glUtility.h

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/*
 * Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
 
#ifndef __OPENGL_UTILITY_H
#define __OPENGL_UTILITY_H
 
 
#include <GL/glew.h>
#include <GL/glx.h>
 
#include <stdio.h>
#include "logging.h"
 
 
#define LOG_GL                          "[OpenGL] "
 
#define GL(x)                           { x; glCheckError( #x, __FILE__, __LINE__ ); }
 
#define GL_VERIFY(x)            { x; if(glCheckError( #x, __FILE__, __LINE__ )) return false; }
 
#define GL_VERIFYN(x)           { x; if(glCheckError( #x, __FILE__, __LINE__ )) return NULL; }
 
#define GL_CHECK(msg)           { glCheckError(msg, __FILE__, __LINE__); }
 
inline bool glCheckError(const char* msg, const char* file, int line)
{
        GLenum err = glGetError();
 
        if( err == GL_NO_ERROR )
                return false;
 
        const char* e = NULL;
 
        switch(err)
        {
                  case GL_INVALID_ENUM:          e = "invalid enum";      break;
                  case GL_INVALID_VALUE:         e = "invalid value";     break;
                  case GL_INVALID_OPERATION:     e = "invalid operation"; break;
                  case GL_STACK_OVERFLOW:        e = "stack overflow";    break;
                  case GL_STACK_UNDERFLOW:       e = "stack underflow";   break;
                  case GL_OUT_OF_MEMORY:         e = "out of memory";     break;
                #ifdef GL_TABLE_TOO_LARGE_EXT
                  case GL_TABLE_TOO_LARGE_EXT:   e = "table too large";   break;
                #endif
                #ifdef GL_TEXTURE_TOO_LARGE_EXT
                  case GL_TEXTURE_TOO_LARGE_EXT: e = "texture too large"; break;
                #endif
                  default:                                               e = "unknown error";
        }
 
        LogError(LOG_GL "Error %i - '%s'\n", (uint)err, e);
        LogError(LOG_GL "   %s::%i\n", file, line );
        LogError(LOG_GL "   %s\n", msg );
        
        return true;
}
 
 
inline bool glCheckError(const char* msg)
{
        GLenum err = glGetError();
 
        if( err == GL_NO_ERROR )
                return false;
 
        const char* e = NULL;
 
        switch(err)
        {
                  case GL_INVALID_ENUM:          e = "invalid enum";      break;
                  case GL_INVALID_VALUE:         e = "invalid value";     break;
                  case GL_INVALID_OPERATION:     e = "invalid operation"; break;
                  case GL_STACK_OVERFLOW:        e = "stack overflow";    break;
                  case GL_STACK_UNDERFLOW:       e = "stack underflow";   break;
                  case GL_OUT_OF_MEMORY:         e = "out of memory";     break;
                #ifdef GL_TABLE_TOO_LARGE_EXT
                  case GL_TABLE_TOO_LARGE_EXT:   e = "table too large";   break;
                #endif
                #ifdef GL_TEXTURE_TOO_LARGE_EXT
                  case GL_TEXTURE_TOO_LARGE_EXT: e = "texture too large"; break;
                #endif
                  default:                                               e = "unknown error";
        }
 
        LogError(LOG_GL "%s    (error %i - %s)\n", msg, (uint)err, e);
        return true;
}
 
 
inline void glPrintFreeMem()
{
        GLint total_mem_kb = 0;
        GLint cur_avail_mem_kb = 0;
 
        const GLenum GL_GPU_MEM_INFO_TOTAL_AVAILABLE_MEM_NVX = 0x9048;
        const GLenum GL_GPU_MEM_INFO_CURRENT_AVAILABLE_MEM_NVX = 0x9049;
 
        glGetIntegerv(GL_GPU_MEM_INFO_TOTAL_AVAILABLE_MEM_NVX, &total_mem_kb);
        glGetIntegerv(GL_GPU_MEM_INFO_CURRENT_AVAILABLE_MEM_NVX,&cur_avail_mem_kb);
 
        LogInfo(LOG_GL "GPU memory free    %i / %i kb\n", cur_avail_mem_kb, total_mem_kb);
}
 
 
inline void glDrawLine( float x1, float y1, float x2, float y2, float r, float g, float b, float a=1.0f, float thickness=2.0f )
{
        glLineWidth(thickness);
        glBegin(GL_LINES);
 
                glColor4f(r, g, b, a);
                
                glVertex2f(x1, y1);
                glVertex2f(x2, y2);
 
        glEnd();
}
 
 
inline void glDrawOutline( float x, float y, float width, float height, float r, float g, float b, float a=1.0f, float thickness=2.0f )
{
        const float right = x + width;
        const float bottom = y + height;
 
        glLineWidth(thickness);
        glBegin(GL_LINE_LOOP);
 
                glColor4f(r, g, b, a);
                
                glVertex2f(x, y);
                glVertex2f(right, y);
                glVertex2f(right, bottom);
                glVertex2f(x, bottom);
 
        glEnd();
}
 
 
inline void glDrawRect( float x, float y, float width, float height, float r, float g, float b, float a=1.0f )
{
        const float right = x + width;
        const float bottom = y + height;
 
        glBegin(GL_QUADS);
 
                glColor4f(r, g, b, a);
 
                glVertex2f(x, y);
                glVertex2f(right, y);   
                glVertex2f(right, bottom);
                glVertex2f(x, bottom);
 
        glEnd();
}
 
 
#endif