SENSGLTextureReader.cpp File Reference

#include "SENSGLTextureReader.h"
#include <SENS.h>
#include <Utils.h>

Include dependency graph for SENSGLTextureReader.cpp:

Go to the source code of this file.

Macros
#define	GET_GL_ERROR

Functions
std::string	glSLVersionNO ()
	Returns the OpenGL Shading Language version number as a string. More...
GLuint	buildShaderFromSource (std::string source, GLenum shaderType, bool isGlExternalTexture)

Macro Definition Documentation

GET_GL_ERROR

#define GET_GL_ERROR

Definition at line 31 of file SENSGLTextureReader.cpp.

Function Documentation

buildShaderFromSource()

GLuint buildShaderFromSource	(	std::string	source,
		GLenum	shaderType,
		bool	isGlExternalTexture
	)

Definition at line 57 of file SENSGLTextureReader.cpp.

{
    // Compile Shader code
    GLuint      shaderHandle = glCreateShader(shaderType);
    std::string version;
 
    std::string versionGLSL = glSLVersionNO();
    std::string glVersion   = std::string((const char*)glGetString(GL_VERSION));
    bool        glIsES3     = (glVersion.find("OpenGL ES 3") != string::npos);
    std::string srcVersion  = "#version " + versionGLSL;
    if (glIsES3)
        srcVersion += " es";
    srcVersion += "\n";
 
    std::string completeSrc = srcVersion + source;
 
    if (isGlExternalTexture)
    {
        Utils::replaceString(completeSrc, "#include extension", "#extension GL_OES_EGL_image_external_essl3 : enable");
        Utils::replaceString(completeSrc, "#include sampler", "uniform samplerExternalOES");
    }
    else
    {
        Utils::replaceString(completeSrc, "#include extension", "");
        Utils::replaceString(completeSrc, "#include sampler", "uniform sampler2D");
    }
 
    const char* src = completeSrc.c_str();
 
    glShaderSource(shaderHandle, 1, &src, nullptr);
    glCompileShader(shaderHandle);
 
    // Check compile success
    GLint compileSuccess;
    glGetShaderiv(shaderHandle, GL_COMPILE_STATUS, &compileSuccess);
 
    if (!compileSuccess)
    {
        GLint logSize = 0;
        glGetShaderiv(shaderHandle, GL_INFO_LOG_LENGTH, &logSize);
 
        GLchar* log = new GLchar[logSize];
 
        glGetShaderInfoLog(shaderHandle, logSize, nullptr, log);
 
        Utils::log("Application", "Cannot compile shader %s", log);
        Utils::log("Application", "%s", src);
        exit(1);
    }
    return shaderHandle;
}

glSLVersionNO()

std::string glSLVersionNO

(

)

Returns the OpenGL Shading Language version number as a string.

The string returned by glGetString can contain additional vendor information such as the build number and the brand name. For the shading language string "Nvidia GLSL 4.5" the function returns "450"

Definition at line 44 of file SENSGLTextureReader.cpp.

{
    std::string versionStr = std::string((const char*)glGetString(GL_SHADING_LANGUAGE_VERSION));
    size_t      dotPos     = versionStr.find('.');
    char        NO[4];
    NO[0] = versionStr[dotPos - 1];
    NO[1] = versionStr[dotPos + 1];
    NO[2] = '0';
    NO[3] = 0;
    return std::string(NO);
}