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#include <GLES3/gl3.h>
#include <webgl/webgl2.h>
#include <emscripten/html5_webgl.h>
#include <string.h>
#include <stdio.h>
#include <assert.h>
int main()
{
EmscriptenWebGLContextAttributes attr;
emscripten_webgl_init_context_attributes(&attr);
attr.majorVersion = 2;
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE ctx = emscripten_webgl_create_context("#canvas", &attr);
emscripten_webgl_make_context_current(ctx);
GLuint buffer;
glGenBuffers(1, &buffer);
glBindBuffer(GL_ARRAY_BUFFER, buffer);
const uint8_t data[] = { 0, 1, 2, 3, 4, 5, 6, 7 };
glGenBuffers(1, &buffer);
glBindBuffer(GL_ARRAY_BUFFER, buffer);
glBufferData(GL_ARRAY_BUFFER, sizeof(data), data, GL_STATIC_DRAW);
uint8_t data2[8] = {};
// Test full buffer read
glGetBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(data), data2);
assert(!memcmp(data, data2, sizeof(data)));
// Test partial buffer read
memset(data2, 0, 8);
glGetBufferSubData(GL_ARRAY_BUFFER, 3, 4, data2 + 3);
assert(!memcmp(data + 3, data2 + 3, 4));
assert(data2[0] == 0);
assert(data2[1] == 0);
assert(data2[2] == 0);
assert(data2[7] == 0);
printf("Test passed!\n");
return 0;
}
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