->dispatch_table.PopAttrib();
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| 259 | }
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| 260 |
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| 261 |
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| 262 | /*
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| 263 | * Called via unpacker module.
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| 264 | * Note: when there's a tilesort SPU upstream, the viewport dimensions
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| 265 | * will typically match the mural size. That is, the viewport dimensions
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| 266 | * probably won't be the same values that the application issues.
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| 267 | */
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| 268 | void SERVER_DISPATCH_APIENTRY crServerDispatchViewport( GLint x, GLint y, GLsizei width, GLsizei height )
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| 269 | {
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| 270 | CRMuralInfo *mural = cr_server.curClient->currentMural;
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| 271 | CRContext *ctx = crStateGetCurrent();
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| 272 |
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| 273 | if (ctx->viewport.viewportX != x ||
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| 274 | ctx->viewport.viewportY != y ||
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| 275 | ctx->viewport.viewportW != width ||
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| 276 | ctx->viewport.viewportH != height) {
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| 277 | /* Note -- If there are tiles, this will be overridden in the
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| 278 | * process of decoding the BoundsInfo packet, so no worries. */
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| 279 | crStateViewport( x, y, width, height );
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| 280 |
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| 281 | mural->viewportValidated = GL_FALSE;
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| 282 | }
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| 283 |
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| 284 | /* always dispatch to be safe */
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| 285 | cr_server.head_spu->dispatch_table.Viewport( x, y, width, height );
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| 286 | }
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