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// Gawain vertex attribute binding
//
// This code is part of the Gawain library, with modifications
// specific to integration with Blender.
//
// Copyright 2016 Mike Erwin
//
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of
// the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
#include "attrib_binding.h"
#if MAX_VERTEX_ATTRIBS != 16
#error "attrib binding code assumes MAX_VERTEX_ATTRIBS = 16"
#endif
void clear_AttribBinding(AttribBinding* binding)
{
binding->loc_bits = 0;
binding->enabled_bits = 0;
}
unsigned read_attrib_location(const AttribBinding* binding, unsigned a_idx)
{
#if TRUST_NO_ONE
assert(a_idx < MAX_VERTEX_ATTRIBS);
assert(binding->enabled_bits & (1 << a_idx));
#endif
return (binding->loc_bits >> (4 * a_idx)) & 0xF;
}
static void write_attrib_location(AttribBinding* binding, unsigned a_idx, unsigned location)
{
#if TRUST_NO_ONE
assert(a_idx < MAX_VERTEX_ATTRIBS);
assert(location < MAX_VERTEX_ATTRIBS);
#endif
const unsigned shift = 4 * a_idx;
const uint64_t mask = ((uint64_t)0xF) << shift;
// overwrite this attrib's previous location
binding->loc_bits = (binding->loc_bits & ~mask) | (location << shift);
// mark this attrib as enabled
binding->enabled_bits |= 1 << a_idx;
}
void get_attrib_locations(const VertexFormat* format, AttribBinding* binding, GLuint program)
{
#if TRUST_NO_ONE
assert(glIsProgram(program));
#endif
clear_AttribBinding(binding);
for (unsigned a_idx = 0; a_idx < format->attrib_ct; ++a_idx)
{
const Attrib* a = format->attribs + a_idx;
GLint loc = glGetAttribLocation(program, a->name);
#if TRUST_NO_ONE
assert(loc != -1);
// TODO: make this a recoverable runtime error? indicates mismatch between vertex format and program
#endif
write_attrib_location(binding, a_idx, loc);
}
}
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