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-rw-r--r--src/mesa/tnl/t_vb_cliptmp.h558
1 files changed, 161 insertions, 397 deletions
diff --git a/src/mesa/tnl/t_vb_cliptmp.h b/src/mesa/tnl/t_vb_cliptmp.h
index 1aeb014e15..5957f4960c 100644
--- a/src/mesa/tnl/t_vb_cliptmp.h
+++ b/src/mesa/tnl/t_vb_cliptmp.h
@@ -1,4 +1,4 @@
-/* $Id: t_vb_cliptmp.h,v 1.4 2000/12/28 22:11:05 keithw Exp $ */
+/* $Id: t_vb_cliptmp.h,v 1.5 2001/01/05 02:26:49 keithw Exp $ */
/*
* Mesa 3-D graphics library
@@ -28,340 +28,45 @@
*/
-#define INSIDE( J ) !NEGATIVE(J)
-#define OUTSIDE( J ) NEGATIVE(J)
+#define CLIP_DOTPROD(K, A, B, C, D) X(K)*A + Y(K)*B + Z(K)*C + W(K)*D
-
-
-
-static GLuint TAG(userclip_line)( GLcontext *ctx,
- GLuint *i, GLuint *j,
- interp_func interp )
-{
- struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
- GLfloat (*coord)[4] = VB->ClipPtr->data;
- GLuint ii = *i;
- GLuint jj = *j;
- GLuint p;
-
- for (p=0;p<MAX_CLIP_PLANES;p++) {
- if (ctx->Transform.ClipEnabled[p]) {
- GLfloat a = ctx->Transform._ClipUserPlane[p][0];
- GLfloat b = ctx->Transform._ClipUserPlane[p][1];
- GLfloat c = ctx->Transform._ClipUserPlane[p][2];
- GLfloat d = ctx->Transform._ClipUserPlane[p][3];
-
- GLfloat dpI = d*W(ii) + c*Z(ii) + b*Y(ii) + a*X(ii);
- GLfloat dpJ = d*W(jj) + c*Z(jj) + b*Y(jj) + a*X(jj);
-
- GLuint flagI = OUTSIDE( dpI );
- GLuint flagJ = OUTSIDE( dpJ );
-
- if (flagI ^ flagJ) {
- if (flagJ) {
- GLfloat t = dpI / (dpI - dpJ);
- VB->ClipMask[jj] |= CLIP_USER_BIT;
- jj = interp( ctx, t, ii, jj, GL_FALSE );
- VB->ClipMask[jj] = 0;
- } else {
- GLfloat t = dpJ / (dpJ - dpI);
- VB->ClipMask[ii] |= CLIP_USER_BIT;
- ii = interp( ctx, t, jj, ii, GL_FALSE );
- VB->ClipMask[ii] = 0;
- }
- }
- else if (flagI)
- return 0;
- }
- }
-
- *i = ii;
- *j = jj;
- return 1;
-}
-
-
-static GLuint TAG(userclip_polygon)( GLcontext *ctx,
- GLuint n,
- GLuint vlist[],
- interp_func interp )
-{
- struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
- GLfloat (*coord)[4] = VB->ClipPtr->data;
- GLuint vlist2[MAX_CLIPPED_VERTICES];
- GLuint *inlist = vlist, *outlist = vlist2;
- GLubyte *clipmask = VB->ClipMask;
- GLuint p;
-
-#define CLIP_DOTPROD(xx) d*W(xx) + c*Z(xx) + b*Y(xx) + a*X(xx)
-
- /* Can be speeded up to if vertex_stage actually saves the
- * UserClipMask, and if it is used in this loop (after computing a
- * UserClipOrMask).
- */
- for (p=0;p<MAX_CLIP_PLANES;p++) {
- if (ctx->Transform.ClipEnabled[p]) {
- register float a = ctx->Transform._ClipUserPlane[p][0];
- register float b = ctx->Transform._ClipUserPlane[p][1];
- register float c = ctx->Transform._ClipUserPlane[p][2];
- register float d = ctx->Transform._ClipUserPlane[p][3];
-
- /* initialize prev to be last in the input list */
- GLuint idxPrev = inlist[n-1];
- GLfloat dpPrev = CLIP_DOTPROD(idxPrev);
- GLuint outcount = 0;
- GLuint i;
-
- for (i = 0 ; i < n ; i++) {
- GLuint idx = inlist[i];
- GLfloat dp = CLIP_DOTPROD(idx);
-
- if (!NEGATIVE(dpPrev)) {
- outlist[outcount++] = idxPrev;
- clipmask[idxPrev] &= ~CLIP_USER_BIT;
- } else {
- clipmask[idxPrev] |= CLIP_USER_BIT;
- }
-
-
- if (DIFFERENT_SIGNS(dp, dpPrev)) {
- GLuint newvert;
- if (NEGATIVE(dp)) {
- /* Going out of bounds. Avoid division by zero as we
- * know dp != dpPrev from DIFFERENT_SIGNS, above.
- */
- GLfloat t = dp / (dp - dpPrev);
- newvert = interp( ctx, t, idx, idxPrev, GL_TRUE );
- } else {
- /* Coming back in.
- */
- GLfloat t = dpPrev / (dpPrev - dp);
- newvert = interp( ctx, t, idxPrev, idx, GL_FALSE );
- }
- clipmask[newvert] = 0;
- outlist[outcount++] = newvert;
- }
-
- idxPrev = idx;
- dpPrev = dp;
- }
-
- if (outcount < 3)
- return 0;
-
- {
- GLuint *tmp;
- tmp = inlist;
- inlist = outlist;
- outlist = tmp;
- n = outcount;
- }
- } /* if */
- } /* for p */
-
- if (inlist!=vlist) {
- GLuint i;
- for (i = 0 ; i < n ; i++)
- vlist[i] = inlist[i];
- }
-
- return n;
-}
-
-
-/* This now calls the user clip functions if required.
- */
-static void TAG(viewclip_line)( GLcontext *ctx,
- GLuint i, GLuint j,
- GLubyte mask )
-{
- struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
- interp_func interp = (interp_func) VB->interpfunc;
- GLfloat (*coord)[4] = VB->ClipPtr->data;
- GLuint ii = i, jj = j;
- GLuint vlist[2];
- GLuint n;
-
- VB->LastClipped = VB->FirstClipped;
-
-/*
- * We use 6 instances of this code to clip against the 6 planes.
- */
-#define GENERAL_CLIP \
- if (mask & PLANE) { \
- GLfloat dpI = CLIP_DOTPROD( ii ); \
- GLfloat dpJ = CLIP_DOTPROD( jj ); \
- \
- if (DIFFERENT_SIGNS(dpI, dpJ)) { \
- if (NEGATIVE(dpJ)) { \
- GLfloat t = dpI / (dpI - dpJ); \
- VB->ClipMask[jj] |= PLANE; \
- jj = interp( ctx, t, ii, jj, GL_FALSE ); \
- VB->ClipMask[jj] = 0; \
- } else { \
- GLfloat t = dpJ / (dpJ - dpI); \
- VB->ClipMask[ii] |= PLANE; \
- ii = interp( ctx, t, jj, ii, GL_FALSE ); \
- VB->ClipMask[ii] = 0; \
- } \
- } \
- else if (NEGATIVE(dpI)) \
- return; \
- }
-
-#undef CLIP_DOTPROD
-#define PLANE CLIP_RIGHT_BIT
-#define CLIP_DOTPROD(K) (- X(K) + W(K))
-
- GENERAL_CLIP
-
-#undef CLIP_DOTPROD
-#undef PLANE
-#define PLANE CLIP_LEFT_BIT
-#define CLIP_DOTPROD(K) (X(K) + W(K))
-
- GENERAL_CLIP
-
-#undef CLIP_DOTPROD
-#undef PLANE
-#define PLANE CLIP_TOP_BIT
-#define CLIP_DOTPROD(K) (- Y(K) + W(K))
-
- GENERAL_CLIP
-
-#undef CLIP_DOTPROD
-#undef PLANE
-#define PLANE CLIP_BOTTOM_BIT
-#define CLIP_DOTPROD(K) (Y(K) + W(K))
-
- GENERAL_CLIP
-
-#undef CLIP_DOTPROD
-#undef PLANE
-#define PLANE CLIP_FAR_BIT
-#define CLIP_DOTPROD(K) (- Z(K) + W(K))
-
- if (SIZE >= 3) {
- GENERAL_CLIP
- }
-
-#undef CLIP_DOTPROD
-#undef PLANE
-#define PLANE CLIP_NEAR_BIT
-#define CLIP_DOTPROD(K) (Z(K) + W(K))
-
- if (SIZE >=3 ) {
- GENERAL_CLIP
- }
-
-#undef CLIP_DOTPROD
-#undef PLANE
-#undef GENERAL_CLIP
-
-
- if (mask & CLIP_USER_BIT) {
- if ( TAG(userclip_line)( ctx, &ii, &jj, interp ) == 0 )
- return;
- }
-
- vlist[0] = ii;
- vlist[1] = jj;
- n = 2;
-
- /* If necessary, project new vertices.
- */
- {
- GLuint i, j;
- GLfloat (*proj)[4] = VB->ProjectedClipPtr->data;
- GLuint start = VB->FirstClipped;
-
- for (i = 0; i < n; i++) {
- j = vlist[i];
- if (j >= start) {
- if (SIZE == 4 && W(j) != 0.0F) {
- GLfloat wInv = 1.0F / W(j);
- proj[j][0] = X(j) * wInv;
- proj[j][1] = Y(j) * wInv;
- proj[j][2] = Z(j) * wInv;
- proj[j][3] = wInv;
- } else {
- proj[j][0] = X(j);
- proj[j][1] = Y(j);
- proj[j][2] = Z(j);
- proj[j][3] = W(j);
- }
- }
- }
- }
-
- if (ctx->Driver.BuildProjectedVertices)
- ctx->Driver.BuildProjectedVertices(ctx,
- VB->FirstClipped,
- VB->LastClipped,
- ~0);
-
-
- /* Render the new line.
- */
- ctx->Driver.LineFunc( ctx, ii, jj, j );
-}
-
-/* We now clip polygon triangles individually. This is necessary to
- * avoid artifacts dependent on where the boundary of the VB falls
- * within the polygon. As a result, there is an upper bound on the
- * number of vertices which may be created, and the test against VB_SIZE
- * is redundant.
- */
-static void TAG(viewclip_polygon)( GLcontext *ctx,
- GLuint n, GLuint vlist[], GLuint pv,
- GLubyte mask )
-{
- struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
- interp_func interp = (interp_func) VB->interpfunc;
- GLfloat (*coord)[4] = VB->ClipPtr->data;
- GLuint vlist2[MAX_CLIPPED_VERTICES];
- GLuint *inlist = vlist, *outlist = vlist2;
- GLuint i;
- GLubyte *clipmask = VB->ClipMask;
-
- VB->LastClipped = VB->FirstClipped;
-
- if (mask & CLIP_ALL_BITS) {
-
-#define GENERAL_CLIP \
+#define POLY_CLIP( PLANE, A, B, C, D ) \
+do { \
if (mask & PLANE) { \
- GLuint idxPrev = inlist[n-1]; \
- GLfloat dpPrev = CLIP_DOTPROD(idxPrev); \
+ GLuint idxPrev = inlist[0]; \
+ GLfloat dpPrev = CLIP_DOTPROD(idxPrev, A, B, C, D ); \
GLuint outcount = 0; \
GLuint i; \
- \
- mask &= ~PLANE; \
- \
- for (i = 0; i < n; i++) { \
+ \
+ inlist[n] = inlist[0]; /* prevent rotation of vertices */ \
+ for (i = 1; i <= n; i++) { \
GLuint idx = inlist[i]; \
- GLfloat dp = CLIP_DOTPROD(idx); \
+ GLfloat dp = CLIP_DOTPROD(idx, A, B, C, D ); \
\
+ clipmask[idxPrev] |= PLANE; \
if (!NEGATIVE(dpPrev)) { \
outlist[outcount++] = idxPrev; \
clipmask[idxPrev] &= ~PLANE; \
} \
\
if (DIFFERENT_SIGNS(dp, dpPrev)) { \
- GLuint newvert; \
+ GLuint newvert = VB->LastClipped++; \
+ VB->ClipMask[newvert] = 0; \
+ outlist[outcount++] = newvert; \
if (NEGATIVE(dp)) { \
/* Going out of bounds. Avoid division by zero as we \
* know dp != dpPrev from DIFFERENT_SIGNS, above. \
*/ \
GLfloat t = dp / (dp - dpPrev); \
- newvert = interp( ctx, t, idx, idxPrev, GL_TRUE ); \
- } else { \
+ LINTERP_SZ( t, coord, newvert, idx, idxPrev, SIZE ); \
+ interp( ctx, t, newvert, idx, idxPrev, GL_TRUE ); \
+ } else { \
/* Coming back in. \
*/ \
GLfloat t = dpPrev / (dpPrev - dp); \
- newvert = interp( ctx, t, idxPrev, idx, GL_FALSE ); \
+ LINTERP_SZ( t, coord, newvert, idxPrev, idx, SIZE ); \
+ interp( ctx, t, newvert, idxPrev, idx, GL_FALSE ); \
} \
- clipmask[newvert] = mask; \
- outlist[outcount++] = newvert; \
} \
\
idxPrev = idx; \
@@ -377,125 +82,184 @@ static void TAG(viewclip_polygon)( GLcontext *ctx,
outlist = tmp; \
n = outcount; \
} \
- }
-
-
-#define PLANE CLIP_RIGHT_BIT
-#define CLIP_DOTPROD(K) (- X(K) + W(K))
-
- GENERAL_CLIP
-
-#undef CLIP_DOTPROD
-#undef PLANE
-
-
-#define PLANE CLIP_LEFT_BIT
-#define CLIP_DOTPROD(K) (X(K) + W(K))
-
- GENERAL_CLIP
+ } \
+} while (0)
+
+
+#define LINE_CLIP(PLANE, A, B, C, D ) \
+do { \
+ if (mask & PLANE) { \
+ GLfloat dpI = CLIP_DOTPROD( ii, A, B, C, D ); \
+ GLfloat dpJ = CLIP_DOTPROD( jj, A, B, C, D ); \
+ \
+ if (DIFFERENT_SIGNS(dpI, dpJ)) { \
+ GLuint newvert = VB->LastClipped++; \
+ VB->ClipMask[newvert] = 0; \
+ if (NEGATIVE(dpJ)) { \
+ GLfloat t = dpI / (dpI - dpJ); \
+ VB->ClipMask[jj] |= PLANE; \
+ LINTERP_SZ( t, coord, newvert, ii, jj, SIZE ); \
+ interp( ctx, t, newvert, ii, jj, GL_FALSE ); \
+ jj = newvert; \
+ } else { \
+ GLfloat t = dpJ / (dpJ - dpI); \
+ VB->ClipMask[ii] |= PLANE; \
+ LINTERP_SZ( t, coord, newvert, jj, ii, SIZE ); \
+ interp( ctx, t, newvert, jj, ii, GL_FALSE ); \
+ ii = newvert; \
+ } \
+ } \
+ else if (NEGATIVE(dpI)) \
+ return; \
+ } \
+} while (0)
+
+
+/* Project if necessary.
+ */
+static void TAG(build_proj_verts)( GLcontext *ctx )
+{
+ struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
+ GLfloat (*coord)[4] = VB->ClipPtr->data;
+ GLfloat (*proj)[4] = VB->ProjectedClipPtr->data;
+ GLuint last = VB->LastClipped;
+ GLuint i;
-#undef CLIP_DOTPROD
-#undef PLANE
+ for (i = VB->FirstClipped; i < last; i++) {
+ if (VB->ClipMask[i] == 0) {
+ if (SIZE == 4 && W(i) != 0.0F) {
+ GLfloat wInv = 1.0F / W(i);
+ proj[i][0] = X(i) * wInv;
+ proj[i][1] = Y(i) * wInv;
+ proj[i][2] = Z(i) * wInv;
+ proj[i][3] = wInv;
+ } else {
+ proj[i][0] = X(i);
+ proj[i][1] = Y(i);
+ proj[i][2] = Z(i);
+ proj[i][3] = W(i);
+ }
+ }
+ }
-#define PLANE CLIP_TOP_BIT
-#define CLIP_DOTPROD(K) (- Y(K) + W(K))
+ ctx->Driver.BuildProjectedVertices(ctx,
+ VB->FirstClipped,
+ VB->LastClipped,
+ ~0);
+}
- GENERAL_CLIP
+/* Clip a line against the viewport and user clip planes.
+ */
+static void TAG(clip_line)( GLcontext *ctx,
+ GLuint i, GLuint j,
+ GLubyte mask )
+{
+ struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
+ interp_func interp = (interp_func) VB->interpfunc;
+ GLfloat (*coord)[4] = VB->ClipPtr->data;
+ GLuint ii = i, jj = j, p;
-#undef CLIP_DOTPROD
-#undef PLANE
+ VB->LastClipped = VB->FirstClipped;
-#define PLANE CLIP_BOTTOM_BIT
-#define CLIP_DOTPROD(K) (Y(K) + W(K))
+ if (mask & 0x3f) {
+ LINE_CLIP( CLIP_RIGHT_BIT, -1, 0, 0, 1 );
+ LINE_CLIP( CLIP_LEFT_BIT, 1, 0, 0, 1 );
+ LINE_CLIP( CLIP_TOP_BIT, 0, -1, 0, 1 );
+ LINE_CLIP( CLIP_BOTTOM_BIT, 0, 1, 0, 1 );
+ LINE_CLIP( CLIP_FAR_BIT, 0, 0, -1, 1 );
+ LINE_CLIP( CLIP_NEAR_BIT, 0, 0, 1, 1 );
+ }
- GENERAL_CLIP
+ if (mask & CLIP_USER_BIT) {
+ for (p=0;p<MAX_CLIP_PLANES;p++) {
+ if (ctx->Transform.ClipEnabled[p]) {
+ GLfloat a = ctx->Transform._ClipUserPlane[p][0];
+ GLfloat b = ctx->Transform._ClipUserPlane[p][1];
+ GLfloat c = ctx->Transform._ClipUserPlane[p][2];
+ GLfloat d = ctx->Transform._ClipUserPlane[p][3];
+ LINE_CLIP( CLIP_USER_BIT, a, b, c, d );
+ }
+ }
+ }
-#undef CLIP_DOTPROD
-#undef PLANE
+ TAG(build_proj_verts)( ctx );
-#define PLANE CLIP_FAR_BIT
-#define CLIP_DOTPROD(K) (- Z(K) + W(K))
+ if ((ctx->_TriangleCaps & DD_FLATSHADE) && j != jj)
+ VB->copypvfunc( ctx, jj, j );
- if (SIZE >= 3) {
- GENERAL_CLIP
- }
+ /* Render the new line.
+ */
+ ctx->Driver.LineFunc( ctx, ii, jj );
-#undef CLIP_DOTPROD
-#undef PLANE
+}
-#define PLANE CLIP_NEAR_BIT
-#define CLIP_DOTPROD(K) (Z(K) + W(K))
- if (SIZE >=3 ) {
- GENERAL_CLIP
- }
+/* Clip a triangle or quad against the viewport and user clip planes.
+ */
+static void TAG(clip_polygon)( GLcontext *ctx,
+ GLuint n, GLuint vlist[],
+ GLubyte mask )
+{
+ struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb;
+ interp_func interp = (interp_func) VB->interpfunc;
+ GLfloat (*coord)[4] = VB->ClipPtr->data;
+ GLuint pv = vlist[0];
+ GLuint vlist2[MAX_CLIPPED_VERTICES];
+ GLuint *inlist = vlist, *outlist = vlist2;
+ GLuint p;
+ GLubyte *clipmask = VB->ClipMask;
-#undef CLIP_DOTPROD
-#undef PLANE
-#undef GENERAL_CLIP
+ VB->LastClipped = VB->FirstClipped;
- if (inlist != vlist)
- for (i = 0 ; i < n ; i++)
- vlist[i] = inlist[i];
+ if (mask & 0x3f) {
+ POLY_CLIP( CLIP_RIGHT_BIT, -1, 0, 0, 1 );
+ POLY_CLIP( CLIP_LEFT_BIT, 1, 0, 0, 1 );
+ POLY_CLIP( CLIP_TOP_BIT, 0, -1, 0, 1 );
+ POLY_CLIP( CLIP_BOTTOM_BIT, 0, 1, 0, 1 );
+ POLY_CLIP( CLIP_FAR_BIT, 0, 0, -1, 1 );
+ POLY_CLIP( CLIP_NEAR_BIT, 0, 0, 1, 1 );
}
- /* Clip against user clipping planes in clip space.
- */
if (mask & CLIP_USER_BIT) {
- n = TAG(userclip_polygon)( ctx, n, vlist, interp );
- if (n < 3) return;
+ for (p=0;p<MAX_CLIP_PLANES;p++) {
+ if (ctx->Transform.ClipEnabled[p]) {
+ GLfloat a = ctx->Transform._ClipUserPlane[p][0];
+ GLfloat b = ctx->Transform._ClipUserPlane[p][1];
+ GLfloat c = ctx->Transform._ClipUserPlane[p][2];
+ GLfloat d = ctx->Transform._ClipUserPlane[p][3];
+ POLY_CLIP( CLIP_USER_BIT, a, b, c, d );
+ }
+ }
}
- /* Project if necessary.
- */
- {
- GLuint i;
- GLfloat (*proj)[4] = VB->ProjectedClipPtr->data;
- GLuint first = VB->FirstClipped;
-
- for (i = 0; i < n; i++) {
- GLuint j = vlist[i];
- if (j >= first) {
- if (SIZE == 4 && W(j) != 0.0F) {
- GLfloat wInv = 1.0F / W(j);
- proj[j][0] = X(j) * wInv;
- proj[j][1] = Y(j) * wInv;
- proj[j][2] = Z(j) * wInv;
- proj[j][3] = wInv;
- } else {
- proj[j][0] = X(j);
- proj[j][1] = Y(j);
- proj[j][2] = Z(j);
- proj[j][3] = W(j);
- }
- }
+ if (ctx->_TriangleCaps & DD_FLATSHADE) {
+ if (pv != inlist[0]) {
+ ASSERT( inlist[0] >= VB->FirstClipped );
+ VB->copypvfunc( ctx, inlist[0], pv );
}
}
- if (ctx->Driver.BuildProjectedVertices)
- ctx->Driver.BuildProjectedVertices(ctx,
- VB->FirstClipped,
- VB->LastClipped,
- ~0);
+ TAG(build_proj_verts)( ctx );
/* Render the new vertices as an unclipped polygon.
- * Argh - need to pass in pv...
*/
{
GLuint *tmp = VB->Elts;
- VB->Elts = vlist;
- render_poly_pv_raw_elts( ctx, 0, n, PRIM_BEGIN|PRIM_END, pv );
+ VB->Elts = inlist;
+ ctx->Driver.RenderTabElts[GL_POLYGON]( ctx, 0, n, PRIM_BEGIN|PRIM_END );
VB->Elts = tmp;
}
}
+
+
#undef W
#undef Z
#undef Y
#undef X
#undef SIZE
#undef TAG
-#undef INSIDE
-#undef OUTSIDE
+#undef POLY_CLIP
+#undef LINE_CLIP
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