[SOLVED] CS代考计算机代写 // GPUProgram class

// GPUProgram class

#include “gpuProgram.h”

char* GPUProgram::textFileRead(const char *fileName)

{
char* text = “”;

if (fileName != NULL) {

FILE *file = fopen( fileName, “rt” );

if (file == NULL) {

std::cerr << “File ” << fileName << ” could not be opened” << std::endl;exit(1);} else {fseek(file, 0, SEEK_END);int count = ftell(file);rewind(file);if (count > 0) {
text = (char*)malloc(sizeof(char) * (count + 1));
count = fread(text, sizeof(char), count, file);
text[count] = ‘’;
}

fclose(file);
}
}

return _strdup(text);
}

void GPUProgram::validateShader(GLuint shader, const char* file)

{
const unsigned int BUFFER_SIZE = 512;
char buffer[BUFFER_SIZE];
memset(buffer, 0, BUFFER_SIZE);
GLsizei length = 0;

glGetShaderInfoLog(shader, BUFFER_SIZE, &length, buffer);

if (length > 0) {
std::cout << “Shader ” << shader << ” (” << (file?file:””) << “) compile log: ” << std::endl << buffer << std::endl;exit(1);}}void GPUProgram::validateProgram(){const unsigned int BUFFER_SIZE = 512;char buffer[BUFFER_SIZE];memset(buffer, 0, BUFFER_SIZE);GLsizei length = 0;memset(buffer, 0, BUFFER_SIZE);glGetProgramInfoLog(program_id, BUFFER_SIZE, &length, buffer);if (length > 0) {
std::cout << “Program ” << program_id << ” link log: ” << buffer << std::endl;exit(1);}glValidateProgram( program_id );GLint status;glGetProgramiv(program_id, GL_VALIDATE_STATUS, &status);if (status == GL_FALSE) {std::cout << “Error validating program ” << program_id << std::endl;glGetProgramInfoLog(program_id, BUFFER_SIZE, &length, buffer);if (length > 0)
std::cout << “Program ” << program_id << ” link log: ” << buffer << std::endl;exit(1);}}void GPUProgram::init( char *vsText, char *fsText ){#ifdef MACOS// On MacOS, replace “#version 300 es” with “#version 330 ” in each shaderchar *p;vsText = strdup(vsText);// in case it’s an immutable stringp = strstr( vsText, “#version 300 es” );if (p == NULL) {cerr << “No “#version 330 es” was found in vertex shader.” << endl;exit(1);}p[10] = ‘3’; p[12] = ‘
‘; p[13] = ‘
‘;p[14] = ‘
‘;fsText = strdup(fsText);// in case it’s an immutable stringp = strstr( fsText, “#version 300 es” );if (p == NULL) {cerr << “No “#version 330 es” was found in fragment shader.” << endl;exit(1);}p[10] = ‘3’; p[12] = ‘
‘; p[13] = ‘
‘;p[14] = ‘
‘;#endifglErrorReport( “before GPUProgram::init” );// Vertex shadershader_vp = glCreateShader(GL_VERTEX_SHADER);glShaderSource( shader_vp, 1, (const char**) &vsText, 0 );glCompileShader( shader_vp );validateShader( shader_vp, “vertex shader” );// Fragment shadershader_fp = glCreateShader(GL_FRAGMENT_SHADER);glShaderSource( shader_fp, 1, (const char **) &fsText, 0 );glCompileShader( shader_fp );validateShader( shader_fp, “fragment shader” );// GLSL programprogram_id = glCreateProgram();glAttachShader( program_id, shader_vp );glAttachShader( program_id, shader_fp );glLinkProgram( program_id );#ifndef MACOSvalidateProgram();#else// MacOS needs a VAO enabled before it can validate the program … why?GLuint dummy;glGenVertexArrays( 1, &dummy );glBindVertexArray( dummy );validateProgram();glBindVertexArray( 0 );glDeleteVertexArrays( 1, &dummy );#endifglUseProgram( program_id );glUseProgram( 0 );glErrorReport( “after GPUProgram::init” );#ifdef MACOSfree( vsText );free( fsText );#endif}void GPUProgram::initFromFile( const char *vsFile, const char *fsFile ) {char* vsText = textFileRead(vsFile);if (vsText == NULL) {std::cerr << “Vertex shader file ‘” << vsFile << “‘ not found.” << std::endl;return;}char* fsText = textFileRead(fsFile);if (fsText == NULL) {std::cerr << “Fragment shader file ‘” << fsFile << “‘ not found.” << std::endl;return;}// Init the shader using these stringsinit( vsText, fsText );}