2 * Mesa 3-D graphics library
4 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
26 #include "main/glheader.h"
27 #include "main/context.h"
28 #include "main/macros.h"
29 #include "main/multisample.h"
30 #include "main/mtypes.h"
31 #include "main/fbobject.h"
32 #include "main/glformats.h"
33 #include "main/state.h"
37 * Called via glSampleCoverageARB
40 _mesa_SampleCoverage(GLclampf value
, GLboolean invert
)
42 GET_CURRENT_CONTEXT(ctx
);
44 FLUSH_VERTICES(ctx
, 0);
46 ctx
->Multisample
.SampleCoverageValue
= CLAMP(value
, 0.0f
, 1.0f
);
47 ctx
->Multisample
.SampleCoverageInvert
= invert
;
48 ctx
->NewState
|= _NEW_MULTISAMPLE
;
53 * Initialize the context's multisample state.
54 * \param ctx the GL context.
57 _mesa_init_multisample(struct gl_context
*ctx
)
59 ctx
->Multisample
.Enabled
= GL_TRUE
;
60 ctx
->Multisample
.SampleAlphaToCoverage
= GL_FALSE
;
61 ctx
->Multisample
.SampleAlphaToOne
= GL_FALSE
;
62 ctx
->Multisample
.SampleCoverage
= GL_FALSE
;
63 ctx
->Multisample
.SampleCoverageValue
= 1.0;
64 ctx
->Multisample
.SampleCoverageInvert
= GL_FALSE
;
66 /* ARB_texture_multisample / GL3.2 additions */
67 ctx
->Multisample
.SampleMask
= GL_FALSE
;
68 ctx
->Multisample
.SampleMaskValue
= ~(GLbitfield
)0;
73 _mesa_GetMultisamplefv(GLenum pname
, GLuint index
, GLfloat
* val
)
75 GET_CURRENT_CONTEXT(ctx
);
77 if (ctx
->NewState
& _NEW_BUFFERS
) {
78 _mesa_update_state(ctx
);
82 case GL_SAMPLE_POSITION
: {
83 if ((int) index
>= ctx
->DrawBuffer
->Visual
.samples
) {
84 _mesa_error( ctx
, GL_INVALID_VALUE
, "glGetMultisamplefv(index)" );
88 ctx
->Driver
.GetSamplePosition(ctx
, ctx
->DrawBuffer
, index
, val
);
90 /* winsys FBOs are upside down */
91 if (_mesa_is_winsys_fbo(ctx
->DrawBuffer
))
92 val
[1] = 1.0f
- val
[1];
98 _mesa_error( ctx
, GL_INVALID_ENUM
, "glGetMultisamplefv(pname)" );
104 _mesa_SampleMaski(GLuint index
, GLbitfield mask
)
106 GET_CURRENT_CONTEXT(ctx
);
108 if (!ctx
->Extensions
.ARB_texture_multisample
) {
109 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glSampleMaski");
114 _mesa_error(ctx
, GL_INVALID_VALUE
, "glSampleMaski(index)");
118 FLUSH_VERTICES(ctx
, _NEW_MULTISAMPLE
);
119 ctx
->Multisample
.SampleMaskValue
= mask
;
123 * Called via glMinSampleShadingARB
126 _mesa_MinSampleShading(GLclampf value
)
128 GET_CURRENT_CONTEXT(ctx
);
130 if (!ctx
->Extensions
.ARB_sample_shading
|| !_mesa_is_desktop_gl(ctx
)) {
131 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glMinSampleShading");
135 FLUSH_VERTICES(ctx
, 0);
137 ctx
->Multisample
.MinSampleShadingValue
= CLAMP(value
, 0.0f
, 1.0f
);
138 ctx
->NewState
|= _NEW_MULTISAMPLE
;
142 * Helper for checking a requested sample count against the limit
143 * for a particular (target, internalFormat) pair. The limit imposed,
144 * and the error generated, both depend on which extensions are supported.
146 * Returns a GL error enum, or GL_NO_ERROR if the requested sample count is
150 _mesa_check_sample_count(struct gl_context
*ctx
, GLenum target
,
151 GLenum internalFormat
, GLsizei samples
)
153 /* Section 2.5 (GL Errors) of OpenGL 3.0 specification, page 16:
155 * "If a negative number is provided where an argument of type sizei or
156 * sizeiptr is specified, the error INVALID VALUE is generated."
159 return GL_INVALID_VALUE
;
162 /* Section 4.4 (Framebuffer objects), page 198 of the OpenGL ES 3.0.0
163 * specification says:
165 * "If internalformat is a signed or unsigned integer format and samples
166 * is greater than zero, then the error INVALID_OPERATION is generated."
168 if (_mesa_is_gles3(ctx
) && _mesa_is_enum_format_integer(internalFormat
)
170 return GL_INVALID_OPERATION
;
173 /* If ARB_internalformat_query is supported, then treat its highest
174 * returned sample count as the absolute maximum for this format; it is
175 * allowed to exceed MAX_SAMPLES.
177 * From the ARB_internalformat_query spec:
179 * "If <samples is greater than the maximum number of samples supported
180 * for <internalformat> then the error INVALID_OPERATION is generated."
182 if (ctx
->Extensions
.ARB_internalformat_query
) {
184 int count
= ctx
->Driver
.QuerySamplesForFormat(ctx
, target
,
185 internalFormat
, buffer
);
186 int limit
= count
? buffer
[0] : -1;
188 return samples
> limit
? GL_INVALID_OPERATION
: GL_NO_ERROR
;
191 /* If ARB_texture_multisample is supported, we have separate limits,
192 * which may be lower than MAX_SAMPLES:
194 * From the ARB_texture_multisample spec, when describing the operation
195 * of RenderbufferStorageMultisample:
197 * "If <internalformat> is a signed or unsigned integer format and
198 * <samples> is greater than the value of MAX_INTEGER_SAMPLES, then the
199 * error INVALID_OPERATION is generated"
201 * And when describing the operation of TexImage*Multisample:
203 * "The error INVALID_OPERATION may be generated if any of the following
206 * * <internalformat> is a depth/stencil-renderable format and <samples>
207 * is greater than the value of MAX_DEPTH_TEXTURE_SAMPLES
208 * * <internalformat> is a color-renderable format and <samples> is
209 * grater than the value of MAX_COLOR_TEXTURE_SAMPLES
210 * * <internalformat> is a signed or unsigned integer format and
211 * <samples> is greater than the value of MAX_INTEGER_SAMPLES
214 if (ctx
->Extensions
.ARB_texture_multisample
) {
215 if (_mesa_is_enum_format_integer(internalFormat
))
216 return samples
> ctx
->Const
.MaxIntegerSamples
217 ? GL_INVALID_OPERATION
: GL_NO_ERROR
;
219 if (target
== GL_TEXTURE_2D_MULTISAMPLE
||
220 target
== GL_TEXTURE_2D_MULTISAMPLE_ARRAY
) {
222 if (_mesa_is_depth_or_stencil_format(internalFormat
))
223 return samples
> ctx
->Const
.MaxDepthTextureSamples
224 ? GL_INVALID_OPERATION
: GL_NO_ERROR
;
226 return samples
> ctx
->Const
.MaxColorTextureSamples
227 ? GL_INVALID_OPERATION
: GL_NO_ERROR
;
231 /* No more specific limit is available, so just use MAX_SAMPLES:
233 * On p205 of the GL3.1 spec:
235 * "... or if samples is greater than MAX_SAMPLES, then the error
236 * INVALID_VALUE is generated"
238 return (GLuint
) samples
> ctx
->Const
.MaxSamples
239 ? GL_INVALID_VALUE
: GL_NO_ERROR
;