1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
/*
* Copyright 2019 The Emscripten Authors. All rights reserved.
* Emscripten is available under two separate licenses, the MIT license and the
* University of Illinois/NCSA Open Source License. Both these licenses can be
* found in the LICENSE file.
*/
#ifndef EXPLICIT_SWAP
#error EXPLICIT_SWAP is required.
#endif
#include <stdlib.h>
#include <emscripten/emscripten.h>
#include <emscripten/html5.h>
#include <GLES2/gl2.h>
int main() {
EmscriptenWebGLContextAttributes attr;
emscripten_webgl_init_context_attributes(&attr);
attr.explicitSwapControl = 1;
#if TEST_WEBGL2
attr.majorVersion = 2;
#endif
#if !TEST_ANTIALIAS
attr.antialias = 0;
#endif
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE ctx = emscripten_webgl_create_context("#canvas", &attr);
emscripten_webgl_make_context_current(ctx);
#if !TEST_WEBGL2 && TEST_VAO
// This test cannot run without browser support for OES_vertex_array_object.
if (!emscripten_webgl_enable_extension(ctx, "OES_vertex_array_object")) {
return 1;
}
#endif
glClearColor(0, 1, 0, 1);
glClear(GL_COLOR_BUFFER_BIT);
glEnableVertexAttribArray(1);
emscripten_webgl_commit_frame();
if (glGetError() != GL_NO_ERROR) {
return 1;
}
// C doesn't have access to the "frontbuffer" (canvas contents).
// Escape via JavaScript to ensure the test passed.
int canvas_is_green = EM_ASM_INT({
GLctx.bindFramebuffer(GLctx.FRAMEBUFFER, null);
var pixels = new Uint8Array(4);
GLctx.readPixels(5, 5, 1, 1, GLctx.RGBA, GLctx.UNSIGNED_BYTE, pixels);
return pixels[0] == 0 && pixels[1] == 255 && pixels[2] == 0 && pixels[3] == 255;
});
if (!canvas_is_green) {
return 1;
}
return 0;
}
|
