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#include "GLShader.h"
#include "GLDebug.h"
#include "../RenderResources.h"
#include "../../Application.h"
#include "../../../Main.h"
#include <string>
#include <IO/FileSystem.h>
using namespace Death::Containers::Literals;
using namespace Death::IO;
namespace nCine
{
namespace
{
#if (defined(WITH_OPENGLES) && GL_ES_VERSION_3_0) || defined(DEATH_TARGET_EMSCRIPTEN)
static constexpr StringView CommonShaderVersion = "#version 300 es\n"_s;
#else
static constexpr StringView CommonShaderVersion = "#version 330\n"_s;
#endif
#if defined(DEATH_TARGET_EMSCRIPTEN)
static constexpr StringView CommonShaderDefines = "#define DEATH_TARGET_EMSCRIPTEN\n#line 0\n"_s;
#elif defined(DEATH_TARGET_ANDROID)
static constexpr StringView CommonShaderDefines = "#define DEATH_TARGET_ANDROID\n#line 0\n"_s;
#elif defined(WITH_ANGLE)
static constexpr StringView CommonShaderDefines = "#define WITH_ANGLE\n#line 0\n"_s;
#else
static constexpr StringView CommonShaderDefines = "#line 0\n"_s;
#endif
}
GLShader::GLShader(GLenum type)
: glHandle_(0), status_(Status::NotCompiled)
{
glHandle_ = glCreateShader(type);
}
GLShader::GLShader(GLenum type, StringView filename)
: GLShader(type)
{
LoadFromFile(filename);
}
GLShader::~GLShader()
{
glDeleteShader(glHandle_);
}
bool GLShader::LoadFromString(StringView string)
{
return LoadFromStringsAndFile(arrayView({ string }), {});
}
bool GLShader::LoadFromStringAndFile(StringView string, StringView filename)
{
return LoadFromStringsAndFile(arrayView({ string }), filename);
}
bool GLShader::LoadFromStrings(ArrayView<const StringView> strings)
{
return LoadFromStringsAndFile(strings, {});
}
bool GLShader::LoadFromStringsAndFile(ArrayView<const StringView> strings, StringView filename)
{
if (strings.empty() && filename.empty()) {
return false;
}
SmallVector<const char*, 10> sourceStrings;
SmallVector<GLint, 10> sourceLengths;
sourceStrings.push_back(CommonShaderVersion.data());
sourceLengths.push_back(static_cast<GLint>(CommonShaderVersion.size()));
sourceStrings.push_back(CommonShaderDefines.data());
sourceLengths.push_back(static_cast<GLint>(CommonShaderDefines.size()));
for (auto string : strings) {
sourceStrings.push_back(string.data());
sourceLengths.push_back(static_cast<GLint>(string.size()));
}
String fileSource;
if (!filename.empty()) {
std::unique_ptr<Stream> fileHandle = fs::Open(filename, FileAccess::Read);
if (!fileHandle->IsValid()) {
return false;
}
const GLint fileLength = static_cast<int>(fileHandle->GetSize());
fileSource = String{NoInit, static_cast<std::size_t>(fileLength)};
fileHandle->Read(fileSource.data(), fileLength);
sourceStrings.push_back(fileSource.data());
sourceLengths.push_back(static_cast<GLint>(fileLength));
SetObjectLabel(filename.data());
}
std::size_t count = sourceStrings.size();
glShaderSource(glHandle_, GLsizei(count), sourceStrings.data(), sourceLengths.data());
return (count > 1);
}
bool GLShader::LoadFromFile(StringView filename)
{
return LoadFromStringsAndFile({}, filename);
}
bool GLShader::Compile(ErrorChecking errorChecking, bool logOnErrors)
{
glCompileShader(glHandle_);
if (errorChecking == ErrorChecking::Immediate) {
return CheckCompilation(logOnErrors);
} else {
status_ = Status::CompiledWithDeferredChecks;
return true;
}
}
bool GLShader::CheckCompilation(bool logOnErrors)
{
if (status_ == Status::Compiled) {
return true;
}
GLint status = GL_FALSE;
glGetShaderiv(glHandle_, GL_COMPILE_STATUS, &status);
if (status == GL_FALSE) {
#if defined(DEATH_TRACE)
if (logOnErrors) {
GLint length = 0;
glGetShaderiv(glHandle_, GL_INFO_LOG_LENGTH, &length);
if (length > 0) {
static char buffer[2048];
glGetShaderInfoLog(glHandle_, sizeof(buffer), &length, buffer);
// Trim whitespace - driver messages usually contain newline(s) at the end
*(MutableStringView(buffer).trimmed().end()) = '\0';
LOGW("Shader: {}", buffer);
}
DEATH_ASSERT_BREAK();
}
#endif
status_ = Status::CompilationFailed;
return false;
}
status_ = Status::Compiled;
return true;
}
void GLShader::SetObjectLabel(StringView label)
{
GLDebug::SetObjectLabel(GLDebug::LabelTypes::Shader, glHandle_, label);
}
}
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