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// Copyright 2014 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.
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <iostream>
#include <string>
#include <sstream>
#include <algorithm>
#include <iterator>
#include <vector>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <emscripten.h>
#include <emscripten/html5.h>
std::vector<std::string> &split(const std::string &s, char delim, std::vector<std::string> &elems) {
std::stringstream ss(s);
std::string item;
while (std::getline(ss, item, delim)) {
elems.push_back(item);
}
return elems;
}
std::vector<std::string> split(const std::string &s, char delim) {
std::vector<std::string> elems;
split(s, delim, elems);
return elems;
}
GLint GetInt(GLenum param)
{
GLint value;
glGetIntegerv(param, &value);
return value;
}
void final(void*) {
emscripten_force_exit(0);
}
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context;
void loop()
{
EMSCRIPTEN_RESULT res;
if (!context) {
// new rendering frame started without a context
EmscriptenWebGLContextAttributes attrs;
emscripten_webgl_init_context_attributes(&attrs);
EM_ASM(
var canvas2 = Module['canvas'].cloneNode(true);
Module['canvas'].parentElement.appendChild(canvas2);
Module['canvas'] = canvas2;
);
assert(emscripten_webgl_get_current_context() == 0);
context = emscripten_webgl_create_context("#canvas", &attrs);
assert(context > 0); // Must have received a valid context.
res = emscripten_webgl_make_context_current(context);
assert(res == EMSCRIPTEN_RESULT_SUCCESS);
assert(emscripten_webgl_get_current_context() == context);
} else {
res = emscripten_webgl_destroy_context(context);
assert(res == EMSCRIPTEN_RESULT_SUCCESS);
assert(emscripten_webgl_get_current_context() == 0);
emscripten_cancel_main_loop();
emscripten_async_call(final, (void*)0, 10);
}
}
int main()
{
bool first = true;
EmscriptenWebGLContextAttributes attrs;
int depth = 0;
int stencil = 0;
int antialias = 0;
#ifndef NO_DEPTH
for(depth = 0; depth <= 1; ++depth)
#endif
#ifndef NO_STENCIL
for(stencil = 0; stencil <= 1; ++stencil)
#endif
#ifndef NO_ANTIALIAS
for(antialias = 0; antialias <= 1; ++antialias)
#endif
{
emscripten_webgl_init_context_attributes(&attrs);
attrs.depth = depth;
attrs.stencil = stencil;
attrs.antialias = antialias;
printf("Requesting depth: %d, stencil: %d, antialias: %d\n", depth, stencil, antialias);
EM_ASM(
var canvas2 = document.createElement('canvas');
Module['canvas'].parentElement.appendChild(canvas2);
canvas2.id = 'customCanvas';
);
assert(emscripten_webgl_get_current_context() == 0);
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context = emscripten_webgl_create_context("#customCanvas", &attrs);
assert(context > 0); // Must have received a valid context.
EMSCRIPTEN_RESULT res = emscripten_webgl_make_context_current(context);
assert(res == EMSCRIPTEN_RESULT_SUCCESS);
assert(emscripten_webgl_get_current_context() == context);
// Let's try enabling all extensions.
const char *extensions = (const char*)glGetString(GL_EXTENSIONS);
std::vector<std::string> exts = split(extensions, ' ');
for(size_t i = 0; i < exts.size(); ++i)
{
EM_BOOL supported = emscripten_webgl_enable_extension(context, exts[i].c_str());
printf("%s\n", exts[i].c_str());
assert(supported);
}
int drawingBufferWidth = -1;
int drawingBufferHeight = -1;
res = emscripten_webgl_get_drawing_buffer_size(context, &drawingBufferWidth, &drawingBufferHeight);
assert(res == EMSCRIPTEN_RESULT_SUCCESS);
printf("drawingBufferWidth x Height: %dx%d\n", drawingBufferWidth, drawingBufferHeight);
assert(drawingBufferWidth == 300);
assert(drawingBufferHeight == 150);
// Try with a simple glClear() that we got a context.
glClearColor(1.f, 0.f, 0.f, 1.f);
glClear(GL_COLOR_BUFFER_BIT);
unsigned char pixels[4];
glReadPixels(0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
assert(pixels[0] == 0xFF);
assert(pixels[1] == 0);
assert(pixels[2] == 0);
assert(pixels[3] == 0xFF);
int numDepthBits = GetInt(GL_DEPTH_BITS);
int numStencilBits = GetInt(GL_STENCIL_BITS);
int numSamples = GetInt(GL_SAMPLES);
printf("RGBA: %d%d%d%d, Depth: %d, Stencil: %d, Samples: %d\n",
GetInt(GL_RED_BITS), GetInt(GL_GREEN_BITS), GetInt(GL_BLUE_BITS), GetInt(GL_ALPHA_BITS),
numDepthBits, numStencilBits, numSamples);
if (!depth && stencil && numDepthBits && numStencilBits && EM_ASM_INT(navigator.userAgent.toLowerCase().indexOf('firefox')) > -1)
{
numDepthBits = 0;
printf("Applying workaround to ignore Firefox bug https://bugzilla.mozilla.org/show_bug.cgi?id=982477\n");
}
assert(!!numDepthBits == !!depth);
assert(!!numStencilBits == !!stencil);
assert(!!numSamples == !!antialias);
printf("\n");
// Test bug https://github.com/emscripten-core/emscripten/issues/1330:
unsigned vb;
glGenBuffers(1, &vb);
glBindBuffer(GL_ARRAY_BUFFER, vb);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
unsigned vb2;
glGenBuffers(1, &vb2);
glBindBuffer(GL_ARRAY_BUFFER, vb2);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, 0);
int vb3;
glGetVertexAttribiv(0, GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING, &vb3);
if (vb != vb3) printf("Index 0: Generated VB: %d, read back VB: %d\n", vb, vb3);
assert(vb == vb3);
int vb4;
glGetVertexAttribiv(1, GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING, &vb4);
if (vb2 != vb4) printf("Index 1: Generated VB: %d, read back VB: %d\n", vb2, vb4);
assert(vb2 == vb4);
// Test bug https://github.com/emscripten-core/emscripten/issues/7472:
GLint enabled = 0;
glGetVertexAttribiv(0, GL_VERTEX_ATTRIB_ARRAY_ENABLED, &enabled);
assert(enabled == 0);
// Test that deleting the context works.
res = emscripten_webgl_destroy_context(context);
assert(res == 0);
assert(emscripten_webgl_get_current_context() == 0);
EM_ASM(
var canvas2 = document.getElementById('customCanvas');
canvas2.parentElement.removeChild(canvas2);
);
}
// result will be reported when mainLoop completes
emscripten_set_main_loop(loop, 0, 0);
return 99;
}
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