1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
// license:BSD-3-Clause
// copyright-holders:Ryan Holtz
//============================================================
//
// uniformreader.cpp - BGFX shader uniform JSON reader
//
//============================================================
#include "uniformreader.h"
#include "uniform.h"
const uniform_reader::string_to_enum uniform_reader::TYPE_NAMES[uniform_reader::TYPE_COUNT] = {
{ "int", bgfx::UniformType::Sampler },
{ "vec4", bgfx::UniformType::Vec4 },
{ "mat3", bgfx::UniformType::Mat3 },
{ "mat4", bgfx::UniformType::Mat4 }
};
bgfx_uniform* uniform_reader::read_from_value(const Value& value, std::string prefix)
{
if (!validate_parameters(value, prefix))
{
return nullptr;
}
const char* name = value["name"].GetString();
bgfx::UniformType::Enum type = bgfx::UniformType::Enum(get_enum_from_value(value, "type", bgfx::UniformType::Vec4, TYPE_NAMES, TYPE_COUNT));
const size_t type_size = bgfx_uniform::get_size_for_type(type);
const Value& value_array = value["values"];
const size_t array_size = value_array.Size() * sizeof(float);
const size_t alloc_size = (type_size > array_size) ? type_size : array_size;
auto* data = reinterpret_cast<float*>(new char[alloc_size]);
unsigned int index = 0;
for (; index < type_size / 4 && index < value_array.Size(); index++)
{
data[index] = (float)value_array[index].GetDouble();
}
for (; index < type_size / 4; index++)
{
data[index] = 0.0f;
}
auto* uniform = new bgfx_uniform(name, type);
uniform->set((void*)data, type_size);
delete [] data;
return uniform;
}
bool uniform_reader::validate_parameters(const Value& value, std::string prefix)
{
if (!READER_CHECK(value.HasMember("name"), (prefix + "Must have string value 'name' (what is this uniform called in the shader code?)\n").c_str())) return false;
if (!READER_CHECK(value["name"].IsString(), (prefix + "Value 'name' must be a string\n").c_str())) return false;
if (!READER_CHECK(value.HasMember("type"), (prefix + "Must have string value 'type' [int, vec4, mat3, mat4]\n").c_str())) return false;
if (!READER_CHECK(value.HasMember("values"), (prefix + "Must have array value 'values' (what are the uniform's default values?)\n").c_str())) return false;
if (!READER_CHECK(value["values"].IsArray(), (prefix + "Value 'values' must be an array\n").c_str())) return false;
return true;
}
|