/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "WebGL2Context.h"

#include "GLContext.h"

#include "WebGLContextUtils.h"

namespace mozilla {

void

WebGL2Context::GetInternalformatParameter(JSContext* cx, GLenum target,

                                          GLenum internalformat, GLenum pname,

                                          JS::MutableHandleValue retval,

                                          ErrorResult& out_rv)

{

    const FuncScope funcScope(*this, "getInternalfomratParameter");

    retval.setObjectOrNull(nullptr);

    if (IsContextLost())

        return;

    if (target != LOCAL_GL_RENDERBUFFER) {

        ErrorInvalidEnum("`target` must be RENDERBUFFER.");

        return;

    }

    // GLES 3.0.4 $4.4.4 p212:

    // "An internal format is color-renderable if it is one of the formats from table 3.13

    //  noted as color-renderable or if it is unsized format RGBA or RGB."

    GLenum sizedFormat;

    switch (internalformat) {

    case LOCAL_GL_RGB:

        sizedFormat = LOCAL_GL_RGB8;

        break;

    case LOCAL_GL_RGBA:

        sizedFormat = LOCAL_GL_RGBA8;

        break;

    default:

        sizedFormat = internalformat;

        break;

    }

    // In RenderbufferStorage, we allow DEPTH_STENCIL. Therefore, it is accepted for

    // internalformat as well. Please ignore the conformance test fail for DEPTH_STENCIL.

    const auto usage = mFormatUsage->GetRBUsage(sizedFormat);

    if (!usage) {

        ErrorInvalidEnum("`internalformat` must be color-, depth-, or stencil-renderable, was: 0x%04x.",

                         internalformat);

        return;

    }

    if (pname != LOCAL_GL_SAMPLES) {

        ErrorInvalidEnum("`pname` must be SAMPLES.");

        return;

    }

    GLint* samples = nullptr;

    GLint sampleCount = 0;

    gl->fGetInternalformativ(LOCAL_GL_RENDERBUFFER, internalformat,

                             LOCAL_GL_NUM_SAMPLE_COUNTS, 1, &sampleCount);

    if (sampleCount > 0) {

        samples = new GLint[sampleCount];

        gl->fGetInternalformativ(LOCAL_GL_RENDERBUFFER, internalformat, LOCAL_GL_SAMPLES,

                                 sampleCount, samples);

    }

    JSObject* obj = dom::Int32Array::Create(cx, this, sampleCount, samples);

    if (!obj) {

        out_rv = NS_ERROR_OUT_OF_MEMORY;

    }

    delete[] samples;

    retval.setObjectOrNull(obj);

}

} // namespace mozilla