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// Copyright 2016 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.
#define GL_GLEXT_PROTOTYPES
#include <GLES/gl.h>
#include <GLES/glext.h>
#include <GLES3/gl3.h>
#include <stdio.h>
#include <emscripten.h>
#include <emscripten/html5.h>
#include <assert.h>
#define GL_CALL( x ) \
{ \
x; \
GLenum error = glGetError(); \
if( error != GL_NO_ERROR ) { \
printf( "GL ERROR: %d, %s\n", (int)error, #x ); \
assert(false); \
} \
} \
int main()
{
emscripten_set_canvas_element_size( "#canvas", 100, 100 );
EmscriptenWebGLContextAttributes attrs;
emscripten_webgl_init_context_attributes(&attrs);
attrs.enableExtensionsByDefault = 1;
attrs.majorVersion = 2;
attrs.minorVersion = 0;
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context = emscripten_webgl_create_context( "#canvas", &attrs );
if (!context)
{
printf("Skipped: WebGL 2 is not supported.\n");
return 0;
}
emscripten_webgl_make_context_current(context);
// Anisotropy
//
GLfloat maxAnisotropy;
GL_CALL( glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &maxAnisotropy) );
printf("max anisotropy: %f\n", maxAnisotropy);
assert(maxAnisotropy > 1.f);
// Vertex Arrays
//
GLuint vao1;
GL_CALL( glGenVertexArrays( 1, &vao1 ) );
GL_CALL( glBindVertexArray( vao1 ) );
printf( "vao1: %d\n", vao1 );
assert(vao1 > 0);
GLint vao2;
GL_CALL( glGetIntegerv( GL_VERTEX_ARRAY_BINDING, &vao2 ) );
printf( "vao2: %d\n", vao2 );
assert(vao2 == vao1);
// Sampler Objects
//
GLuint sampler;
GL_CALL( glGenSamplers( 1, &sampler ) );
assert(sampler > 0);
#if 0 // TODO: Disabled due to https://github.com/KhronosGroup/WebGL/issues/2006
GL_CALL( glSamplerParameteri( sampler, GL_TEXTURE_MAX_ANISOTROPY_EXT, (int)maxAnisotropy ) );
GLfloat maxAnisotropy2;
GL_CALL( glGetSamplerParameterfv( sampler, GL_TEXTURE_MAX_ANISOTROPY_EXT, &maxAnisotropy2 ) );
printf("max anisotropy: %f\n", maxAnisotropy2);
assert(maxAnisotropy2 == maxAnisotropy);
#endif
GL_CALL( glBindSampler( 0, sampler ) );
GLint sampler2;
GL_CALL( glGetIntegerv( GL_SAMPLER_BINDING, &sampler2 ) );
printf( "sampler2: %d\n", sampler2 );
assert(sampler2 == sampler);
return 0;
}
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