dom/canvas/WebGL2ContextState.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 "WebGLBuffer.h"
  11 #include "WebGLContextUtils.h"
  12 #include "WebGLFramebuffer.h"
  13 #include "WebGLSampler.h"
  14 #include "WebGLTransformFeedback.h"
  15 #include "WebGLVertexArray.h"
  16
  17 namespace mozilla {
  18
  19 Maybe<double> WebGL2Context::GetParameter(GLenum pname) {
  20   const FuncScope funcScope(*this, "getParameter");
  21   // The following cases are handled in WebGLContext::GetParameter():
  22   //     case LOCAL_GL_MAX_COLOR_ATTACHMENTS:
  23   //     case LOCAL_GL_MAX_DRAW_BUFFERS:
  24   //     case LOCAL_GL_DRAW_BUFFERi:
  25
  26   if (IsContextLost()) return Nothing();
  27
  28   switch (pname) {
  29     /* GLboolean */
  30     case LOCAL_GL_RASTERIZER_DISCARD:
  31     case LOCAL_GL_SAMPLE_ALPHA_TO_COVERAGE:
  32     case LOCAL_GL_SAMPLE_COVERAGE: {
  33       realGLboolean b = 0;
  34       gl->fGetBooleanv(pname, &b);
  35       return Some(bool(b));
  36     }
  37
  38     case LOCAL_GL_TRANSFORM_FEEDBACK_ACTIVE:
  39       return Some(mBoundTransformFeedback->mIsActive);
  40     case LOCAL_GL_TRANSFORM_FEEDBACK_PAUSED:
  41       return Some(mBoundTransformFeedback->mIsPaused);
  42
  43     /* GLenum */
  44     case LOCAL_GL_READ_BUFFER: {
  45       if (!mBoundReadFramebuffer) return Some(mDefaultFB_ReadBuffer);
  46
  47       if (!mBoundReadFramebuffer->ColorReadBuffer()) return Some(LOCAL_GL_NONE);
  48
  49       return Some(mBoundReadFramebuffer->ColorReadBuffer()->mAttachmentPoint);
  50     }
  51
  52     case LOCAL_GL_FRAGMENT_SHADER_DERIVATIVE_HINT:
  53       /* fall through */
  54
  55     /* GLint */
  56     case LOCAL_GL_MAX_COMBINED_UNIFORM_BLOCKS:
  57     case LOCAL_GL_MAX_ELEMENTS_INDICES:
  58     case LOCAL_GL_MAX_ELEMENTS_VERTICES:
  59     case LOCAL_GL_MAX_FRAGMENT_INPUT_COMPONENTS:
  60     case LOCAL_GL_MAX_FRAGMENT_UNIFORM_BLOCKS:
  61     case LOCAL_GL_MAX_FRAGMENT_UNIFORM_COMPONENTS:
  62     case LOCAL_GL_MAX_PROGRAM_TEXEL_OFFSET:
  63     case LOCAL_GL_MAX_SAMPLES:
  64     case LOCAL_GL_MAX_TEXTURE_LOD_BIAS:
  65     case LOCAL_GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS:
  66     case LOCAL_GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS:
  67     case LOCAL_GL_MAX_VERTEX_OUTPUT_COMPONENTS:
  68     case LOCAL_GL_MAX_VERTEX_UNIFORM_BLOCKS:
  69     case LOCAL_GL_MAX_VERTEX_UNIFORM_COMPONENTS:
  70     case LOCAL_GL_MIN_PROGRAM_TEXEL_OFFSET: {
  71       GLint val;
  72       gl->fGetIntegerv(pname, &val);
  73       return Some(val);
  74     }
  75
  76     case LOCAL_GL_MAX_VARYING_COMPONENTS: {
  77       // On OS X Core Profile this is buggy.  The spec says that the
  78       // value is 4 * GL_MAX_VARYING_VECTORS
  79       GLint val;
  80       gl->fGetIntegerv(LOCAL_GL_MAX_VARYING_VECTORS, &val);
  81       return Some(4 * val);
  82     }
  83
  84     case LOCAL_GL_MAX_ELEMENT_INDEX:
  85       // GL_MAX_ELEMENT_INDEX becomes available in GL 4.3 or via ES3
  86       // compatibility
  87       if (!gl->IsSupported(gl::GLFeature::ES3_compatibility))
  88         return Some(UINT32_MAX);
  89
  90       /*** fall through to fGetInteger64v ***/
  91       [[fallthrough]];
  92
  93     case LOCAL_GL_MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS:
  94     case LOCAL_GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS:
  95     case LOCAL_GL_MAX_UNIFORM_BLOCK_SIZE: {
  96       GLint64 val;
  97       gl->fGetInteger64v(pname, &val);
  98       return Some(static_cast<double>(val));
  99     }
 100
 101     /* GLuint64 */
 102     case LOCAL_GL_MAX_SERVER_WAIT_TIMEOUT: {
 103       GLuint64 val;
 104       gl->fGetInteger64v(pname, (GLint64*)&val);
 105       return Some(static_cast<double>(val));
 106     }
 107
 108     default:
 109       return WebGLContext::GetParameter(pname);
 110   }
 111 }
 112
 113 }  // namespace mozilla