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#include <emscripten/html5_webgl.h>
#include <emscripten/html5.h>
#include <webgl/webgl2.h>
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
#include <string.h>
void test(const char *src)
{
GLuint shader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(shader, 1, &src, NULL);
glCompileShader(shader);
printf("%s\n", emscripten_webgl_get_shader_info_log_utf8(shader));
assert(emscripten_webgl_get_shader_parameter_d(shader, GL_COMPILE_STATUS) == 1);
}
int main()
{
EmscriptenWebGLContextAttributes attrs;
emscripten_webgl_init_context_attributes(&attrs);
attrs.majorVersion = WEBGL_VERSION;
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context = emscripten_webgl_create_context("#canvas", &attrs);
emscripten_webgl_make_context_current(context);
// Test the presence of GL_FRAGMENT_PRECISION_HIGH built-in preprocessor
test("#ifdef GL_FRAGMENT_PRECISION_HIGH\n"
"void main() {}\n"
"#endif");
test("#if GL_FRAGMENT_PRECISION_HIGH == 1\n"
"void main() {}\n"
"#endif");
// Test GL_ES built-in preprocessor directive
test("#ifdef GL_ES\n"
"void main() {}\n"
"#endif");
test("#if GL_ES == 1\n"
"void main() {}\n"
"#endif");
test("#if GL_ES != 1\n" // Also check negation, i.e. that #if is not tautologically true
"error!\n"
"#else\n"
"void main() {}\n"
"#endif");
// Test __VERSION__ built-in preprocessor directive.
// Note that when WebGL 2 contexts are created, shaders
// still default to #version 100, unless explicit
// "#version 300 es" is specified.
test("#ifdef __VERSION__\n"
"void main() {}\n"
"#endif");
test("#if __VERSION__ == 100\n"
"void main() {}\n"
"#endif");
test("#if defined(GL_ES) && __VERSION__ < 300\n"
"void main() {}\n"
"#endif");
test("#if !defined(GL_ES) || __VERSION__ >= 300\n" // for good measure, check via negation
"error!\n"
"#else\n"
"void main() {}\n"
"#endif");
#if WEBGL_VERSION >= 2
test("#version 100\n"
"#if __VERSION__ == 300\n"
"error!\n"
"#endif\n"
"void main() {}");
test("#version 300 es\n"
"#if __VERSION__ == 300\n"
"void main() {}\n"
"#endif");
#endif
return 0;
}
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