ReactOS
0.4.16-dev-226-g79f2289
scissor.c
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/* $Id: scissor.c,v 1.6 1997/11/25 03:38:58 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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* Version: 2.5
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* Copyright (C) 1995-1997 Brian Paul
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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* $Log: scissor.c,v $
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* Revision 1.6 1997/11/25 03:38:58 brianp
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* small optimization to gl_Scissor() (Daryll Strauss)
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*
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* Revision 1.5 1997/07/24 01:21:56 brianp
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* changed precompiled header symbol from PCH to PC_HEADER
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*
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* Revision 1.4 1997/05/28 03:26:29 brianp
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* added precompiled header (PCH) support
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*
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* Revision 1.3 1997/05/17 03:17:50 brianp
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* faster gl_scissor_span() from Mats Lofkvist
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*
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* Revision 1.2 1996/09/15 14:18:37 brianp
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* now use GLframebuffer and GLvisual
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*
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* Revision 1.1 1996/09/13 01:38:16 brianp
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* Initial revision
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*
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*/
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#ifdef PC_HEADER
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#include "
all.h
"
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#else
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#include "
context.h
"
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#include "
macros.h
"
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#include "
dlist.h
"
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#include "
scissor.h
"
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#include "
types.h
"
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#endif
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void
gl_Scissor
(
GLcontext
*
ctx
,
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GLint
x
,
GLint
y
,
GLsizei
width
,
GLsizei
height
)
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{
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if
(
width
<0 ||
height
<0) {
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gl_error
(
ctx
,
GL_INVALID_VALUE
,
"glScissor"
);
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return
;
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}
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if
(
INSIDE_BEGIN_END
(
ctx
)) {
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gl_error
(
ctx
,
GL_INVALID_OPERATION
,
"glBegin"
);
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return
;
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}
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if
(
x
!=
ctx
->Scissor.X ||
y
!=
ctx
->Scissor.Y ||
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width
!=
ctx
->Scissor.Width ||
height
!=
ctx
->Scissor.Height) {
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ctx
->Scissor.X =
x
;
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ctx
->Scissor.Y =
y
;
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ctx
->Scissor.Width =
width
;
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ctx
->Scissor.Height =
height
;
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ctx
->NewState |=
NEW_ALL
;
/* TODO: this is overkill */
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}
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}
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/*
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* Apply the scissor test to a span of pixels.
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* Return: 0 = all pixels in the span are outside the scissor box.
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* 1 = one or more pixels passed the scissor test.
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*/
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GLint
gl_scissor_span
(
GLcontext
*
ctx
,
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GLuint
n
,
GLint
x
,
GLint
y
,
GLubyte
mask
[] )
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{
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/* first check if whole span is outside the scissor box */
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if
(
y<ctx->
Buffer
->Ymin ||
y
>
ctx
->Buffer->Ymax
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||
x
>
ctx
->Buffer->Xmax ||
x
+(
GLint
)
n
-1<
ctx
->Buffer->Xmin) {
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return
0;
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}
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else
{
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GLint
i
;
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GLint
xMin =
ctx
->Buffer->Xmin;
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GLint
xMax =
ctx
->Buffer->Xmax;
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for
(
i
=0;
x
+
i
< xMin;
i
++) {
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mask
[
i
] = 0;
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}
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for
(
i
=(
GLint
)
n
-1;
x
+
i
> xMax;
i
--) {
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mask
[
i
] = 0;
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}
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return
1;
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}
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}
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/*
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* Apply the scissor test to an array of pixels.
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*/
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GLuint
gl_scissor_pixels
(
GLcontext
*
ctx
,
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GLuint
n
,
const
GLint
x
[],
const
GLint
y
[],
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GLubyte
mask
[] )
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{
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GLint
xmin =
ctx
->Buffer->Xmin;
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GLint
xmax =
ctx
->Buffer->Xmax;
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GLint
ymin =
ctx
->Buffer->Ymin;
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GLint
ymax =
ctx
->Buffer->Ymax;
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GLuint
i
;
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for
(
i
=0;
i
<
n
;
i
++) {
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mask
[
i
] &= (
x
[
i
]>=xmin) & (
x
[
i
]<=xmax) & (
y
[
i
]>=ymin) & (
y
[
i
]<=ymax);
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}
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return
1;
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}
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all.h
Buffer
Definition:
bufpool.h:45
context.h
gl_error
void gl_error(GLcontext *ctx, GLenum error, const char *s)
Definition:
context.c:1421
NEW_ALL
#define NEW_ALL
Definition:
types.h:1236
GLubyte
unsigned char GLubyte
Definition:
gl.h:157
GL_INVALID_VALUE
#define GL_INVALID_VALUE
Definition:
gl.h:695
x
GLint GLint GLint GLint GLint x
Definition:
gl.h:1548
GL_INVALID_OPERATION
#define GL_INVALID_OPERATION
Definition:
gl.h:696
GLuint
unsigned int GLuint
Definition:
gl.h:159
y
GLint GLint GLint GLint GLint GLint y
Definition:
gl.h:1548
height
GLint GLint GLsizei GLsizei height
Definition:
gl.h:1546
GLsizei
int GLsizei
Definition:
gl.h:160
GLint
int GLint
Definition:
gl.h:156
width
GLint GLint GLsizei width
Definition:
gl.h:1546
n
GLdouble n
Definition:
glext.h:7729
mask
GLenum GLint GLuint mask
Definition:
glext.h:6028
i
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition:
glfuncs.h:248
macros.h
INSIDE_BEGIN_END
#define INSIDE_BEGIN_END(CTX)
Definition:
macros.h:135
gl_scissor_pixels
GLuint gl_scissor_pixels(GLcontext *ctx, GLuint n, const GLint x[], const GLint y[], GLubyte mask[])
Definition:
scissor.c:116
gl_scissor_span
GLint gl_scissor_span(GLcontext *ctx, GLuint n, GLint x, GLint y, GLubyte mask[])
Definition:
scissor.c:87
gl_Scissor
void gl_Scissor(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height)
Definition:
scissor.c:58
scissor.h
dlist.h
types.h
gl_context
Definition:
types.h:1263
ctx
Definition:
dbghelp_private.h:571
dll
opengl
mesa
scissor.c
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