2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2007 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.
28 * glClearColor, glClearIndex, glClear() functions.
43 _mesa_ClearIndex( GLfloat c
)
45 GET_CURRENT_CONTEXT(ctx
);
46 ASSERT_OUTSIDE_BEGIN_END(ctx
);
48 if (ctx
->Color
.ClearIndex
== (GLuint
) c
)
51 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
52 ctx
->Color
.ClearIndex
= (GLuint
) c
;
54 if (!ctx
->Visual
.rgbMode
&& ctx
->Driver
.ClearIndex
) {
55 /* it's OK to call glClearIndex in RGBA mode but it should be a NOP */
56 (*ctx
->Driver
.ClearIndex
)( ctx
, ctx
->Color
.ClearIndex
);
63 * Specify the clear values for the color buffers.
65 * \param red red color component.
66 * \param green green color component.
67 * \param blue blue color component.
68 * \param alpha alpha component.
72 * Clamps the parameters and updates gl_colorbuffer_attrib::ClearColor. On a
73 * change, flushes the vertices and notifies the driver via the
74 * dd_function_table::ClearColor callback.
77 _mesa_ClearColor( GLclampf red
, GLclampf green
, GLclampf blue
, GLclampf alpha
)
80 GET_CURRENT_CONTEXT(ctx
);
81 ASSERT_OUTSIDE_BEGIN_END(ctx
);
83 tmp
[0] = CLAMP(red
, 0.0F
, 1.0F
);
84 tmp
[1] = CLAMP(green
, 0.0F
, 1.0F
);
85 tmp
[2] = CLAMP(blue
, 0.0F
, 1.0F
);
86 tmp
[3] = CLAMP(alpha
, 0.0F
, 1.0F
);
88 if (TEST_EQ_4V(tmp
, ctx
->Color
.ClearColor
))
89 return; /* no change */
91 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
92 COPY_4V(ctx
->Color
.ClearColor
, tmp
);
94 if (ctx
->Visual
.rgbMode
&& ctx
->Driver
.ClearColor
) {
95 /* it's OK to call glClearColor in CI mode but it should be a NOP */
96 (*ctx
->Driver
.ClearColor
)(ctx
, ctx
->Color
.ClearColor
);
104 * \param mask bit-mask indicating the buffers to be cleared.
106 * Flushes the vertices and verifies the parameter. If __GLcontextRec::NewState
107 * is set then calls _mesa_update_state() to update gl_frame_buffer::_Xmin,
108 * etc. If the rasterization mode is set to GL_RENDER then requests the driver
109 * to clear the buffers, via the dd_function_table::Clear callback.
112 _mesa_Clear( GLbitfield mask
)
114 GET_CURRENT_CONTEXT(ctx
);
115 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
117 FLUSH_CURRENT(ctx
, 0);
119 if (MESA_VERBOSE
& VERBOSE_API
)
120 _mesa_debug(ctx
, "glClear 0x%x\n", mask
);
122 if (mask
& ~(GL_COLOR_BUFFER_BIT
|
123 GL_DEPTH_BUFFER_BIT
|
124 GL_STENCIL_BUFFER_BIT
|
125 GL_ACCUM_BUFFER_BIT
)) {
126 /* invalid bit set */
127 _mesa_error( ctx
, GL_INVALID_VALUE
, "glClear(0x%x)", mask
);
132 _mesa_update_state( ctx
); /* update _Xmin, etc */
135 if (ctx
->DrawBuffer
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
136 _mesa_error(ctx
, GL_INVALID_FRAMEBUFFER_OPERATION_EXT
,
137 "glClear(incomplete framebuffer)");
141 if (ctx
->DrawBuffer
->Width
== 0 || ctx
->DrawBuffer
->Height
== 0 ||
142 ctx
->DrawBuffer
->_Xmin
>= ctx
->DrawBuffer
->_Xmax
||
143 ctx
->DrawBuffer
->_Ymin
>= ctx
->DrawBuffer
->_Ymax
)
146 if (ctx
->RenderMode
== GL_RENDER
) {
147 GLbitfield bufferMask
;
149 /* don't clear depth buffer if depth writing disabled */
150 if (!ctx
->Depth
.Mask
)
151 mask
&= ~GL_DEPTH_BUFFER_BIT
;
153 /* Build the bitmask to send to device driver's Clear function.
154 * Note that the GL_COLOR_BUFFER_BIT flag will expand to 0, 1, 2 or 4
155 * of the BUFFER_BIT_FRONT/BACK_LEFT/RIGHT flags, or one of the
156 * BUFFER_BIT_COLORn flags.
159 if (mask
& GL_COLOR_BUFFER_BIT
) {
161 for (i
= 0; i
< ctx
->DrawBuffer
->_NumColorDrawBuffers
; i
++) {
162 bufferMask
|= (1 << ctx
->DrawBuffer
->_ColorDrawBufferIndexes
[i
]);
166 if ((mask
& GL_DEPTH_BUFFER_BIT
)
167 && ctx
->DrawBuffer
->Visual
.haveDepthBuffer
) {
168 bufferMask
|= BUFFER_BIT_DEPTH
;
171 if ((mask
& GL_STENCIL_BUFFER_BIT
)
172 && ctx
->DrawBuffer
->Visual
.haveStencilBuffer
) {
173 bufferMask
|= BUFFER_BIT_STENCIL
;
176 if ((mask
& GL_ACCUM_BUFFER_BIT
)
177 && ctx
->DrawBuffer
->Visual
.haveAccumBuffer
) {
178 bufferMask
|= BUFFER_BIT_ACCUM
;
181 ASSERT(ctx
->Driver
.Clear
);
182 ctx
->Driver
.Clear(ctx
, bufferMask
);