| /* |
| * Mesa 3-D graphics library |
| * Version: 6.3 |
| * |
| * 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. |
| */ |
| |
| |
| #include "glheader.h" |
| #include "clip.h" |
| #include "context.h" |
| #include "macros.h" |
| #include "mtypes.h" |
| |
| #include "math/m_xform.h" |
| #include "math/m_matrix.h" |
| |
| |
| |
| /**********************************************************************/ |
| /* Get/Set User clip-planes. */ |
| /**********************************************************************/ |
| |
| |
| |
| void GLAPIENTRY |
| _mesa_ClipPlane( GLenum plane, const GLdouble *eq ) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| GLint p; |
| GLfloat equation[4]; |
| ASSERT_OUTSIDE_BEGIN_END(ctx); |
| |
| p = (GLint) plane - (GLint) GL_CLIP_PLANE0; |
| 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. |
| * |
| * KW: Eqn is then transformed to the current clip space, where user |
| * clipping now takes place. The clip-space equations are recalculated |
| * whenever the projection matrix changes. |
| */ |
| if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top)) |
| _math_matrix_analyse( ctx->ModelviewMatrixStack.Top ); |
| |
| _mesa_transform_vector( equation, equation, |
| ctx->ModelviewMatrixStack.Top->inv ); |
| |
| if (TEST_EQ_4V(ctx->Transform.EyeUserPlane[p], equation)) |
| return; |
| |
| FLUSH_VERTICES(ctx, _NEW_TRANSFORM); |
| COPY_4FV(ctx->Transform.EyeUserPlane[p], equation); |
| |
| /* Update derived state. This state also depends on the projection |
| * matrix, and is recalculated on changes to the projection matrix by |
| * code in _mesa_update_state(). |
| */ |
| if (ctx->Transform.ClipPlanesEnabled & (1 << p)) { |
| if (_math_matrix_is_dirty(ctx->ProjectionMatrixStack.Top)) |
| _math_matrix_analyse( ctx->ProjectionMatrixStack.Top ); |
| |
| _mesa_transform_vector( ctx->Transform._ClipUserPlane[p], |
| ctx->Transform.EyeUserPlane[p], |
| ctx->ProjectionMatrixStack.Top->inv ); |
| } |
| |
| if (ctx->Driver.ClipPlane) |
| ctx->Driver.ClipPlane( ctx, plane, equation ); |
| } |
| |
| |
| void GLAPIENTRY |
| _mesa_GetClipPlane( GLenum plane, GLdouble *equation ) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| GLint p; |
| ASSERT_OUTSIDE_BEGIN_END(ctx); |
| |
| p = (GLint) (plane - GL_CLIP_PLANE0); |
| if (p < 0 || p >= (GLint) ctx->Const.MaxClipPlanes) { |
| _mesa_error( ctx, GL_INVALID_ENUM, "glGetClipPlane" ); |
| return; |
| } |
| |
| equation[0] = (GLdouble) ctx->Transform.EyeUserPlane[p][0]; |
| equation[1] = (GLdouble) ctx->Transform.EyeUserPlane[p][1]; |
| equation[2] = (GLdouble) ctx->Transform.EyeUserPlane[p][2]; |
| equation[3] = (GLdouble) ctx->Transform.EyeUserPlane[p][3]; |
| } |
| |
| void GLAPIENTRY |
| _mesa_CullParameterfvEXT (GLenum cap, GLfloat *v) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| ASSERT_OUTSIDE_BEGIN_END(ctx); |
| |
| switch (cap) { |
| case GL_CULL_VERTEX_EYE_POSITION_EXT: |
| FLUSH_VERTICES(ctx, _NEW_TRANSFORM); |
| COPY_4FV(ctx->Transform.CullEyePos, v); |
| |
| _mesa_transform_vector( ctx->Transform.CullObjPos, |
| ctx->Transform.CullEyePos, |
| ctx->ModelviewMatrixStack.Top->inv ); |
| break; |
| |
| case GL_CULL_VERTEX_OBJECT_POSITION_EXT: |
| FLUSH_VERTICES(ctx, _NEW_TRANSFORM); |
| COPY_4FV(ctx->Transform.CullObjPos, v); |
| |
| _mesa_transform_vector( ctx->Transform.CullEyePos, |
| ctx->Transform.CullObjPos, |
| ctx->ModelviewMatrixStack.Top->m ); |
| break; |
| default: |
| _mesa_error( ctx, GL_INVALID_ENUM, "glCullParameterfvEXT" ); |
| } |
| } |
| |
| void GLAPIENTRY |
| _mesa_CullParameterdvEXT (GLenum cap, GLdouble *v) |
| { |
| GLfloat f[4]; |
| |
| f[0] = (GLfloat)v[0]; |
| f[1] = (GLfloat)v[1]; |
| f[2] = (GLfloat)v[2]; |
| f[3] = (GLfloat)v[3]; |
| |
| _mesa_CullParameterfvEXT(cap, f); |
| } |
| |