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|---|
| /* |
| * Mesa 3-D graphics library |
| * |
| * 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 |
| * 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. |
| */ |
| |
| |
| #include "glheader.h" |
| #include "clip.h" |
| #include "context.h" |
| #include "macros.h" |
| #include "mtypes.h" |
| |
| #include "math/m_matrix.h" |
| |
| |
| /** |
| * 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 GLAPIENTRY |
| _mesa_ClipPlane( GLenum plane, const GLdouble *eq ) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| GLint p; |
| GLfloat equation[4]; |
| |
| 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); |
| |
| if (ctx->Transform.ClipPlanesEnabled & (1 << p)) { |
| _mesa_update_clip_plane(ctx, p); |
| } |
| |
| if (ctx->Driver.ClipPlane) |
| ctx->Driver.ClipPlane( ctx, plane, equation ); |
| } |
| |
| |
| void GLAPIENTRY |
| _mesa_GetClipPlane( GLenum plane, GLdouble *equation ) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| GLint p; |
| |
| 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]; |
| } |