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/////////////////////////////////////////////////////////////////////////////////////////////
// Copyright 2017 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");// you may not use this file except in compliance with the License.// You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software// distributed under the License is distributed on an "AS IS" BASIS,// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.// See the License for the specific language governing permissions and// limitations under the License.
/////////////////////////////////////////////////////////////////////////////////////////////
#include "GLProgram.h"
#include "CPUTOSServices.h"
#include "CPUT_OGL.h"
CGLProgram::CGLProgram()
{
}
CGLProgram::~CGLProgram()
{
glDeleteProgram(m_GLProgram);
}
GLuint CGLProgram::CreateShader(const cString &ShaderDirectory,
const std::vector<cString> &IncludeFiles,
const cString &SrcFile,
GLenum ShaderType)
{
std::vector< const char* > SrcFileData;
SrcFileData.reserve(IncludeFiles.size()+2);
#ifdef CPUT_OS_WINDOWS
SrcFileData.push_back( "#version 430\n"
"layout(row_major) uniform;\n" );
#endif
#ifdef CPUT_OS_ANDROID
SrcFileData.push_back( "#version 310 es\n" );
#endif
int i=0;
for(auto It = IncludeFiles.begin(); It != IncludeFiles.end(); ++It, ++i)
{
unsigned int FileSize;
void *pData;
CPUTResult result = CPUTFileSystem::ReadFileContents( ShaderDirectory + *It, &FileSize, &pData, true, false );
SrcFileData.push_back( (char*)pData );
}
{
unsigned int FileSize;
void *pData;
CPUTResult result = CPUTFileSystem::ReadFileContents( ShaderDirectory + SrcFile, &FileSize, &pData, true, false );
SrcFileData.push_back( (char*)pData );
}
GLuint Shader = glCreateShader(ShaderType);
GL_CHECK( glShaderSource(Shader, (GLsizei)SrcFileData.size(), &SrcFileData[0], nullptr) );
GL_CHECK( glCompileShader(Shader) );
GLint isCompiled;
GL_CHECK( glGetShaderiv(Shader, GL_COMPILE_STATUS, &isCompiled) );
if(isCompiled == false)
{
int maxLength = 0;
GL_CHECK(glGetShaderiv(Shader, GL_INFO_LOG_LENGTH, &maxLength));
// The maxLength includes the NULL character
char* infoLog = (char *)malloc(maxLength*40);
glGetShaderInfoLog(Shader, maxLength, &maxLength, infoLog);
// Handle the error in an appropriate way such as displaying a message or writing to a log file.
// In this simple program, we'll just leave
DEBUG_PRINT("Failed to compile shader:\n%s\n", infoLog);
ASSERT(false, _L("Compile frag shader failed"));
free(infoLog);
}
// The first pointer is the string with version
SrcFileData.erase(SrcFileData.begin());
for(auto It = SrcFileData.begin(); It != SrcFileData.end(); ++It)
delete[] *It;
return Shader;
}
void CGLProgram::CreateProgram(const cString &ShaderDirectory,
const std::vector<cString> &IncludeFiles,
const cString &VSSrcFile,
const cString &PSSrcFile,
const cString &CSSrcFile)
{
GLuint VS = 0, PS = 0, CS=0;
if( !VSSrcFile.empty() )
{
VS = CreateShader(ShaderDirectory, IncludeFiles, VSSrcFile, GL_VERTEX_SHADER);
}
if( !PSSrcFile.empty() )
PS = CreateShader(ShaderDirectory, IncludeFiles, PSSrcFile, GL_FRAGMENT_SHADER);
if (!CSSrcFile.empty())
CS = CreateShader(ShaderDirectory, IncludeFiles, CSSrcFile, GL_COMPUTE_SHADER);
m_GLProgram = glCreateProgram();
if (VS && PS)
{
GL_CHECK(glAttachShader(m_GLProgram, VS));
GL_CHECK(glAttachShader(m_GLProgram, PS));
}
else if( CS )
{
GL_CHECK(glAttachShader(m_GLProgram, CS));
}
GL_CHECK( glLinkProgram(m_GLProgram) );
int IsLinked;
GL_CHECK(glGetProgramiv(m_GLProgram, GL_LINK_STATUS, (int *)&IsLinked));
if( !IsLinked )
{
int maxLength;
// Noticed that glGetProgramiv is used to get the length for a shader program, not glGetShaderiv.
glGetProgramiv(m_GLProgram, GL_INFO_LOG_LENGTH, &maxLength);
// The maxLength includes the NULL character
char *shaderProgramInfoLog = (char *)malloc(maxLength);
// Notice that glGetProgramInfoLog, not glGetShaderInfoLog.
glGetProgramInfoLog(m_GLProgram, maxLength, &maxLength, shaderProgramInfoLog);
DEBUG_PRINT_ALWAYS((_L("Failed to link shader program:\n%s\n"), shaderProgramInfoLog));
ASSERT(false, _L("glLinkProgram failed"));
// Handle the error in an appropriate way such as displaying a message or writing to a log file.
// In this simple program, we'll just leave
//DEBUG_PRINT_ALWAYS(("Failed to link shader program:\n%s\n", shaderProgramInfoLog));
free(shaderProgramInfoLog);
}
if(VS)glDeleteShader(VS);
if(PS)glDeleteShader(PS);
if(CS)glDeleteShader(CS);
}