dom/canvas/WebGL2ContextRenderbuffers.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "WebGL2Context.h"
   8
   9 #include "GLContext.h"
  10 #include "WebGLContextUtils.h"
  11 #include "WebGLFormats.h"
  12
  13 namespace mozilla {
  14
  15 Maybe<std::vector<int32_t>> WebGL2Context::GetInternalformatParameter(
  16     GLenum target, GLenum internalformat, GLenum pname) const {
  17   const FuncScope funcScope(*this, "getInternalfomratParameter");
  18   if (IsContextLost()) return Nothing();
  19
  20   if (target != LOCAL_GL_RENDERBUFFER) {
  21     ErrorInvalidEnum("`target` must be RENDERBUFFER.");
  22     return Nothing();
  23   }
  24
  25   // GLES 3.0.4 $4.4.4 p212:
  26   // "An internal format is color-renderable if it is one of the formats from
  27   // table 3.13
  28   //  noted as color-renderable or if it is unsized format RGBA or RGB."
  29
  30   GLenum sizedFormat;
  31   switch (internalformat) {
  32     case LOCAL_GL_RGB:
  33       sizedFormat = LOCAL_GL_RGB8;
  34       break;
  35     case LOCAL_GL_RGBA:
  36       sizedFormat = LOCAL_GL_RGBA8;
  37       break;
  38     default:
  39       sizedFormat = internalformat;
  40       break;
  41   }
  42
  43   // In RenderbufferStorage, we allow DEPTH_STENCIL. Therefore, it is accepted
  44   // for internalformat as well. Please ignore the conformance test fail for
  45   // DEPTH_STENCIL.
  46
  47   const auto usage = mFormatUsage->GetRBUsage(sizedFormat);
  48   if (!usage) {
  49     ErrorInvalidEnum(
  50         "`internalformat` must be color-, depth-, or stencil-renderable, was: "
  51         "0x%04x.",
  52         internalformat);
  53     return Nothing();
  54   }
  55
  56   if (pname != LOCAL_GL_SAMPLES) {
  57     ErrorInvalidEnum("`pname` must be SAMPLES.");
  58     return Nothing();
  59   }
  60
  61   std::vector<int32_t> ret;
  62   GLint sampleCount = 0;
  63   gl->fGetInternalformativ(LOCAL_GL_RENDERBUFFER, internalformat,
  64                            LOCAL_GL_NUM_SAMPLE_COUNTS, 1, &sampleCount);
  65   if (sampleCount) {
  66     ret.resize(sampleCount);
  67     gl->fGetInternalformativ(LOCAL_GL_RENDERBUFFER, internalformat,
  68                              LOCAL_GL_SAMPLES, ret.size(), ret.data());
  69   }
  70
  71   return Some(ret);
  72 }
  73
  74 }  // namespace mozilla