1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
|
/*
* Mesa 3-D graphics library
* Version: 7.5
*
* Copyright (C) 2009 VMware, Inc. 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.
*/
/**
* \file viewport.c
* glViewport and glDepthRange functions.
*/
#include "context.h"
#include "macros.h"
#include "mtypes.h"
#include "viewport.h"
/**
* Set the viewport.
* \sa Called via glViewport() or display list execution.
*
* Flushes the vertices and calls _mesa_set_viewport() with the given
* parameters.
*/
void GLAPIENTRY
_mesa_Viewport(GLint x, GLint y, GLsizei width, GLsizei height)
{
GET_CURRENT_CONTEXT(ctx);
FLUSH_VERTICES(ctx, 0);
_mesa_set_viewport(ctx, x, y, width, height);
}
/**
* Set new viewport parameters and update derived state (the _WindowMap
* matrix). Usually called from _mesa_Viewport().
*
* \param ctx GL context.
* \param x, y coordinates of the lower left corner of the viewport rectangle.
* \param width width of the viewport rectangle.
* \param height height of the viewport rectangle.
*/
void
_mesa_set_viewport(struct gl_context *ctx, GLint x, GLint y,
GLsizei width, GLsizei height)
{
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glViewport %d %d %d %d\n", x, y, width, height);
if (width < 0 || height < 0) {
_mesa_error(ctx, GL_INVALID_VALUE,
"glViewport(%d, %d, %d, %d)", x, y, width, height);
return;
}
/* clamp width and height to the implementation dependent range */
width = MIN2(width, (GLsizei) ctx->Const.MaxViewportWidth);
height = MIN2(height, (GLsizei) ctx->Const.MaxViewportHeight);
ctx->Viewport.X = x;
ctx->Viewport.Width = width;
ctx->Viewport.Y = y;
ctx->Viewport.Height = height;
ctx->NewState |= _NEW_VIEWPORT;
#if 1
/* XXX remove this someday. Currently the DRI drivers rely on
* the WindowMap matrix being up to date in the driver's Viewport
* and DepthRange functions.
*/
_math_matrix_viewport(&ctx->Viewport._WindowMap,
ctx->Viewport.X, ctx->Viewport.Y,
ctx->Viewport.Width, ctx->Viewport.Height,
ctx->Viewport.Near, ctx->Viewport.Far,
ctx->DrawBuffer->_DepthMaxF);
#endif
if (ctx->Driver.Viewport) {
/* Many drivers will use this call to check for window size changes
* and reallocate the z/stencil/accum/etc buffers if needed.
*/
ctx->Driver.Viewport(ctx, x, y, width, height);
}
}
/**
* Called by glDepthRange
*
* \param nearval specifies the Z buffer value which should correspond to
* the near clip plane
* \param farval specifies the Z buffer value which should correspond to
* the far clip plane
*/
void GLAPIENTRY
_mesa_DepthRange(GLclampd nearval, GLclampd farval)
{
GET_CURRENT_CONTEXT(ctx);
FLUSH_VERTICES(ctx, 0);
if (MESA_VERBOSE&VERBOSE_API)
_mesa_debug(ctx, "glDepthRange %f %f\n", nearval, farval);
if (ctx->Viewport.Near == nearval &&
ctx->Viewport.Far == farval)
return;
ctx->Viewport.Near = (GLfloat) CLAMP(nearval, 0.0, 1.0);
ctx->Viewport.Far = (GLfloat) CLAMP(farval, 0.0, 1.0);
ctx->NewState |= _NEW_VIEWPORT;
#if 1
/* XXX remove this someday. Currently the DRI drivers rely on
* the WindowMap matrix being up to date in the driver's Viewport
* and DepthRange functions.
*/
_math_matrix_viewport(&ctx->Viewport._WindowMap,
ctx->Viewport.X, ctx->Viewport.Y,
ctx->Viewport.Width, ctx->Viewport.Height,
ctx->Viewport.Near, ctx->Viewport.Far,
ctx->DrawBuffer->_DepthMaxF);
#endif
if (ctx->Driver.DepthRange) {
ctx->Driver.DepthRange(ctx, nearval, farval);
}
}
void GLAPIENTRY
_mesa_DepthRangef(GLclampf nearval, GLclampf farval)
{
_mesa_DepthRange(nearval, farval);
}
/**
* Initialize the context viewport attribute group.
* \param ctx the GL context.
*/
void _mesa_init_viewport(struct gl_context *ctx)
{
GLfloat depthMax = 65535.0F; /* sorf of arbitrary */
/* Viewport group */
ctx->Viewport.X = 0;
ctx->Viewport.Y = 0;
ctx->Viewport.Width = 0;
ctx->Viewport.Height = 0;
ctx->Viewport.Near = 0.0;
ctx->Viewport.Far = 1.0;
_math_matrix_ctr(&ctx->Viewport._WindowMap);
_math_matrix_viewport(&ctx->Viewport._WindowMap, 0, 0, 0, 0,
0.0F, 1.0F, depthMax);
}
/**
* Free the context viewport attribute group data.
* \param ctx the GL context.
*/
void _mesa_free_viewport_data(struct gl_context *ctx)
{
_math_matrix_dtr(&ctx->Viewport._WindowMap);
}
|
