glTexImage2D(GL_TEXTURE_2D, 0, GL_R16_SNORM, 512, 512, 0, GL_RED, GL_SHORT, data);

layout (binding = 0) uniform sampler2D heightmap;

float height = texture(heightmap, inTexCoords).r;

glTexImage2D(GL_TEXTURE_2D, 0, GL_R16I, 512, 512, 0, GL_RED, GL_SHORT, data);

layout (binding = 0) uniform isampler2D heightmap;    // < -- Notice I put isampler here

float height = texture(heightmap, inTexCoords).r;     // < -- This should return an ivec4, the r value should have my 16 bit signed value, right?