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 value
= CLAMP(value
, 0.0f
, 1.0f
);
46 if (ctx
->Multisample
.SampleCoverageInvert
== invert
&&
47 ctx
->Multisample
.SampleCoverageValue
== value
)
50 FLUSH_VERTICES(ctx
, ctx
->DriverFlags
.NewSampleMask
? 0 : _NEW_MULTISAMPLE
);
51 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewSampleMask
;
52 ctx
->Multisample
.SampleCoverageValue
= value
;
53 ctx
->Multisample
.SampleCoverageInvert
= invert
;
58 * Initialize the context's multisample state.
59 * \param ctx the GL context.
62 _mesa_init_multisample(struct gl_context
*ctx
)
64 ctx
->Multisample
.Enabled
= GL_TRUE
;
65 ctx
->Multisample
.SampleAlphaToCoverage
= GL_FALSE
;
66 ctx
->Multisample
.SampleAlphaToOne
= GL_FALSE
;
67 ctx
->Multisample
.SampleCoverage
= GL_FALSE
;
68 ctx
->Multisample
.SampleCoverageValue
= 1.0;
69 ctx
->Multisample
.SampleCoverageInvert
= GL_FALSE
;
70 ctx
->Multisample
.SampleShading
= GL_FALSE
;
71 ctx
->Multisample
.MinSampleShadingValue
= 0.0f
;
73 /* ARB_texture_multisample / GL3.2 additions */
74 ctx
->Multisample
.SampleMask
= GL_FALSE
;
75 ctx
->Multisample
.SampleMaskValue
= ~(GLbitfield
)0;
80 _mesa_GetMultisamplefv(GLenum pname
, GLuint index
, GLfloat
* val
)
82 GET_CURRENT_CONTEXT(ctx
);
84 if (ctx
->NewState
& _NEW_BUFFERS
) {
85 _mesa_update_state(ctx
);
89 case GL_SAMPLE_POSITION
: {
90 if (index
>= ctx
->DrawBuffer
->Visual
.samples
) {
91 _mesa_error( ctx
, GL_INVALID_VALUE
, "glGetMultisamplefv(index)" );
95 ctx
->Driver
.GetSamplePosition(ctx
, ctx
->DrawBuffer
, index
, val
);
97 /* FBOs can be upside down (winsys always are)*/
98 if (ctx
->DrawBuffer
->FlipY
)
99 val
[1] = 1.0f
- val
[1];
104 case GL_PROGRAMMABLE_SAMPLE_LOCATION_ARB
:
105 if (!ctx
->Extensions
.ARB_sample_locations
) {
106 _mesa_error( ctx
, GL_INVALID_ENUM
, "glGetMultisamplefv(pname)" );
110 if (index
>= MAX_SAMPLE_LOCATION_TABLE_SIZE
* 2) {
111 _mesa_error( ctx
, GL_INVALID_VALUE
, "glGetMultisamplefv(index)" );
115 if (ctx
->DrawBuffer
->SampleLocationTable
)
116 *val
= ctx
->DrawBuffer
->SampleLocationTable
[index
];
123 _mesa_error( ctx
, GL_INVALID_ENUM
, "glGetMultisamplefv(pname)" );
129 sample_maski(struct gl_context
*ctx
, GLuint index
, GLbitfield mask
)
131 if (ctx
->Multisample
.SampleMaskValue
== mask
)
134 FLUSH_VERTICES(ctx
, ctx
->DriverFlags
.NewSampleMask
? 0 : _NEW_MULTISAMPLE
);
135 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewSampleMask
;
136 ctx
->Multisample
.SampleMaskValue
= mask
;
140 _mesa_SampleMaski_no_error(GLuint index
, GLbitfield mask
)
142 GET_CURRENT_CONTEXT(ctx
);
143 sample_maski(ctx
, index
, mask
);
147 _mesa_SampleMaski(GLuint index
, GLbitfield mask
)
149 GET_CURRENT_CONTEXT(ctx
);
151 if (!ctx
->Extensions
.ARB_texture_multisample
) {
152 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glSampleMaski");
157 _mesa_error(ctx
, GL_INVALID_VALUE
, "glSampleMaski(index)");
161 sample_maski(ctx
, index
, mask
);
165 min_sample_shading(struct gl_context
*ctx
, GLclampf value
)
167 value
= CLAMP(value
, 0.0f
, 1.0f
);
169 if (ctx
->Multisample
.MinSampleShadingValue
== value
)
173 ctx
->DriverFlags
.NewSampleShading
? 0 : _NEW_MULTISAMPLE
);
174 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewSampleShading
;
175 ctx
->Multisample
.MinSampleShadingValue
= value
;
179 * Called via glMinSampleShadingARB
182 _mesa_MinSampleShading_no_error(GLclampf value
)
184 GET_CURRENT_CONTEXT(ctx
);
185 min_sample_shading(ctx
, value
);
189 _mesa_MinSampleShading(GLclampf value
)
191 GET_CURRENT_CONTEXT(ctx
);
193 if (!_mesa_has_ARB_sample_shading(ctx
) &&
194 !_mesa_has_OES_sample_shading(ctx
)) {
195 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glMinSampleShading");
199 min_sample_shading(ctx
, value
);
203 * Helper for checking a requested sample count against the limit
204 * for a particular (target, internalFormat) pair. The limit imposed,
205 * and the error generated, both depend on which extensions are supported.
207 * Returns a GL error enum, or GL_NO_ERROR if the requested sample count is
211 _mesa_check_sample_count(struct gl_context
*ctx
, GLenum target
,
212 GLenum internalFormat
, GLsizei samples
,
213 GLsizei storageSamples
)
215 /* Section 4.4 (Framebuffer objects), page 198 of the OpenGL ES 3.0.0
216 * specification says:
218 * "If internalformat is a signed or unsigned integer format and samples
219 * is greater than zero, then the error INVALID_OPERATION is generated."
221 * This restriction is relaxed for OpenGL ES 3.1.
223 if ((ctx
->API
== API_OPENGLES2
&& ctx
->Version
== 30) &&
224 _mesa_is_enum_format_integer(internalFormat
)
226 return GL_INVALID_OPERATION
;
229 if (ctx
->Extensions
.AMD_framebuffer_multisample_advanced
&&
230 target
== GL_RENDERBUFFER
) {
231 if (!_mesa_is_depth_or_stencil_format(internalFormat
)) {
232 /* From the AMD_framebuffer_multisample_advanced spec:
234 * "An INVALID_OPERATION error is generated if <internalformat>
235 * is a color format and <storageSamples> is greater than
236 * the implementation-dependent limit MAX_COLOR_FRAMEBUFFER_-
237 * STORAGE_SAMPLES_AMD."
239 if (samples
> ctx
->Const
.MaxColorFramebufferSamples
)
240 return GL_INVALID_OPERATION
;
242 /* From the AMD_framebuffer_multisample_advanced spec:
244 * "An INVALID_OPERATION error is generated if <internalformat>
245 * is a color format and <storageSamples> is greater than
246 * the implementation-dependent limit MAX_COLOR_FRAMEBUFFER_-
247 * STORAGE_SAMPLES_AMD."
249 if (storageSamples
> ctx
->Const
.MaxColorFramebufferStorageSamples
)
250 return GL_INVALID_OPERATION
;
252 /* From the AMD_framebuffer_multisample_advanced spec:
254 * "An INVALID_OPERATION error is generated if <storageSamples> is
255 * greater than <samples>."
257 if (storageSamples
> samples
)
258 return GL_INVALID_OPERATION
;
260 /* Color renderbuffer sample counts are now fully validated
261 * according to AMD_framebuffer_multisample_advanced.
265 /* From the AMD_framebuffer_multisample_advanced spec:
267 * "An INVALID_OPERATION error is generated if <internalformat> is
268 * a depth or stencil format and <storageSamples> is not equal to
271 if (storageSamples
!= samples
)
272 return GL_INVALID_OPERATION
;
275 /* If the extension is unsupported, it's not possible to set
276 * storageSamples differently.
278 assert(samples
== storageSamples
);
281 /* If ARB_internalformat_query is supported, then treat its highest
282 * returned sample count as the absolute maximum for this format; it is
283 * allowed to exceed MAX_SAMPLES.
285 * From the ARB_internalformat_query spec:
287 * "If <samples is greater than the maximum number of samples supported
288 * for <internalformat> then the error INVALID_OPERATION is generated."
290 if (ctx
->Extensions
.ARB_internalformat_query
) {
291 GLint buffer
[16] = {-1};
294 ctx
->Driver
.QueryInternalFormat(ctx
, target
, internalFormat
,
296 /* since the query returns samples sorted in descending order,
297 * the first element is the greatest supported sample value.
301 return samples
> limit
? GL_INVALID_OPERATION
: GL_NO_ERROR
;
304 /* If ARB_texture_multisample is supported, we have separate limits,
305 * which may be lower than MAX_SAMPLES:
307 * From the ARB_texture_multisample spec, when describing the operation
308 * of RenderbufferStorageMultisample:
310 * "If <internalformat> is a signed or unsigned integer format and
311 * <samples> is greater than the value of MAX_INTEGER_SAMPLES, then the
312 * error INVALID_OPERATION is generated"
314 * And when describing the operation of TexImage*Multisample:
316 * "The error INVALID_OPERATION may be generated if any of the following
319 * * <internalformat> is a depth/stencil-renderable format and <samples>
320 * is greater than the value of MAX_DEPTH_TEXTURE_SAMPLES
321 * * <internalformat> is a color-renderable format and <samples> is
322 * grater than the value of MAX_COLOR_TEXTURE_SAMPLES
323 * * <internalformat> is a signed or unsigned integer format and
324 * <samples> is greater than the value of MAX_INTEGER_SAMPLES
327 if (ctx
->Extensions
.ARB_texture_multisample
) {
328 if (_mesa_is_enum_format_integer(internalFormat
))
329 return samples
> ctx
->Const
.MaxIntegerSamples
330 ? GL_INVALID_OPERATION
: GL_NO_ERROR
;
332 if (target
== GL_TEXTURE_2D_MULTISAMPLE
||
333 target
== GL_TEXTURE_2D_MULTISAMPLE_ARRAY
) {
335 if (_mesa_is_depth_or_stencil_format(internalFormat
))
336 return samples
> ctx
->Const
.MaxDepthTextureSamples
337 ? GL_INVALID_OPERATION
: GL_NO_ERROR
;
339 return samples
> ctx
->Const
.MaxColorTextureSamples
340 ? GL_INVALID_OPERATION
: GL_NO_ERROR
;
344 /* No more specific limit is available, so just use MAX_SAMPLES:
346 * On p205 of the GL3.1 spec:
348 * "... or if samples is greater than MAX_SAMPLES, then the error
349 * INVALID_VALUE is generated"
351 return (GLuint
) samples
> ctx
->Const
.MaxSamples
352 ? GL_INVALID_VALUE
: GL_NO_ERROR
;