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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "LuaShaderContainer.h"
#include "Lua/LuaParser.h"
#include "Lua/LuaUtils.h"
#include "Lua/LuaUnsyncedCtrl.h"
#include "Lua/LuaUnsyncedRead.h"
#include "Rendering/GlobalRendering.h"
#include "Rendering/Shaders/ShaderHandler.h"
#include "Rendering/Shaders/Shader.h"
#include "System/Util.h"
#include "System/Log/ILog.h"
#include <sstream>
enum {
UNIFORM_TYPE_INT = 0, // includes arrays
UNIFORM_TYPE_FLOAT = 1, // includes arrays
UNIFORM_TYPE_FLOAT_MATRIX = 2,
};
static void ParseUniformsTable(Shader::IProgramObject* program, const LuaTable* root, const std::string& fieldName, int type)
{
const LuaTable subTable = root->SubTable(fieldName);
std::vector<std::string> keys;
subTable.GetKeys(keys);
for (const std::string& key: keys) {
switch (type) {
case UNIFORM_TYPE_INT: {
if (subTable.GetType(key) == LuaTable::TABLE) {
const LuaTable values = subTable.SubTable(key);
int vi[4];
for (int i = 0; i<4; ++i) {
vi[i] = values.GetInt(i+1, 0);
}
program->SetUniform4v(key, vi);
} else {
program->SetUniform(key, subTable.GetInt(key, 0));
}
} break;
case UNIFORM_TYPE_FLOAT: {
if (subTable.GetType(key) == LuaTable::TABLE) {
const LuaTable values = subTable.SubTable(key);
float vf[4];
for (int i = 0; i<4; ++i) {
vf[i] = values.GetFloat(i+1, 0.0f);
}
program->SetUniform4v(key, vf);
} else {
program->SetUniform(key, subTable.GetFloat(key, 0.0f));
}
} break;
case UNIFORM_TYPE_FLOAT_MATRIX: {
if (subTable.GetType(key) == LuaTable::TABLE) {
const LuaTable values = subTable.SubTable(key);
float vf[16];
switch (values.GetLength()) {
case 4: {
for (int i = 0; i<4; ++i) {
vf[i] = values.GetFloat(i+1, 0.0f);
}
program->SetUniformMatrix2x2(key, false, vf);
} break;
case 9: {
for (int i = 0; i<9; ++i) {
vf[i] = values.GetFloat(i+1, 0.0f);
}
program->SetUniformMatrix3x3(key, false, vf);
} break;
case 16: {
for (int i = 0; i<16; ++i) {
vf[i] = values.GetFloat(i+1, 0.0f);
}
program->SetUniformMatrix4x4(key, false, vf);
} break;
default:
LOG_L(L_ERROR, "%s-shader uniformMatrix error: only square matrices supported right now: %s", program->GetName().c_str(), program->GetLog().c_str());
}
}
} break;
};
}
}
static void ParseUniformSetupTables(Shader::IProgramObject* program, const LuaTable* root)
{
ParseUniformsTable(program, root, "uniform", UNIFORM_TYPE_FLOAT );
ParseUniformsTable(program, root, "uniformFloat", UNIFORM_TYPE_FLOAT );
ParseUniformsTable(program, root, "uniformInt", UNIFORM_TYPE_INT );
ParseUniformsTable(program, root, "uniformMatrix", UNIFORM_TYPE_FLOAT_MATRIX);
}
static void CreateShaderObject(
Shader::IProgramObject* program,
const std::string& definitions,
const std::string& sources,
const GLenum type
) {
if (sources.empty())
return;
program->AttachShaderObject(shaderHandler->CreateShaderObject(sources, definitions, type));
}
static void ParseShaderTable(
const LuaTable* root,
const std::string key,
std::stringstream& data
) {
const auto keyType = root->GetType(key);
switch (keyType) {
case LuaTable::STRING: {
data << root->GetString(key, "");
} break;
case LuaTable::TABLE: {
const LuaTable shaderCode = root->SubTable(key);
for (int i = 1; shaderCode.KeyExists(i); ++i) {
data << shaderCode.GetString(i, "");
}
} break;
default:
if (root->KeyExists(key)) {
//FIXME shaders.errorLog = "\"" + string(key) + "\" must be a string or a table value!";
}
};
}
static void LoadTextures(Shader::IProgramObject* program, const LuaTable* root)
{
const LuaTable textures = root->SubTable("textures");
std::map<int, std::string> data;
textures.GetMap(data);
for (const auto& p: data) {
program->AddTextureBinding(p.first, p.second);
}
}
namespace Shader {
bool LoadFromLua(Shader::IProgramObject* program, const std::string& filename)
{
// lua only supports glsl shaders
assert(dynamic_cast<Shader::GLSLProgramObject*>(program) != nullptr);
if (!globalRendering->haveGLSL) {
return false;
}
LuaParser p(filename, SPRING_VFS_RAW_FIRST, SPRING_VFS_BASE);
p.SetLowerKeys(false);
p.SetLowerCppKeys(false);
p.GetTable("Spring");
p.AddFunc("GetConfigInt", LuaUnsyncedCtrl::GetConfigInt);
p.AddFunc("GetConfigString", LuaUnsyncedCtrl::GetConfigString);
p.AddFunc("GetLosViewColors", LuaUnsyncedRead::GetLosViewColors);
p.EndTable();
if (!p.Execute()) {
LOG_L(L_ERROR, "Failed to parse lua shader \"%s\": %s", filename.c_str(), p.GetErrorLog().c_str());
return false;
}
const LuaTable root = p.GetRoot();
LoadTextures(program, &root);
std::stringstream shdrDefs;
std::stringstream vertSrcs;
std::stringstream geomSrcs;
std::stringstream fragSrcs;
ParseShaderTable(&root, "definitions", shdrDefs);
ParseShaderTable(&root, "vertex", vertSrcs);
ParseShaderTable(&root, "geometry", geomSrcs);
ParseShaderTable(&root, "fragment", fragSrcs);
if (vertSrcs.str().empty() && fragSrcs.str().empty() && geomSrcs.str().empty())
return false;
CreateShaderObject(program, shdrDefs.str(), vertSrcs.str(), GL_VERTEX_SHADER);
CreateShaderObject(program, shdrDefs.str(), geomSrcs.str(), GL_GEOMETRY_SHADER_EXT);
CreateShaderObject(program, shdrDefs.str(), fragSrcs.str(), GL_FRAGMENT_SHADER);
//FIXME ApplyGeometryParameters(L, 1, prog); // done before linking
program->Link();
if (!program->IsValid()) {
const char* fmt = "%s-shader compilation error: %s";
LOG_L(L_ERROR, fmt, program->GetName().c_str(), program->GetLog().c_str());
return false;
} else {
program->Enable();
ParseUniformSetupTables(program, &root);
program->Disable();
program->Validate();
if (!program->IsValid()) {
const char* fmt = "%s-shader validation error: %s";
LOG_L(L_ERROR, fmt, program->GetName().c_str(), program->GetLog().c_str());
return false;
}
}
return true;
}
};
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