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/formats.h"
29 #include "main/macros.h"
30 #include "main/imports.h"
31 #include "main/mtypes.h"
34 #include "s_context.h"
36 #include "s_masking.h"
37 #include "s_stencil.h"
41 * Clear the color buffer when glColorMask is in effect.
44 clear_rgba_buffer_with_masking(GLcontext
*ctx
, struct gl_renderbuffer
*rb
,
47 const GLint x
= ctx
->DrawBuffer
->_Xmin
;
48 const GLint y
= ctx
->DrawBuffer
->_Ymin
;
49 const GLint height
= ctx
->DrawBuffer
->_Ymax
- ctx
->DrawBuffer
->_Ymin
;
50 const GLint width
= ctx
->DrawBuffer
->_Xmax
- ctx
->DrawBuffer
->_Xmin
;
54 ASSERT(ctx
->Visual
.rgbMode
);
57 /* Initialize color span with clear color */
58 /* XXX optimize for clearcolor == black/zero (bzero) */
59 INIT_SPAN(span
, GL_BITMAP
);
61 span
.arrayMask
= SPAN_RGBA
;
62 span
.array
->ChanType
= rb
->DataType
;
63 if (span
.array
->ChanType
== GL_UNSIGNED_BYTE
) {
64 GLubyte clearColor
[4];
65 UNCLAMPED_FLOAT_TO_UBYTE(clearColor
[RCOMP
], ctx
->Color
.ClearColor
[0]);
66 UNCLAMPED_FLOAT_TO_UBYTE(clearColor
[GCOMP
], ctx
->Color
.ClearColor
[1]);
67 UNCLAMPED_FLOAT_TO_UBYTE(clearColor
[BCOMP
], ctx
->Color
.ClearColor
[2]);
68 UNCLAMPED_FLOAT_TO_UBYTE(clearColor
[ACOMP
], ctx
->Color
.ClearColor
[3]);
69 for (i
= 0; i
< width
; i
++) {
70 COPY_4UBV(span
.array
->rgba
[i
], clearColor
);
73 else if (span
.array
->ChanType
== GL_UNSIGNED_SHORT
) {
74 GLushort clearColor
[4];
75 UNCLAMPED_FLOAT_TO_USHORT(clearColor
[RCOMP
], ctx
->Color
.ClearColor
[0]);
76 UNCLAMPED_FLOAT_TO_USHORT(clearColor
[GCOMP
], ctx
->Color
.ClearColor
[1]);
77 UNCLAMPED_FLOAT_TO_USHORT(clearColor
[BCOMP
], ctx
->Color
.ClearColor
[2]);
78 UNCLAMPED_FLOAT_TO_USHORT(clearColor
[ACOMP
], ctx
->Color
.ClearColor
[3]);
79 for (i
= 0; i
< width
; i
++) {
80 COPY_4V(span
.array
->rgba
[i
], clearColor
);
84 ASSERT(span
.array
->ChanType
== GL_FLOAT
);
85 for (i
= 0; i
< width
; i
++) {
86 CLAMPED_FLOAT_TO_CHAN(span
.array
->rgba
[i
][0], ctx
->Color
.ClearColor
[0]);
87 CLAMPED_FLOAT_TO_CHAN(span
.array
->rgba
[i
][1], ctx
->Color
.ClearColor
[1]);
88 CLAMPED_FLOAT_TO_CHAN(span
.array
->rgba
[i
][2], ctx
->Color
.ClearColor
[2]);
89 CLAMPED_FLOAT_TO_CHAN(span
.array
->rgba
[i
][3], ctx
->Color
.ClearColor
[3]);
93 /* Note that masking will change the color values, but only the
94 * channels for which the write mask is GL_FALSE. The channels
95 * which which are write-enabled won't get modified.
97 for (i
= 0; i
< height
; i
++) {
100 _swrast_mask_rgba_span(ctx
, rb
, &span
, buf
);
101 /* write masked row */
102 rb
->PutRow(ctx
, rb
, width
, x
, y
+ i
, span
.array
->rgba
, NULL
);
108 * Clear color index buffer with masking.
111 clear_ci_buffer_with_masking(GLcontext
*ctx
, struct gl_renderbuffer
*rb
)
113 const GLint x
= ctx
->DrawBuffer
->_Xmin
;
114 const GLint y
= ctx
->DrawBuffer
->_Ymin
;
115 const GLint height
= ctx
->DrawBuffer
->_Ymax
- ctx
->DrawBuffer
->_Ymin
;
116 const GLint width
= ctx
->DrawBuffer
->_Xmax
- ctx
->DrawBuffer
->_Xmin
;
120 ASSERT(!ctx
->Visual
.rgbMode
);
122 ASSERT(rb
->DataType
== GL_UNSIGNED_INT
);
124 /* Initialize index span with clear index */
125 INIT_SPAN(span
, GL_BITMAP
);
127 span
.arrayMask
= SPAN_INDEX
;
128 for (i
= 0; i
< width
;i
++) {
129 span
.array
->index
[i
] = ctx
->Color
.ClearIndex
;
132 /* Note that masking will change the color indexes, but only the
133 * bits for which the write mask is GL_FALSE. The bits
134 * which are write-enabled won't get modified.
136 for (i
= 0; i
< height
;i
++) {
139 _swrast_mask_ci_span(ctx
, rb
, &span
);
140 /* write masked row */
141 rb
->PutRow(ctx
, rb
, width
, x
, y
+ i
, span
.array
->index
, NULL
);
147 * Clear an rgba color buffer without channel masking.
150 clear_rgba_buffer(GLcontext
*ctx
, struct gl_renderbuffer
*rb
, GLuint buf
)
152 const GLint x
= ctx
->DrawBuffer
->_Xmin
;
153 const GLint y
= ctx
->DrawBuffer
->_Ymin
;
154 const GLint height
= ctx
->DrawBuffer
->_Ymax
- ctx
->DrawBuffer
->_Ymin
;
155 const GLint width
= ctx
->DrawBuffer
->_Xmax
- ctx
->DrawBuffer
->_Xmin
;
161 ASSERT(ctx
->Visual
.rgbMode
);
163 ASSERT(ctx
->Color
.ColorMask
[buf
][0] &&
164 ctx
->Color
.ColorMask
[buf
][1] &&
165 ctx
->Color
.ColorMask
[buf
][2] &&
166 ctx
->Color
.ColorMask
[buf
][3]);
168 ASSERT(rb
->PutMonoRow
);
170 switch (rb
->DataType
) {
171 case GL_UNSIGNED_BYTE
:
172 UNCLAMPED_FLOAT_TO_UBYTE(clear8
[0], ctx
->Color
.ClearColor
[0]);
173 UNCLAMPED_FLOAT_TO_UBYTE(clear8
[1], ctx
->Color
.ClearColor
[1]);
174 UNCLAMPED_FLOAT_TO_UBYTE(clear8
[2], ctx
->Color
.ClearColor
[2]);
175 UNCLAMPED_FLOAT_TO_UBYTE(clear8
[3], ctx
->Color
.ClearColor
[3]);
178 case GL_UNSIGNED_SHORT
:
179 UNCLAMPED_FLOAT_TO_USHORT(clear16
[0], ctx
->Color
.ClearColor
[0]);
180 UNCLAMPED_FLOAT_TO_USHORT(clear16
[1], ctx
->Color
.ClearColor
[1]);
181 UNCLAMPED_FLOAT_TO_USHORT(clear16
[2], ctx
->Color
.ClearColor
[2]);
182 UNCLAMPED_FLOAT_TO_USHORT(clear16
[3], ctx
->Color
.ClearColor
[3]);
186 clearVal
= ctx
->Color
.ClearColor
;
189 _mesa_problem(ctx
, "Bad rb DataType in clear_color_buffer");
193 for (i
= 0; i
< height
; i
++) {
194 rb
->PutMonoRow(ctx
, rb
, width
, x
, y
+ i
, clearVal
, NULL
);
200 * Clear color index buffer without masking.
203 clear_ci_buffer(GLcontext
*ctx
, struct gl_renderbuffer
*rb
)
205 const GLint x
= ctx
->DrawBuffer
->_Xmin
;
206 const GLint y
= ctx
->DrawBuffer
->_Ymin
;
207 const GLint height
= ctx
->DrawBuffer
->_Ymax
- ctx
->DrawBuffer
->_Ymin
;
208 const GLint width
= ctx
->DrawBuffer
->_Xmax
- ctx
->DrawBuffer
->_Xmin
;
215 ASSERT(!ctx
->Visual
.rgbMode
);
217 ASSERT(rb
->PutMonoRow
);
219 /* setup clear value */
220 switch (rb
->DataType
) {
221 case GL_UNSIGNED_BYTE
:
222 clear8
= (GLubyte
) ctx
->Color
.ClearIndex
;
225 case GL_UNSIGNED_SHORT
:
226 clear16
= (GLushort
) ctx
->Color
.ClearIndex
;
229 case GL_UNSIGNED_INT
:
230 clear32
= ctx
->Color
.ClearIndex
;
234 _mesa_problem(ctx
, "Bad rb DataType in clear_color_buffer");
238 for (i
= 0; i
< height
; i
++)
239 rb
->PutMonoRow(ctx
, rb
, width
, x
, y
+ i
, clearVal
, NULL
);
244 * Clear the front/back/left/right/aux color buffers.
245 * This function is usually only called if the device driver can't
246 * clear its own color buffers for some reason (such as with masking).
249 clear_color_buffers(GLcontext
*ctx
)
253 for (buf
= 0; buf
< ctx
->DrawBuffer
->_NumColorDrawBuffers
; buf
++) {
254 struct gl_renderbuffer
*rb
= ctx
->DrawBuffer
->_ColorDrawBuffers
[buf
];
255 if (ctx
->Visual
.rgbMode
) {
256 if (ctx
->Color
.ColorMask
[buf
][0] == 0 ||
257 ctx
->Color
.ColorMask
[buf
][1] == 0 ||
258 ctx
->Color
.ColorMask
[buf
][2] == 0 ||
259 ctx
->Color
.ColorMask
[buf
][3] == 0) {
260 clear_rgba_buffer_with_masking(ctx
, rb
, buf
);
263 clear_rgba_buffer(ctx
, rb
, buf
);
267 const GLuint indexMask
= (1 << _mesa_get_format_bits(rb
->Format
, GL_INDEX_BITS
)) - 1;
268 if ((ctx
->Color
.IndexMask
& indexMask
) != indexMask
) {
269 clear_ci_buffer_with_masking(ctx
, rb
);
272 clear_ci_buffer(ctx
, rb
);
280 * Called via the device driver's ctx->Driver.Clear() function if the
281 * device driver can't clear one or more of the buffers itself.
282 * \param buffers bitfield of BUFFER_BIT_* values indicating which
283 * renderbuffers are to be cleared.
284 * \param all if GL_TRUE, clear whole buffer, else clear specified region.
287 _swrast_Clear(GLcontext
*ctx
, GLbitfield buffers
)
291 const GLbitfield legalBits
=
292 BUFFER_BIT_FRONT_LEFT
|
293 BUFFER_BIT_FRONT_RIGHT
|
294 BUFFER_BIT_BACK_LEFT
|
295 BUFFER_BIT_BACK_RIGHT
|
300 assert((buffers
& (~legalBits
)) == 0);
304 if (!_mesa_check_conditional_render(ctx
))
305 return; /* don't clear */
307 swrast_render_start(ctx
);
309 /* do software clearing here */
311 if ((buffers
& BUFFER_BITS_COLOR
)
312 && (ctx
->DrawBuffer
->_NumColorDrawBuffers
> 0)) {
313 clear_color_buffers(ctx
);
315 if (buffers
& BUFFER_BIT_DEPTH
) {
316 _swrast_clear_depth_buffer(ctx
, ctx
->DrawBuffer
->_DepthBuffer
);
318 if (buffers
& BUFFER_BIT_ACCUM
) {
319 _swrast_clear_accum_buffer(ctx
,
320 ctx
->DrawBuffer
->Attachment
[BUFFER_ACCUM
].Renderbuffer
);
322 if (buffers
& BUFFER_BIT_STENCIL
) {
323 _swrast_clear_stencil_buffer(ctx
, ctx
->DrawBuffer
->_StencilBuffer
);
327 swrast_render_finish(ctx
);