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109 lines
3.6 KiB
C
109 lines
3.6 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 6.3
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*
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* Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <precomp.h>
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/**
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* Update derived clip plane state.
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*/
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void
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_mesa_update_clip_plane(struct gl_context *ctx, GLuint plane)
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{
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if (_math_matrix_is_dirty(ctx->ProjectionMatrixStack.Top))
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_math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
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/* Clip-Space Plane = Eye-Space Plane * Projection Matrix */
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_mesa_transform_vector(ctx->Transform._ClipUserPlane[plane],
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ctx->Transform.EyeUserPlane[plane],
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ctx->ProjectionMatrixStack.Top->inv);
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}
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void GLAPIENTRY
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_mesa_ClipPlane( GLenum plane, const GLdouble *eq )
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{
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GET_CURRENT_CONTEXT(ctx);
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GLint p;
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GLfloat equation[4];
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ASSERT_OUTSIDE_BEGIN_END(ctx);
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p = (GLint) plane - (GLint) GL_CLIP_PLANE0;
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if (p < 0 || p >= (GLint) ctx->Const.MaxClipPlanes) {
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_mesa_error( ctx, GL_INVALID_ENUM, "glClipPlane" );
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return;
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}
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equation[0] = (GLfloat) eq[0];
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equation[1] = (GLfloat) eq[1];
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equation[2] = (GLfloat) eq[2];
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equation[3] = (GLfloat) eq[3];
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/*
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* The equation is transformed by the transpose of the inverse of the
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* current modelview matrix and stored in the resulting eye coordinates.
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*
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* KW: Eqn is then transformed to the current clip space, where user
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* clipping now takes place. The clip-space equations are recalculated
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* whenever the projection matrix changes.
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*/
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if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top))
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_math_matrix_analyse( ctx->ModelviewMatrixStack.Top );
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_mesa_transform_vector( equation, equation,
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ctx->ModelviewMatrixStack.Top->inv );
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if (TEST_EQ_4V(ctx->Transform.EyeUserPlane[p], equation))
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return;
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FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
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COPY_4FV(ctx->Transform.EyeUserPlane[p], equation);
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if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
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_mesa_update_clip_plane(ctx, p);
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}
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if (ctx->Driver.ClipPlane)
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ctx->Driver.ClipPlane( ctx, plane, equation );
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}
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void GLAPIENTRY
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_mesa_GetClipPlane( GLenum plane, GLdouble *equation )
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{
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GET_CURRENT_CONTEXT(ctx);
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GLint p;
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ASSERT_OUTSIDE_BEGIN_END(ctx);
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p = (GLint) (plane - GL_CLIP_PLANE0);
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if (p < 0 || p >= (GLint) ctx->Const.MaxClipPlanes) {
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_mesa_error( ctx, GL_INVALID_ENUM, "glGetClipPlane" );
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return;
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}
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equation[0] = (GLdouble) ctx->Transform.EyeUserPlane[p][0];
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equation[1] = (GLdouble) ctx->Transform.EyeUserPlane[p][1];
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equation[2] = (GLdouble) ctx->Transform.EyeUserPlane[p][2];
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equation[3] = (GLdouble) ctx->Transform.EyeUserPlane[p][3];
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}
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