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#include <mbgl/shader/shader.hpp>
#include <mbgl/platform/gl.hpp>
#include <mbgl/util/stopwatch.hpp>
#include <mbgl/platform/log.hpp>
#include <mbgl/platform/platform.hpp>
#include <cstring>
#include <cassert>
#include <iostream>
#include <fstream>
#include <cstdio>
using namespace mbgl;
Shader::Shader(const char *name_, const GLchar *vertSource, const GLchar *fragSource)
: name(name_),
valid(false),
program(0) {
util::stopwatch stopwatch("shader compilation", Event::Shader);
program = MBGL_CHECK_ERROR(glCreateProgram());
if (!mbgl::platform::defaultShaderCache().empty()) {
binaryFileName = mbgl::platform::defaultShaderCache() + name + ".bin";
}
// Load binary shader if it exists
bool skipCompile = false;
if (!binaryFileName.empty() && (gl::ProgramBinary != nullptr)) {
try {
std::ifstream binaryFile(binaryFileName, std::ios::in | std::ios::binary);
binaryFile.exceptions(std::ifstream::failbit | std::ifstream::badbit | std::ifstream::eofbit);
GLsizei binaryLength;
GLenum binaryFormat;
binaryFile.read(reinterpret_cast<char *>(&binaryLength), sizeof(binaryLength));
binaryFile.read(reinterpret_cast<char *>(&binaryFormat), sizeof(binaryFormat));
GLint numBinaryFormats;
MBGL_CHECK_ERROR(glGetIntegerv(GL_NUM_PROGRAM_BINARY_FORMATS, &numBinaryFormats));
std::unique_ptr<GLenum[]> validBinaryFormats = mbgl::util::make_unique<GLenum[]>(numBinaryFormats);
MBGL_CHECK_ERROR(glGetIntegerv(GL_PROGRAM_BINARY_FORMATS, reinterpret_cast<GLint *>(validBinaryFormats.get())));
bool validBinaryFormat = false;
for (GLint i = 0; i < numBinaryFormats; i++) {
if (validBinaryFormats[i] == binaryFormat) {
validBinaryFormat = true;
}
}
if (!validBinaryFormat) {
throw std::runtime_error("Trying load program binary with an invalid binaryFormat!");
}
if (binaryLength == 0) {
throw std::runtime_error("Trying load program binary with a zero length binary!");
}
std::unique_ptr<char[]> binary = mbgl::util::make_unique<char[]>(binaryLength);
binaryFile.read(binary.get(), binaryLength);
MBGL_CHECK_ERROR(gl::ProgramBinary(program, binaryFormat, binary.get(), binaryLength));
// Check if the binary was valid
GLint status;
MBGL_CHECK_ERROR(glGetProgramiv(program, GL_LINK_STATUS, &status));
if (status == GL_TRUE) {
skipCompile = true;
}
} catch(const std::exception& e) {
Log::Error(Event::Shader, "Loading binary shader failed!");
// Delete the bad file
std::remove(binaryFileName.c_str());
}
}
GLuint vertShader = 0;
GLuint fragShader = 0;
if (!skipCompile) {
if (!compileShader(&vertShader, GL_VERTEX_SHADER, vertSource)) {
Log::Error(Event::Shader, "Vertex shader %s failed to compile: %s", name, vertSource);
MBGL_CHECK_ERROR(glDeleteProgram(program));
program = 0;
return;
}
if (!compileShader(&fragShader, GL_FRAGMENT_SHADER, fragSource)) {
Log::Error(Event::Shader, "Fragment shader %s failed to compile: %s", name, fragSource);
MBGL_CHECK_ERROR(glDeleteShader(vertShader));
vertShader = 0;
MBGL_CHECK_ERROR(glDeleteProgram(program));
program = 0;
return;
}
// Attach shaders
MBGL_CHECK_ERROR(glAttachShader(program, vertShader));
MBGL_CHECK_ERROR(glAttachShader(program, fragShader));
{
if (!binaryFileName.empty() && (gl::ProgramParameteri != nullptr)) {
MBGL_CHECK_ERROR(gl::ProgramParameteri(program, GL_PROGRAM_BINARY_RETRIEVABLE_HINT, GL_TRUE));
}
// Link program
GLint status;
MBGL_CHECK_ERROR(glLinkProgram(program));
MBGL_CHECK_ERROR(glGetProgramiv(program, GL_LINK_STATUS, &status));
if (status == 0) {
GLint logLength;
MBGL_CHECK_ERROR(glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength));
if (logLength > 0) {
std::unique_ptr<GLchar[]> log = mbgl::util::make_unique<GLchar[]>(logLength);
MBGL_CHECK_ERROR(glGetProgramInfoLog(program, logLength, &logLength, log.get()));
Log::Error(Event::Shader, "Program failed to link: %s", log.get());
}
MBGL_CHECK_ERROR(glDeleteShader(vertShader));
vertShader = 0;
MBGL_CHECK_ERROR(glDeleteShader(fragShader));
fragShader = 0;
MBGL_CHECK_ERROR(glDeleteProgram(program));
program = 0;
return;
}
}
}
{
// Validate program
GLint status;
MBGL_CHECK_ERROR(glValidateProgram(program));
MBGL_CHECK_ERROR(glGetProgramiv(program, GL_VALIDATE_STATUS, &status));
if (status == 0) {
GLint logLength;
MBGL_CHECK_ERROR(glGetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength));
if (logLength > 0) {
std::unique_ptr<GLchar[]> log = mbgl::util::make_unique<GLchar[]>(logLength);
MBGL_CHECK_ERROR(glGetProgramInfoLog(program, logLength, &logLength, log.get()));
Log::Error(Event::Shader, "Program failed to validate: %s", log.get());
}
MBGL_CHECK_ERROR(glDeleteShader(vertShader));
vertShader = 0;
MBGL_CHECK_ERROR(glDeleteShader(fragShader));
fragShader = 0;
MBGL_CHECK_ERROR(glDeleteProgram(program));
program = 0;
}
}
if (!skipCompile) {
// Remove the compiled shaders; they are now part of the program.
MBGL_CHECK_ERROR(glDetachShader(program, vertShader));
MBGL_CHECK_ERROR(glDeleteShader(vertShader));
MBGL_CHECK_ERROR(glDetachShader(program, fragShader));
MBGL_CHECK_ERROR(glDeleteShader(fragShader));
}
valid = true;
}
bool Shader::compileShader(GLuint *shader, GLenum type, const GLchar *source) {
GLint status;
*shader = MBGL_CHECK_ERROR(glCreateShader(type));
const GLchar *strings[] = { source };
const GLsizei lengths[] = { static_cast<GLsizei>(std::strlen(source)) };
MBGL_CHECK_ERROR(glShaderSource(*shader, 1, strings, lengths));
MBGL_CHECK_ERROR(glCompileShader(*shader));
MBGL_CHECK_ERROR(glGetShaderiv(*shader, GL_COMPILE_STATUS, &status));
if (status == 0) {
GLint logLength;
MBGL_CHECK_ERROR(glGetShaderiv(*shader, GL_INFO_LOG_LENGTH, &logLength));
if (logLength > 0) {
std::unique_ptr<GLchar[]> log = mbgl::util::make_unique<GLchar[]>(logLength);
MBGL_CHECK_ERROR(glGetShaderInfoLog(*shader, logLength, &logLength, log.get()));
Log::Error(Event::Shader, "Shader failed to compile: %s", log.get());
}
MBGL_CHECK_ERROR(glDeleteShader(*shader));
*shader = 0;
return false;
}
MBGL_CHECK_ERROR(glGetShaderiv(*shader, GL_COMPILE_STATUS, &status));
if (status == GL_FALSE) {
Log::Error(Event::Shader, "Shader %s failed to compile.", name, type);
MBGL_CHECK_ERROR(glDeleteShader(*shader));
*shader = 0;
return false;
}
return true;
}
Shader::~Shader() {
if (!binaryFileName.empty() && (gl::GetProgramBinary != nullptr)) {
// Retrieve the program binary
GLsizei binaryLength;
GLenum binaryFormat;
MBGL_CHECK_ERROR(glGetProgramiv(program, GL_PROGRAM_BINARY_LENGTH, &binaryLength));
if (binaryLength > 0) {
std::unique_ptr<char[]> binary = mbgl::util::make_unique<char[]>(binaryLength);
MBGL_CHECK_ERROR(gl::GetProgramBinary(program, binaryLength, nullptr, &binaryFormat, binary.get()));
Log::Error(Event::OpenGL, "glGetProgramBinary(%u, %u, nullptr, %u, %u)", program, binaryLength, binaryFormat, binary.get());
try {
// Write the binary to a file
std::ofstream binaryFile(binaryFileName, std::ios::out | std::ios::trunc | std::ios::binary);
binaryFile.exceptions(std::ofstream::failbit | std::ofstream::badbit | std::ofstream::eofbit);
binaryFile.write(reinterpret_cast<char *>(&binaryLength), sizeof(binaryLength));
binaryFile.write(reinterpret_cast<char *>(&binaryFormat), sizeof(binaryFormat));
binaryFile.write(binary.get(), binaryLength);
} catch(const std::exception& e) {
Log::Error(Event::Shader, "Saving binary shader failed!");
// Delete the bad file
std::remove(binaryFileName.c_str());
}
}
}
if (program) {
MBGL_CHECK_ERROR(glDeleteProgram(program));
program = 0;
valid = false;
}
}
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