2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 #include "main/glheader.h"
26 #include "main/colormac.h"
27 #include "main/condrender.h"
28 #include "main/macros.h"
29 #include "main/imports.h"
30 #include "main/mtypes.h"
33 #include "s_context.h"
35 #include "s_masking.h"
36 #include "s_stencil.h"
40 * Clear the color buffer when glColorMask is in effect.
43 clear_rgba_buffer_with_masking(GLcontext
*ctx
, struct gl_renderbuffer
*rb
,
46 const GLint x
= ctx
->DrawBuffer
->_Xmin
;
47 const GLint y
= ctx
->DrawBuffer
->_Ymin
;
48 const GLint height
= ctx
->DrawBuffer
->_Ymax
- ctx
->DrawBuffer
->_Ymin
;
49 const GLint width
= ctx
->DrawBuffer
->_Xmax
- ctx
->DrawBuffer
->_Xmin
;
55 /* Initialize color span with clear color */
56 /* XXX optimize for clearcolor == black/zero (bzero) */
57 INIT_SPAN(span
, GL_BITMAP
);
59 span
.arrayMask
= SPAN_RGBA
;
60 span
.array
->ChanType
= rb
->DataType
;
61 if (span
.array
->ChanType
== GL_UNSIGNED_BYTE
) {
62 GLubyte clearColor
[4];
63 UNCLAMPED_FLOAT_TO_UBYTE(clearColor
[RCOMP
], ctx
->Color
.ClearColor
[0]);
64 UNCLAMPED_FLOAT_TO_UBYTE(clearColor
[GCOMP
], ctx
->Color
.ClearColor
[1]);
65 UNCLAMPED_FLOAT_TO_UBYTE(clearColor
[BCOMP
], ctx
->Color
.ClearColor
[2]);
66 UNCLAMPED_FLOAT_TO_UBYTE(clearColor
[ACOMP
], ctx
->Color
.ClearColor
[3]);
67 for (i
= 0; i
< width
; i
++) {
68 COPY_4UBV(span
.array
->rgba
[i
], clearColor
);
71 else if (span
.array
->ChanType
== GL_UNSIGNED_SHORT
) {
72 GLushort clearColor
[4];
73 UNCLAMPED_FLOAT_TO_USHORT(clearColor
[RCOMP
], ctx
->Color
.ClearColor
[0]);
74 UNCLAMPED_FLOAT_TO_USHORT(clearColor
[GCOMP
], ctx
->Color
.ClearColor
[1]);
75 UNCLAMPED_FLOAT_TO_USHORT(clearColor
[BCOMP
], ctx
->Color
.ClearColor
[2]);
76 UNCLAMPED_FLOAT_TO_USHORT(clearColor
[ACOMP
], ctx
->Color
.ClearColor
[3]);
77 for (i
= 0; i
< width
; i
++) {
78 COPY_4V_CAST(span
.array
->rgba
[i
], clearColor
, GLchan
);
82 ASSERT(span
.array
->ChanType
== GL_FLOAT
);
83 for (i
= 0; i
< width
; i
++) {
84 CLAMPED_FLOAT_TO_CHAN(span
.array
->rgba
[i
][0], ctx
->Color
.ClearColor
[0]);
85 CLAMPED_FLOAT_TO_CHAN(span
.array
->rgba
[i
][1], ctx
->Color
.ClearColor
[1]);
86 CLAMPED_FLOAT_TO_CHAN(span
.array
->rgba
[i
][2], ctx
->Color
.ClearColor
[2]);
87 CLAMPED_FLOAT_TO_CHAN(span
.array
->rgba
[i
][3], ctx
->Color
.ClearColor
[3]);
91 /* Note that masking will change the color values, but only the
92 * channels for which the write mask is GL_FALSE. The channels
93 * which which are write-enabled won't get modified.
95 for (i
= 0; i
< height
; i
++) {
98 _swrast_mask_rgba_span(ctx
, rb
, &span
, buf
);
99 /* write masked row */
100 rb
->PutRow(ctx
, rb
, width
, x
, y
+ i
, span
.array
->rgba
, NULL
);
106 * Clear an rgba color buffer without channel masking.
109 clear_rgba_buffer(GLcontext
*ctx
, struct gl_renderbuffer
*rb
, GLuint buf
)
111 const GLint x
= ctx
->DrawBuffer
->_Xmin
;
112 const GLint y
= ctx
->DrawBuffer
->_Ymin
;
113 const GLint height
= ctx
->DrawBuffer
->_Ymax
- ctx
->DrawBuffer
->_Ymin
;
114 const GLint width
= ctx
->DrawBuffer
->_Xmax
- ctx
->DrawBuffer
->_Xmin
;
120 ASSERT(ctx
->Color
.ColorMask
[buf
][0] &&
121 ctx
->Color
.ColorMask
[buf
][1] &&
122 ctx
->Color
.ColorMask
[buf
][2] &&
123 ctx
->Color
.ColorMask
[buf
][3]);
125 ASSERT(rb
->PutMonoRow
);
127 switch (rb
->DataType
) {
128 case GL_UNSIGNED_BYTE
:
129 UNCLAMPED_FLOAT_TO_UBYTE(clear8
[0], ctx
->Color
.ClearColor
[0]);
130 UNCLAMPED_FLOAT_TO_UBYTE(clear8
[1], ctx
->Color
.ClearColor
[1]);
131 UNCLAMPED_FLOAT_TO_UBYTE(clear8
[2], ctx
->Color
.ClearColor
[2]);
132 UNCLAMPED_FLOAT_TO_UBYTE(clear8
[3], ctx
->Color
.ClearColor
[3]);
135 case GL_UNSIGNED_SHORT
:
136 UNCLAMPED_FLOAT_TO_USHORT(clear16
[0], ctx
->Color
.ClearColor
[0]);
137 UNCLAMPED_FLOAT_TO_USHORT(clear16
[1], ctx
->Color
.ClearColor
[1]);
138 UNCLAMPED_FLOAT_TO_USHORT(clear16
[2], ctx
->Color
.ClearColor
[2]);
139 UNCLAMPED_FLOAT_TO_USHORT(clear16
[3], ctx
->Color
.ClearColor
[3]);
143 clearVal
= ctx
->Color
.ClearColor
;
146 _mesa_problem(ctx
, "Bad rb DataType in clear_color_buffer");
150 for (i
= 0; i
< height
; i
++) {
151 rb
->PutMonoRow(ctx
, rb
, width
, x
, y
+ i
, clearVal
, NULL
);
157 * Clear the front/back/left/right/aux color buffers.
158 * This function is usually only called if the device driver can't
159 * clear its own color buffers for some reason (such as with masking).
162 clear_color_buffers(GLcontext
*ctx
)
166 for (buf
= 0; buf
< ctx
->DrawBuffer
->_NumColorDrawBuffers
; buf
++) {
167 struct gl_renderbuffer
*rb
= ctx
->DrawBuffer
->_ColorDrawBuffers
[buf
];
168 if (ctx
->Color
.ColorMask
[buf
][0] == 0 ||
169 ctx
->Color
.ColorMask
[buf
][1] == 0 ||
170 ctx
->Color
.ColorMask
[buf
][2] == 0 ||
171 ctx
->Color
.ColorMask
[buf
][3] == 0) {
172 clear_rgba_buffer_with_masking(ctx
, rb
, buf
);
175 clear_rgba_buffer(ctx
, rb
, buf
);
182 * Called via the device driver's ctx->Driver.Clear() function if the
183 * device driver can't clear one or more of the buffers itself.
184 * \param buffers bitfield of BUFFER_BIT_* values indicating which
185 * renderbuffers are to be cleared.
186 * \param all if GL_TRUE, clear whole buffer, else clear specified region.
189 _swrast_Clear(GLcontext
*ctx
, GLbitfield buffers
)
193 const GLbitfield legalBits
=
194 BUFFER_BIT_FRONT_LEFT
|
195 BUFFER_BIT_FRONT_RIGHT
|
196 BUFFER_BIT_BACK_LEFT
|
197 BUFFER_BIT_BACK_RIGHT
|
202 assert((buffers
& (~legalBits
)) == 0);
206 if (!_mesa_check_conditional_render(ctx
))
207 return; /* don't clear */
209 swrast_render_start(ctx
);
211 /* do software clearing here */
213 if ((buffers
& BUFFER_BITS_COLOR
)
214 && (ctx
->DrawBuffer
->_NumColorDrawBuffers
> 0)) {
215 clear_color_buffers(ctx
);
217 if (buffers
& BUFFER_BIT_DEPTH
) {
218 _swrast_clear_depth_buffer(ctx
, ctx
->DrawBuffer
->_DepthBuffer
);
220 if (buffers
& BUFFER_BIT_ACCUM
) {
221 _swrast_clear_accum_buffer(ctx
,
222 ctx
->DrawBuffer
->Attachment
[BUFFER_ACCUM
].Renderbuffer
);
224 if (buffers
& BUFFER_BIT_STENCIL
) {
225 _swrast_clear_stencil_buffer(ctx
, ctx
->DrawBuffer
->_StencilBuffer
);
229 swrast_render_finish(ctx
);