-/* $Id: clip.c,v 1.9 2000/09/26 20:53:53 brianp Exp $ */
-
/*
* Mesa 3-D graphics library
- * Version: 3.3
- *
- * Copyright (C) 1999 Brian Paul All Rights Reserved.
- *
+ *
+ * Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
+ *
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
- *
+ *
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
- *
+ *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
*/
-#ifdef PC_HEADER
-#include "all.h"
-#else
#include "glheader.h"
#include "clip.h"
#include "context.h"
#include "macros.h"
-#include "matrix.h"
-#include "mmath.h"
-#include "types.h"
-#include "vb.h"
-#include "xform.h"
-#endif
-
-
-
-
-#define CLIP_RGBA0 0x1
-#define CLIP_RGBA1 0x2
-#define CLIP_TEX0 0x4
-#define CLIP_TEX1 0x8
-#define CLIP_INDEX0 0x10
-#define CLIP_INDEX1 0x20
-#define CLIP_FOG_COORD 0x40
-
-
-/* Linear interpolation between A and B: */
-#define LINTERP( T, A, B ) ( (A) + (T) * ( (B) - (A) ) )
-
-
-
-#define INTERP_SZ( t, vec, to, a, b, sz ) \
-do { \
- switch (sz) { \
- case 4: vec[to][3] = LINTERP( t, vec[a][3], vec[b][3] ); \
- case 3: vec[to][2] = LINTERP( t, vec[a][2], vec[b][2] ); \
- case 2: vec[to][1] = LINTERP( t, vec[a][1], vec[b][1] ); \
- case 1: vec[to][0] = LINTERP( t, vec[a][0], vec[b][0] ); \
- } \
-} while(0)
-
-
-static clip_interp_func clip_interp_tab[0x80];
-
-#define IND 0
-#define NAME clip_nil
-#include "interp_tmp.h"
-
-#define IND (CLIP_RGBA0)
-#define NAME clipRGBA0
-#include "interp_tmp.h"
-
-#define IND (CLIP_RGBA0|CLIP_RGBA1)
-#define NAME clipRGBA0_RGBA1
-#include "interp_tmp.h"
-
-#define IND (CLIP_TEX0|CLIP_RGBA0)
-#define NAME clipTEX0_RGBA0
-#include "interp_tmp.h"
-
-#define IND (CLIP_TEX0|CLIP_RGBA0|CLIP_RGBA1)
-#define NAME clipTEX0_RGBA0_RGBA1
-#include "interp_tmp.h"
-
-#define IND (CLIP_TEX1|CLIP_TEX0|CLIP_RGBA0)
-#define NAME clipTEX1_TEX0_RGBA0
-#include "interp_tmp.h"
-
-#define IND (CLIP_TEX0)
-#define NAME clipTEX0
-#include "interp_tmp.h"
-
-#define IND (CLIP_TEX1|CLIP_TEX0)
-#define NAME clipTEX1_TEX0
-#include "interp_tmp.h"
-
-#define IND (CLIP_TEX1|CLIP_TEX0|CLIP_RGBA0|CLIP_RGBA1)
-#define NAME clipTEX1_TEX0_RGBA0_RGBA1
-#include "interp_tmp.h"
-
-#define IND (CLIP_INDEX0)
-#define NAME clipINDEX0
-#include "interp_tmp.h"
-
-#define IND (CLIP_INDEX0|CLIP_INDEX1)
-#define NAME clipINDEX0_INDEX1
-#include "interp_tmp.h"
-
-#define IND (CLIP_FOG_COORD)
-#define NAME clip_FOG
-#include "interp_tmp.h"
-
-#define IND (CLIP_RGBA0|CLIP_FOG_COORD)
-#define NAME clipRGBA0_FOG
-#include "interp_tmp.h"
-
-#define IND (CLIP_RGBA0|CLIP_RGBA1|CLIP_FOG_COORD)
-#define NAME clipRGBA0_RGBA1_FOG
-#include "interp_tmp.h"
-
-#define IND (CLIP_TEX0|CLIP_RGBA0|CLIP_FOG_COORD)
-#define NAME clipTEX0_RGBA0_FOG
-#include "interp_tmp.h"
-
-#define IND (CLIP_TEX0|CLIP_RGBA0|CLIP_RGBA1|CLIP_FOG_COORD)
-#define NAME clipTEX0_RGBA0_RGBA1_FOG
-#include "interp_tmp.h"
-
-#define IND (CLIP_TEX1|CLIP_TEX0|CLIP_RGBA0|CLIP_FOG_COORD)
-#define NAME clipTEX1_TEX0_RGBA0_FOG
-#include "interp_tmp.h"
-
-#define IND (CLIP_TEX0|CLIP_FOG_COORD)
-#define NAME clipTEX0_FOG
-#include "interp_tmp.h"
+#include "mtypes.h"
-#define IND (CLIP_TEX1|CLIP_TEX0|CLIP_FOG_COORD)
-#define NAME clipTEX1_TEX0_FOG
-#include "interp_tmp.h"
+#include "math/m_matrix.h"
-#define IND (CLIP_TEX1|CLIP_TEX0|CLIP_RGBA0|CLIP_RGBA1|CLIP_FOG_COORD)
-#define NAME clipTEX1_TEX0_RGBA0_RGBA1_FOG
-#include "interp_tmp.h"
-#define IND (CLIP_INDEX0|CLIP_FOG_COORD)
-#define NAME clipINDEX0_FOG
-#include "interp_tmp.h"
-
-#define IND (CLIP_INDEX0|CLIP_INDEX1|CLIP_FOG_COORD)
-#define NAME clipINDEX0_INDEX1_FOG
-#include "interp_tmp.h"
-
-
-
-
-/**********************************************************************/
-/* Get/Set User clip-planes. */
-/**********************************************************************/
+/**
+ * Update derived clip plane state.
+ */
+void
+_mesa_update_clip_plane(struct gl_context *ctx, GLuint plane)
+{
+ if (_math_matrix_is_dirty(ctx->ProjectionMatrixStack.Top))
+ _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
+ /* Clip-Space Plane = Eye-Space Plane * Projection Matrix */
+ _mesa_transform_vector(ctx->Transform._ClipUserPlane[plane],
+ ctx->Transform.EyeUserPlane[plane],
+ ctx->ProjectionMatrixStack.Top->inv);
+}
-void
+void GLAPIENTRY
_mesa_ClipPlane( GLenum plane, const GLdouble *eq )
{
GET_CURRENT_CONTEXT(ctx);
GLint p;
GLfloat equation[4];
- equation[0] = eq[0];
- equation[1] = eq[1];
- equation[2] = eq[2];
- equation[3] = eq[3];
-
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glClipPlane");
-
p = (GLint) plane - (GLint) GL_CLIP_PLANE0;
- if (p<0 || p>=MAX_CLIP_PLANES) {
- gl_error( ctx, GL_INVALID_ENUM, "glClipPlane" );
+ if (p < 0 || p >= (GLint) ctx->Const.MaxClipPlanes) {
+ _mesa_error( ctx, GL_INVALID_ENUM, "glClipPlane" );
return;
}
+ equation[0] = (GLfloat) eq[0];
+ equation[1] = (GLfloat) eq[1];
+ equation[2] = (GLfloat) eq[2];
+ equation[3] = (GLfloat) eq[3];
+
/*
* The equation is transformed by the transpose of the inverse of the
* current modelview matrix and stored in the resulting eye coordinates.
* clipping now takes place. The clip-space equations are recalculated
* whenever the projection matrix changes.
*/
- if (ctx->ModelView.flags & MAT_DIRTY_ALL_OVER) {
- gl_matrix_analyze( &ctx->ModelView );
- }
- gl_transform_vector( ctx->Transform.EyeUserPlane[p], equation,
- ctx->ModelView.inv );
-
+ if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top))
+ _math_matrix_analyse( ctx->ModelviewMatrixStack.Top );
- if (ctx->Transform.ClipEnabled[p]) {
- ctx->NewState |= NEW_USER_CLIP;
+ _mesa_transform_vector( equation, equation,
+ ctx->ModelviewMatrixStack.Top->inv );
- if (ctx->ProjectionMatrix.flags & MAT_DIRTY_ALL_OVER) {
- gl_matrix_analyze( &ctx->ProjectionMatrix );
- }
- gl_transform_vector( ctx->Transform.ClipUserPlane[p],
- ctx->Transform.EyeUserPlane[p],
- ctx->ProjectionMatrix.inv );
- }
-}
+ if (TEST_EQ_4V(ctx->Transform.EyeUserPlane[p], equation))
+ return;
+ /* EyeUserPlane is used by program state constants. */
+ FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
+ ctx->NewDriverState |= ctx->DriverFlags.NewClipPlane;
+ COPY_4FV(ctx->Transform.EyeUserPlane[p], equation);
-void gl_update_userclip( GLcontext *ctx )
-{
- GLuint p;
-
- for (p = 0 ; p < MAX_CLIP_PLANES ; p++) {
- if (ctx->Transform.ClipEnabled[p]) {
- gl_transform_vector( ctx->Transform.ClipUserPlane[p],
- ctx->Transform.EyeUserPlane[p],
- ctx->ProjectionMatrix.inv );
- }
+ if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
+ _mesa_update_clip_plane(ctx, p);
}
+
+ if (ctx->Driver.ClipPlane)
+ ctx->Driver.ClipPlane( ctx, plane, equation );
}
-void
+
+void GLAPIENTRY
_mesa_GetClipPlane( GLenum plane, GLdouble *equation )
{
GET_CURRENT_CONTEXT(ctx);
GLint p;
- ASSERT_OUTSIDE_BEGIN_END(ctx, "glGetClipPlane");
-
-
p = (GLint) (plane - GL_CLIP_PLANE0);
- if (p<0 || p>=MAX_CLIP_PLANES) {
- gl_error( ctx, GL_INVALID_ENUM, "glGetClipPlane" );
+ if (p < 0 || p >= (GLint) ctx->Const.MaxClipPlanes) {
+ _mesa_error( ctx, GL_INVALID_ENUM, "glGetClipPlane" );
return;
}
equation[2] = (GLdouble) ctx->Transform.EyeUserPlane[p][2];
equation[3] = (GLdouble) ctx->Transform.EyeUserPlane[p][3];
}
-
-
-
-
-/**********************************************************************/
-/* View volume clipping. */
-/**********************************************************************/
-
-
-/*
- * Clip a point against the view volume.
- * Input: v - vertex-vector describing the point to clip
- * Return: 0 = outside view volume
- * 1 = inside view volume
- */
-GLuint gl_viewclip_point( const GLfloat v[] )
-{
- if ( v[0] > v[3] || v[0] < -v[3]
- || v[1] > v[3] || v[1] < -v[3]
- || v[2] > v[3] || v[2] < -v[3] ) {
- return 0;
- }
- else {
- return 1;
- }
-}
-
-/*
- * Clip a point against the user clipping planes.
- * Input: v - vertex-vector describing the point to clip.
- * Return: 0 = point was clipped
- * 1 = point not clipped
- */
-GLuint gl_userclip_point( GLcontext* ctx, const GLfloat v[] )
-{
- GLuint p;
-
- for (p=0;p<MAX_CLIP_PLANES;p++) {
- if (ctx->Transform.ClipEnabled[p]) {
- GLfloat dot = v[0] * ctx->Transform.ClipUserPlane[p][0]
- + v[1] * ctx->Transform.ClipUserPlane[p][1]
- + v[2] * ctx->Transform.ClipUserPlane[p][2]
- + v[3] * ctx->Transform.ClipUserPlane[p][3];
- if (dot < 0.0F) {
- return 0;
- }
- }
- }
-
- return 1;
-}
-
-
-
-
-#if 0
-#define NEGATIVE(x) ((*(int *)&x)<0)
-#define DIFFERENT_SIGNS(a,b) ((a*b) < 0)
-#else
-#define NEGATIVE(x) (x < 0)
-#define DIFFERENT_SIGNS(a,b) ((a*b) < 0)
-#endif
-
-
-static clip_poly_func gl_poly_clip_tab[2][5];
-static clip_line_func gl_line_clip_tab[2][5];
-
-#define W(i) coord[i][3]
-#define Z(i) coord[i][2]
-#define Y(i) coord[i][1]
-#define X(i) coord[i][0]
-#define SIZE 4
-#define IND 0
-#define TAG(x) x##_4
-#include "clip_funcs.h"
-
-#define W(i) 1.0
-#define Z(i) coord[i][2]
-#define Y(i) coord[i][1]
-#define X(i) coord[i][0]
-#define SIZE 3
-#define IND 0
-#define TAG(x) x##_3
-#include "clip_funcs.h"
-
-#define W(i) 1.0
-#define Z(i) 0.0
-#define Y(i) coord[i][1]
-#define X(i) coord[i][0]
-#define SIZE 2
-#define IND 0
-#define TAG(x) x##_2
-#include "clip_funcs.h"
-
-#define W(i) coord[i][3]
-#define Z(i) coord[i][2]
-#define Y(i) coord[i][1]
-#define X(i) coord[i][0]
-#define SIZE 4
-#define IND CLIP_TAB_EDGEFLAG
-#define TAG(x) x##_4_edgeflag
-#include "clip_funcs.h"
-
-#define W(i) 1.0
-#define Z(i) coord[i][2]
-#define Y(i) coord[i][1]
-#define X(i) coord[i][0]
-#define SIZE 3
-#define IND CLIP_TAB_EDGEFLAG
-#define TAG(x) x##_3_edgeflag
-#include "clip_funcs.h"
-
-#define W(i) 1.0
-#define Z(i) 0.0
-#define Y(i) coord[i][1]
-#define X(i) coord[i][0]
-#define SIZE 2
-#define IND CLIP_TAB_EDGEFLAG
-#define TAG(x) x##_2_edgeflag
-#include "clip_funcs.h"
-
-
-
-
-void gl_update_clipmask( GLcontext *ctx )
-{
- GLuint mask = 0;
-
- if (ctx->Visual.RGBAflag)
- {
- mask |= CLIP_RGBA0;
-
- if (ctx->TriangleCaps & (DD_TRI_LIGHT_TWOSIDE|DD_SEPERATE_SPECULAR))
- mask |= CLIP_RGBA1;
-
- if (ctx->Texture.ReallyEnabled & 0xf0)
- mask |= CLIP_TEX1|CLIP_TEX0;
-
- if (ctx->Texture.ReallyEnabled & 0xf)
- mask |= CLIP_TEX0;
- }
- else if (ctx->Light.ShadeModel==GL_SMOOTH)
- {
- mask |= CLIP_INDEX0;
-
- if (ctx->TriangleCaps & DD_TRI_LIGHT_TWOSIDE)
- mask |= CLIP_INDEX1;
- }
-
- if (ctx->FogMode == FOG_FRAGMENT && (ctx->TriangleCaps & DD_CLIP_FOG_COORD))
- mask |= CLIP_FOG_COORD;
-
- ctx->ClipInterpFunc = clip_interp_tab[mask];
- ctx->poly_clip_tab = gl_poly_clip_tab[0];
- ctx->line_clip_tab = gl_line_clip_tab[0];
-
- if (ctx->TriangleCaps & DD_TRI_UNFILLED) {
- ctx->poly_clip_tab = gl_poly_clip_tab[1];
- ctx->line_clip_tab = gl_line_clip_tab[0];
- }
-}
-
-
-#define USER_CLIPTEST(NAME, SZ) \
-static void NAME( struct vertex_buffer *VB ) \
-{ \
- GLcontext *ctx = VB->ctx; \
- GLubyte *clipMask = VB->ClipMask; \
- GLubyte *userClipMask = VB->UserClipMask; \
- GLuint start = VB->Start; \
- GLuint count = VB->Count; \
- GLuint p, i; \
- GLubyte bit; \
- \
- \
- for (bit = 1, p = 0; p < MAX_CLIP_PLANES ; p++, bit *=2) \
- if (ctx->Transform.ClipEnabled[p]) { \
- GLuint nr = 0; \
- const GLfloat a = ctx->Transform.ClipUserPlane[p][0]; \
- const GLfloat b = ctx->Transform.ClipUserPlane[p][1]; \
- const GLfloat c = ctx->Transform.ClipUserPlane[p][2]; \
- const GLfloat d = ctx->Transform.ClipUserPlane[p][3]; \
- GLfloat *coord = VB->ClipPtr->start; \
- GLuint stride = VB->ClipPtr->stride; \
- \
- for (i = start ; i < count ; i++, STRIDE_F(coord, stride)) { \
- GLfloat dp = coord[0] * a + coord[1] * b; \
- if (SZ > 2) dp += coord[2] * c; \
- if (SZ > 3) dp += coord[3] * d; else dp += d; \
- \
- if (dp < 0) { \
- clipMask[i] |= CLIP_USER_BIT; \
- userClipMask[i] |= bit; \
- nr++; \
- } \
- } \
- \
- if (nr > 0) { \
- VB->ClipOrMask |= CLIP_USER_BIT; \
- VB->CullMode |= CLIP_MASK_ACTIVE; \
- if (nr == count - start) { \
- VB->ClipAndMask |= CLIP_USER_BIT; \
- VB->Culled = 1; \
- return; \
- } \
- } \
- } \
-}
-
-
-USER_CLIPTEST(userclip2, 2)
-USER_CLIPTEST(userclip3, 3)
-USER_CLIPTEST(userclip4, 4)
-
-static void (*(usercliptab[5]))( struct vertex_buffer * ) = {
- 0,
- 0,
- userclip2,
- userclip3,
- userclip4
-};
-
-void gl_user_cliptest( struct vertex_buffer *VB )
-{
- usercliptab[VB->ClipPtr->size]( VB );
-}
-
-
-void gl_init_clip(void)
-{
- init_clip_funcs_4();
- init_clip_funcs_3();
- init_clip_funcs_2();
-
- init_clip_funcs_4_edgeflag();
- init_clip_funcs_3_edgeflag();
- init_clip_funcs_2_edgeflag();
-
- clip_interp_tab[0] = clip_nil;
- clip_interp_tab[CLIP_RGBA0] = clipRGBA0;
- clip_interp_tab[CLIP_RGBA0|CLIP_RGBA1] = clipRGBA0_RGBA1;
- clip_interp_tab[CLIP_TEX0|CLIP_RGBA0] = clipTEX0_RGBA0;
- clip_interp_tab[CLIP_TEX0|CLIP_RGBA0|CLIP_RGBA1] = clipTEX0_RGBA0_RGBA1;
- clip_interp_tab[CLIP_TEX1|CLIP_TEX0|CLIP_RGBA0] = clipTEX1_TEX0_RGBA0;
- clip_interp_tab[CLIP_TEX1|CLIP_TEX0|CLIP_RGBA0|CLIP_RGBA1] =
- clipTEX1_TEX0_RGBA0_RGBA1;
- clip_interp_tab[CLIP_TEX0] = clipTEX0;
- clip_interp_tab[CLIP_TEX1|CLIP_TEX0] = clipTEX1_TEX0;
- clip_interp_tab[CLIP_INDEX0] = clipINDEX0;
- clip_interp_tab[CLIP_INDEX0|CLIP_INDEX1] = clipINDEX0_INDEX1;
-
- clip_interp_tab[CLIP_FOG_COORD] = clip_FOG;
- clip_interp_tab[CLIP_RGBA0|CLIP_FOG_COORD] = clipRGBA0_FOG;
- clip_interp_tab[CLIP_RGBA0|CLIP_RGBA1|CLIP_FOG_COORD] = clipRGBA0_RGBA1_FOG;
- clip_interp_tab[CLIP_TEX0|CLIP_RGBA0|CLIP_FOG_COORD] = clipTEX0_RGBA0_FOG;
- clip_interp_tab[CLIP_TEX0|CLIP_RGBA0|CLIP_RGBA1|CLIP_FOG_COORD] = clipTEX0_RGBA0_RGBA1_FOG;
- clip_interp_tab[CLIP_TEX1|CLIP_TEX0|CLIP_RGBA0|CLIP_FOG_COORD] = clipTEX1_TEX0_RGBA0_FOG;
- clip_interp_tab[CLIP_TEX1|CLIP_TEX0|CLIP_RGBA0|CLIP_RGBA1|CLIP_FOG_COORD] =
- clipTEX1_TEX0_RGBA0_RGBA1_FOG;
- clip_interp_tab[CLIP_TEX0|CLIP_FOG_COORD] = clipTEX0_FOG;
- clip_interp_tab[CLIP_TEX1|CLIP_TEX0|CLIP_FOG_COORD] = clipTEX1_TEX0_FOG;
- clip_interp_tab[CLIP_INDEX0|CLIP_FOG_COORD] = clipINDEX0_FOG;
- clip_interp_tab[CLIP_INDEX0|CLIP_INDEX1|CLIP_FOG_COORD] = clipINDEX0_INDEX1_FOG;
-}
-
projects / mesa.git / blobdiff