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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 : JS::Value
20 0 : WebGL2Context::GetParameter(JSContext* cx, GLenum pname, ErrorResult& rv)
21 : {
22 : // The following cases are handled in WebGLContext::GetParameter():
23 : // case LOCAL_GL_MAX_COLOR_ATTACHMENTS:
24 : // case LOCAL_GL_MAX_DRAW_BUFFERS:
25 : // case LOCAL_GL_DRAW_BUFFERi:
26 :
27 0 : if (IsContextLost())
28 0 : return JS::NullValue();
29 :
30 0 : MakeContextCurrent();
31 :
32 0 : switch (pname) {
33 : /* GLboolean */
34 : case LOCAL_GL_RASTERIZER_DISCARD:
35 : case LOCAL_GL_SAMPLE_ALPHA_TO_COVERAGE:
36 : case LOCAL_GL_SAMPLE_COVERAGE: {
37 0 : realGLboolean b = 0;
38 0 : gl->fGetBooleanv(pname, &b);
39 0 : return JS::BooleanValue(bool(b));
40 : }
41 :
42 : case LOCAL_GL_TRANSFORM_FEEDBACK_ACTIVE:
43 0 : return JS::BooleanValue(mBoundTransformFeedback->mIsActive);
44 : case LOCAL_GL_TRANSFORM_FEEDBACK_PAUSED:
45 0 : return JS::BooleanValue(mBoundTransformFeedback->mIsPaused);
46 :
47 : /* GLenum */
48 : case LOCAL_GL_READ_BUFFER: {
49 0 : if (!mBoundReadFramebuffer)
50 0 : return JS::Int32Value(gl->Screen()->GetReadBufferMode());
51 :
52 0 : if (!mBoundReadFramebuffer->ColorReadBuffer())
53 0 : return JS::Int32Value(LOCAL_GL_NONE);
54 :
55 0 : return JS::Int32Value(mBoundReadFramebuffer->ColorReadBuffer()->mAttachmentPoint);
56 : }
57 :
58 : case LOCAL_GL_FRAGMENT_SHADER_DERIVATIVE_HINT:
59 : /* fall through */
60 :
61 : /* GLint */
62 : case LOCAL_GL_MAX_COMBINED_UNIFORM_BLOCKS:
63 : case LOCAL_GL_MAX_ELEMENTS_INDICES:
64 : case LOCAL_GL_MAX_ELEMENTS_VERTICES:
65 : case LOCAL_GL_MAX_FRAGMENT_INPUT_COMPONENTS:
66 : case LOCAL_GL_MAX_FRAGMENT_UNIFORM_BLOCKS:
67 : case LOCAL_GL_MAX_FRAGMENT_UNIFORM_COMPONENTS:
68 : case LOCAL_GL_MAX_PROGRAM_TEXEL_OFFSET:
69 : case LOCAL_GL_MAX_SAMPLES:
70 : case LOCAL_GL_MAX_TEXTURE_LOD_BIAS:
71 : case LOCAL_GL_MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS:
72 : case LOCAL_GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS:
73 : case LOCAL_GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS:
74 : case LOCAL_GL_MAX_UNIFORM_BUFFER_BINDINGS:
75 : case LOCAL_GL_MAX_VERTEX_OUTPUT_COMPONENTS:
76 : case LOCAL_GL_MAX_VERTEX_UNIFORM_BLOCKS:
77 : case LOCAL_GL_MAX_VERTEX_UNIFORM_COMPONENTS:
78 : case LOCAL_GL_MIN_PROGRAM_TEXEL_OFFSET:
79 : case LOCAL_GL_PACK_ROW_LENGTH:
80 : case LOCAL_GL_PACK_SKIP_PIXELS:
81 : case LOCAL_GL_PACK_SKIP_ROWS:
82 : case LOCAL_GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT:
83 : case LOCAL_GL_UNPACK_IMAGE_HEIGHT:
84 : case LOCAL_GL_UNPACK_ROW_LENGTH: {
85 : GLint val;
86 0 : gl->fGetIntegerv(pname, &val);
87 0 : return JS::Int32Value(val);
88 : }
89 :
90 : case LOCAL_GL_UNPACK_SKIP_IMAGES:
91 0 : return JS::Int32Value(mPixelStore_UnpackSkipImages);
92 :
93 : case LOCAL_GL_UNPACK_SKIP_PIXELS:
94 0 : return JS::Int32Value(mPixelStore_UnpackSkipPixels);
95 :
96 : case LOCAL_GL_UNPACK_SKIP_ROWS:
97 0 : return JS::Int32Value(mPixelStore_UnpackSkipRows);
98 :
99 : case LOCAL_GL_MAX_3D_TEXTURE_SIZE:
100 0 : return JS::Int32Value(mImplMax3DTextureSize);
101 :
102 : case LOCAL_GL_MAX_ARRAY_TEXTURE_LAYERS:
103 0 : return JS::Int32Value(mImplMaxArrayTextureLayers);
104 :
105 : case LOCAL_GL_MAX_VARYING_COMPONENTS: {
106 : // On OS X Core Profile this is buggy. The spec says that the
107 : // value is 4 * GL_MAX_VARYING_VECTORS
108 : GLint val;
109 0 : gl->fGetIntegerv(LOCAL_GL_MAX_VARYING_VECTORS, &val);
110 0 : return JS::Int32Value(4*val);
111 : }
112 :
113 : /* GLint64 */
114 : case LOCAL_GL_MAX_CLIENT_WAIT_TIMEOUT_WEBGL:
115 0 : return JS::NumberValue(kMaxClientWaitSyncTimeoutNS);
116 :
117 : case LOCAL_GL_MAX_ELEMENT_INDEX:
118 : // GL_MAX_ELEMENT_INDEX becomes available in GL 4.3 or via ES3
119 : // compatibility
120 0 : if (!gl->IsSupported(gl::GLFeature::ES3_compatibility))
121 0 : return JS::NumberValue(UINT32_MAX);
122 :
123 : /*** fall through to fGetInteger64v ***/
124 : MOZ_FALLTHROUGH;
125 :
126 : case LOCAL_GL_MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS:
127 : case LOCAL_GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS:
128 : case LOCAL_GL_MAX_UNIFORM_BLOCK_SIZE: {
129 : GLint64 val;
130 0 : gl->fGetInteger64v(pname, &val);
131 0 : return JS::DoubleValue(static_cast<double>(val));
132 : }
133 :
134 :
135 : /* GLuint64 */
136 : case LOCAL_GL_MAX_SERVER_WAIT_TIMEOUT: {
137 : GLuint64 val;
138 0 : gl->fGetInteger64v(pname, (GLint64*) &val);
139 0 : return JS::DoubleValue(static_cast<double>(val));
140 : }
141 :
142 : case LOCAL_GL_COPY_READ_BUFFER_BINDING:
143 0 : return WebGLObjectAsJSValue(cx, mBoundCopyReadBuffer.get(), rv);
144 :
145 : case LOCAL_GL_COPY_WRITE_BUFFER_BINDING:
146 0 : return WebGLObjectAsJSValue(cx, mBoundCopyWriteBuffer.get(), rv);
147 :
148 : case LOCAL_GL_PIXEL_PACK_BUFFER_BINDING:
149 0 : return WebGLObjectAsJSValue(cx, mBoundPixelPackBuffer.get(), rv);
150 :
151 : case LOCAL_GL_PIXEL_UNPACK_BUFFER_BINDING:
152 0 : return WebGLObjectAsJSValue(cx, mBoundPixelUnpackBuffer.get(), rv);
153 :
154 : case LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER_BINDING:
155 : {
156 0 : const auto& tf = mBoundTransformFeedback;
157 0 : return WebGLObjectAsJSValue(cx, tf->mGenericBufferBinding.get(), rv);
158 : }
159 :
160 : case LOCAL_GL_UNIFORM_BUFFER_BINDING:
161 0 : return WebGLObjectAsJSValue(cx, mBoundUniformBuffer.get(), rv);
162 :
163 : // DRAW_FRAMEBUFFER_BINDING is the same as FRAMEBUFFER_BINDING.
164 : case LOCAL_GL_READ_FRAMEBUFFER_BINDING:
165 0 : return WebGLObjectAsJSValue(cx, mBoundReadFramebuffer.get(), rv);
166 :
167 : case LOCAL_GL_SAMPLER_BINDING:
168 0 : return WebGLObjectAsJSValue(cx, mBoundSamplers[mActiveTexture].get(), rv);
169 :
170 : case LOCAL_GL_TEXTURE_BINDING_2D_ARRAY:
171 0 : return WebGLObjectAsJSValue(cx, mBound2DArrayTextures[mActiveTexture].get(), rv);
172 :
173 : case LOCAL_GL_TEXTURE_BINDING_3D:
174 0 : return WebGLObjectAsJSValue(cx, mBound3DTextures[mActiveTexture].get(), rv);
175 :
176 : case LOCAL_GL_TRANSFORM_FEEDBACK_BINDING:
177 : {
178 0 : const WebGLTransformFeedback* tf = mBoundTransformFeedback;
179 0 : if (tf == mDefaultTransformFeedback) {
180 0 : tf = nullptr;
181 : }
182 0 : return WebGLObjectAsJSValue(cx, tf, rv);
183 : }
184 :
185 : case LOCAL_GL_VERTEX_ARRAY_BINDING: {
186 : WebGLVertexArray* vao =
187 0 : (mBoundVertexArray != mDefaultVertexArray) ? mBoundVertexArray.get() : nullptr;
188 0 : return WebGLObjectAsJSValue(cx, vao, rv);
189 : }
190 :
191 : case LOCAL_GL_VERSION:
192 0 : return StringValue(cx, "WebGL 2.0", rv);
193 :
194 : case LOCAL_GL_SHADING_LANGUAGE_VERSION:
195 0 : return StringValue(cx, "WebGL GLSL ES 3.00", rv);
196 :
197 : default:
198 0 : return WebGLContext::GetParameter(cx, pname, rv);
199 : }
200 : }
201 :
202 : } // namespace mozilla
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