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#include "Helpers.h"
#include <string>
#include <fstream>
#include <sstream>
#include <iostream>
#include <vector>
#include <png.h>
namespace Helpers
{
GLuint LoadShaders(const char * vertex_file_path, const char * fragment_file_path) {
// Create the shaders
GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);
GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
// Read the Vertex Shader code from the file
std::string VertexShaderCode;
std::ifstream VertexShaderStream(vertex_file_path, std::ios::in);
if (VertexShaderStream.is_open()) {
std::stringstream sstr;
sstr << VertexShaderStream.rdbuf();
VertexShaderCode = sstr.str();
VertexShaderStream.close();
}
else {
printf("Impossible to open %s. Are you in the right directory ? Don't forget to read the FAQ !\n", vertex_file_path);
getchar();
return 0;
}
// Read the Fragment Shader code from the file
std::string FragmentShaderCode;
std::ifstream FragmentShaderStream(fragment_file_path, std::ios::in);
if (FragmentShaderStream.is_open()) {
std::stringstream sstr;
sstr << FragmentShaderStream.rdbuf();
FragmentShaderCode = sstr.str();
FragmentShaderStream.close();
}
GLint Result = GL_FALSE;
int InfoLogLength;
// Compile Vertex Shader
printf("Compiling shader : %s\n", vertex_file_path);
char const * VertexSourcePointer = VertexShaderCode.c_str();
glShaderSource(VertexShaderID, 1, &VertexSourcePointer, NULL);
glCompileShader(VertexShaderID);
// Check Vertex Shader
glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS, &Result);
glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
if (InfoLogLength > 0) {
std::vector<char> VertexShaderErrorMessage(InfoLogLength + 1);
glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL, &VertexShaderErrorMessage[0]);
printf("%s\n", &VertexShaderErrorMessage[0]);
}
// Compile Fragment Shader
printf("Compiling shader : %s\n", fragment_file_path);
char const * FragmentSourcePointer = FragmentShaderCode.c_str();
glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer, NULL);
glCompileShader(FragmentShaderID);
// Check Fragment Shader
glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);
glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
if (InfoLogLength > 0) {
std::vector<char> FragmentShaderErrorMessage(InfoLogLength + 1);
glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL, &FragmentShaderErrorMessage[0]);
printf("%s\n", &FragmentShaderErrorMessage[0]);
}
// Link the program
printf("Linking program\n");
GLuint ProgramID = glCreateProgram();
glAttachShader(ProgramID, VertexShaderID);
glAttachShader(ProgramID, FragmentShaderID);
glLinkProgram(ProgramID);
// Check the program
glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
if (InfoLogLength > 0) {
std::vector<char> ProgramErrorMessage(InfoLogLength + 1);
glGetProgramInfoLog(ProgramID, InfoLogLength, NULL, &ProgramErrorMessage[0]);
printf("%s\n", &ProgramErrorMessage[0]);
}
glDetachShader(ProgramID, VertexShaderID);
glDetachShader(ProgramID, FragmentShaderID);
glDeleteShader(VertexShaderID);
glDeleteShader(FragmentShaderID);
return ProgramID;
}
GLuint LoadComputeShader(const char* compute_file_path)
{
GLuint ComputeShaderID = glCreateShader(GL_COMPUTE_SHADER);
// Read the compute shader
std::string ComputeShaderCode;
{
std::ifstream ComputeShaderCodeStream(compute_file_path, std::ios::in);
if (ComputeShaderCodeStream.is_open()) {
std::stringstream sstr;
sstr << ComputeShaderCodeStream.rdbuf();
ComputeShaderCode = sstr.str();
ComputeShaderCodeStream.close();
}
}
GLint Result = GL_FALSE;
int InfoLogLength;
{
// Compile Compute Shader
printf("Compiling shader : %s\n", compute_file_path);
char const * ComputeSourcePointer = ComputeShaderCode.c_str();
glShaderSource(ComputeShaderID, 1, &ComputeSourcePointer, NULL);
glCompileShader(ComputeShaderID);
// Check Compute Shader
glGetShaderiv(ComputeShaderID, GL_COMPILE_STATUS, &Result);
glGetShaderiv(ComputeShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);
if (InfoLogLength > 0) {
std::vector<char> ComputeShaderErrorMessage(InfoLogLength + 1);
glGetShaderInfoLog(ComputeShaderID, InfoLogLength, NULL, &ComputeShaderErrorMessage[0]);
printf("%s\n", &ComputeShaderErrorMessage[0]);
}
}
GLuint ProgramID = glCreateProgram();
glAttachShader(ProgramID, ComputeShaderID);
glLinkProgram(ProgramID);
// Check the program
glGetProgramiv(ProgramID, GL_LINK_STATUS, &Result);
glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);
if (InfoLogLength > 0) {
std::vector<char> ProgramErrorMessage(InfoLogLength + 1);
glGetProgramInfoLog(ProgramID, InfoLogLength, NULL, &ProgramErrorMessage[0]);
printf("%s\n", &ProgramErrorMessage[0]);
}
glDetachShader(ProgramID, ComputeShaderID);
glDeleteShader(ComputeShaderID);
return ProgramID;
}
void WriteOutputPNG(const std::vector<uint32_t>& data, unsigned int width, unsigned int height)
{
png_byte ** row_pointers = static_cast<png_byte **>(calloc(height,sizeof(void *)));
for(int i = 0; i < height ; ++i)
{
row_pointers[i] = static_cast<png_byte *>(calloc(3*width,sizeof(png_byte)));
}
uint32_t maxValue{UINT32_C(0)};
for(unsigned int i = 0; i < data.size();++i)
{
maxValue = std::max(maxValue,data[i]);
}
for(unsigned int i = 0; i < data.size();++i)
{
unsigned int row = (i)/(3*width);
unsigned int col = i - 3*row*width;
row_pointers[row][col] = (255*data[i] + (maxValue/2))/maxValue;
}
for(int i = 0; i < height/2;++i)
{
for(int j = 0; j < width;++j)
{
png_byte average = (row_pointers[i][j] + row_pointers[height-i-1][j])/2;
row_pointers[i][j] = row_pointers[height-i-1][j] = average;
}
}
ScopedCFileDescriptor fd("image.png", "wb");
if(!fd.IsValid())
{
std::cout << "Failed to open image.png for writing." << std::endl;
return;
}
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
if(!png_ptr)
{
return;
}
png_infop info_ptr = png_create_info_struct(png_ptr);
if(!info_ptr)
{
png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
return;
}
if(setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_write_struct(&png_ptr, &info_ptr);
return;
}
png_init_io(png_ptr, fd.Get());
png_set_IHDR(png_ptr, info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
png_write_info(png_ptr, info_ptr);
//header written.
png_write_image(png_ptr, row_pointers);
png_write_end(png_ptr, info_ptr);
png_destroy_write_struct(&png_ptr, &info_ptr);
for(int i = 0; i < height ; ++i)
{
free(row_pointers[i]);
}
free(row_pointers);
}
ScopedCFileDescriptor::ScopedCFileDescriptor(const char *path, const char *mode)
{
Descriptor = fopen(path,mode);
}
ScopedCFileDescriptor::~ScopedCFileDescriptor()
{
if(IsValid())
fclose(Descriptor);
}
FILE * ScopedCFileDescriptor::Get() const
{
return Descriptor;
}
bool ScopedCFileDescriptor::IsValid() const
{
return Descriptor != nullptr;
}
}
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