src/mesa/main/formatquery.c

   1 /*
   2  * Copyright © 2012 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #include "mtypes.h"
  25 #include "context.h"
  26 #include "glformats.h"
  27 #include "macros.h"
  28 #include "mfeatures.h"
  29 #include "enums.h"
  30 #include "fbobject.h"
  31 #include "formatquery.h"
  32
  33 /* default implementation of QuerySamplesForFormat driverfunc, for
  34  * non-multisample-capable drivers. */
  35 size_t
  36 _mesa_query_samples_for_format(struct gl_context *ctx, GLenum target,
  37                                GLenum internalFormat, int samples[16])
  38 {
  39    (void) target;
  40    (void) internalFormat;
  41    (void) ctx;
  42
  43    samples[0] = 1;
  44    return 1;
  45 }
  46
  47
  48 void GLAPIENTRY
  49 _mesa_GetInternalformativ(GLenum target, GLenum internalformat, GLenum pname,
  50                           GLsizei bufSize, GLint *params)
  51 {
  52    GLint buffer[16];
  53    GLsizei count = 0;
  54    GET_CURRENT_CONTEXT(ctx);
  55
  56    ASSERT_OUTSIDE_BEGIN_END(ctx);
  57
  58    if (!ctx->Extensions.ARB_internalformat_query) {
  59       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetInternalformativ");
  60       return;
  61    }
  62
  63    assert(ctx->Driver.QuerySamplesForFormat != NULL);
  64
  65    /* The ARB_internalformat_query spec says:
  66     *
  67     *     "If the <target> parameter to GetInternalformativ is not one of
  68     *     TEXTURE_2D_MULTISAMPLE, TEXTURE_2D_MULTISAMPLE_ARRAY or RENDERBUFFER
  69     *     then an INVALID_ENUM error is generated."
  70     */
  71    switch (target) {
  72    case GL_RENDERBUFFER:
  73       break;
  74
  75    case GL_TEXTURE_2D_MULTISAMPLE:
  76    case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
  77       /* These enums are only valid if ARB_texture_multisample is supported */
  78       if (_mesa_is_desktop_gl(ctx) && ctx->Extensions.ARB_texture_multisample)
  79          break;
  80
  81    default:
  82       _mesa_error(ctx, GL_INVALID_ENUM,
  83                   "glGetInternalformativ(target=%s)",
  84                   _mesa_lookup_enum_by_nr(target));
  85       return;
  86    }
  87
  88    /* The ARB_internalformat_query spec says:
  89     *
  90     *     "If the <internalformat> parameter to GetInternalformativ is not
  91     *     color-, depth- or stencil-renderable, then an INVALID_ENUM error is
  92     *     generated."
  93     */
  94    if (_mesa_base_fbo_format(ctx, internalformat) == 0) {
  95       _mesa_error(ctx, GL_INVALID_ENUM,
  96                   "glGetInternalformativ(internalformat=%s)",
  97                   _mesa_lookup_enum_by_nr(internalformat));
  98       return;
  99    }
 100
 101    /* The ARB_internalformat_query spec says:
 102     *
 103     *     "If the <bufSize> parameter to GetInternalformativ is negative, then
 104     *     an INVALID_VALUE error is generated."
 105     */
 106    if (bufSize < 0) {
 107       _mesa_error(ctx, GL_INVALID_VALUE,
 108                   "glGetInternalformativ(target=%s)",
 109                   _mesa_lookup_enum_by_nr(target));
 110       return;
 111    }
 112
 113    switch (pname) {
 114    case GL_SAMPLES:
 115       count = ctx->Driver.QuerySamplesForFormat(ctx, target,
 116             internalformat, buffer);
 117       break;
 118    case GL_NUM_SAMPLE_COUNTS: {
 119       /* The driver can return 0, and we should pass that along to the
 120        * application.  The ARB decided that ARB_internalformat_query should
 121        * behave as ARB_internalformat_query2 in this situation.
 122        *
 123        * The ARB_internalformat_query2 spec says:
 124        *
 125        *     "- NUM_SAMPLE_COUNTS: The number of sample counts that would be
 126        *        returned by querying SAMPLES is returned in <params>.
 127        *        * If <internalformat> is not color-renderable,
 128        *          depth-renderable, or stencil-renderable (as defined in
 129        *          section 4.4.4), or if <target> does not support multiple
 130        *          samples (ie other than TEXTURE_2D_MULTISAMPLE,
 131        *          TEXTURE_2D_MULTISAMPLE_ARRAY, or RENDERBUFFER), 0 is
 132        *          returned."
 133        */
 134       const size_t num_samples =
 135          ctx->Driver.QuerySamplesForFormat(ctx, target, internalformat, buffer);
 136
 137       /* QuerySamplesForFormat writes some stuff to buffer, so we have to
 138        * separately over-write it with the requested value.
 139        */
 140       buffer[0] = (GLint) num_samples;
 141       count = 1;
 142       break;
 143    }
 144    default:
 145       _mesa_error(ctx, GL_INVALID_ENUM,
 146                   "glGetInternalformativ(pname=%s)",
 147                   _mesa_lookup_enum_by_nr(pname));
 148       return;
 149    }
 150
 151    if (bufSize != 0 && params == NULL) {
 152       /* Emit a warning to aid application debugging, but go ahead and do the
 153        * memcpy (and probably crash) anyway.
 154        */
 155       _mesa_warning(ctx,
 156                     "glGetInternalformativ(bufSize = %d, but params = NULL)",
 157                     bufSize);
 158    }
 159
 160    /* Copy the data from the temporary buffer to the buffer supplied by the
 161     * application.  Clamp the size of the copy to the size supplied by the
 162     * application.
 163     */
 164    memcpy(params, buffer, MIN2(count, bufSize) * sizeof(GLint));
 165
 166    return;
 167 }