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/**
* @file llvertexprogramgl.cpp
* @brief LLVertexProgramGL base class
*
* Copyright (c) 2003-2007, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlife.com/developers/opensource/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlife.com/developers/opensource/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
*/
// This file contains the definition of LLVertexProgramGL,
// for purposes of running vertex programs on GL hardware.
#include "linden_common.h"
#include "llvertexprogramgl.h"
#include "llglheaders.h"
LLVertexProgramGL::LLVertexProgramGL()
{
mVertexProgramID = 0;
}
LLVertexProgramGL::~LLVertexProgramGL()
{
glDeleteProgramsARB(1, (GLuint*) &mVertexProgramID);
}
BOOL LLVertexProgramGL::load(const char * filename)
{
FILE *fp = fopen(filename, "r");
if (!fp)
{
llwarns << "Unable to open vertex program " << filename << llendl;
return FALSE;
}
fseek(fp,0,SEEK_END);
S32 file_size = ftell(fp);
fseek(fp,0,SEEK_SET);
char *text_buffer = new char[file_size + 1];
S32 num_read = (S32)fread(text_buffer, sizeof(char), file_size, fp);
if (ferror(fp) || num_read == 0)
{
llwarns << "Unable to read vertex program " << filename << llendl;
fclose(fp);
delete[] text_buffer;
return FALSE;
}
text_buffer[num_read] = '\0';
fclose(fp);
//Send program string to OpenGL
glGenProgramsARB(1, (GLuint*) &mVertexProgramID);
glBindProgramARB(GL_VERTEX_PROGRAM_ARB, mVertexProgramID);
glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB, num_read, text_buffer);
const GLubyte * program_error_string = glGetString(GL_PROGRAM_ERROR_STRING_ARB);
GLint error_pos;
glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &error_pos);
if(error_pos!=-1)
{
glGetError();
S32 line_num = 1;
char *next_token = strchr(text_buffer, '\n');
while(NULL != next_token && next_token < (text_buffer + error_pos))
{
next_token++;
line_num++;
next_token = strchr(next_token, '\n');
}
char bad_code[11];
strncpy(bad_code, text_buffer + error_pos, 10);
bad_code[10] = '\0';
llerrs << filename << "(" << line_num << "): Vertex Program Error: "
<< program_error_string << " at (" << bad_code<< ")"
<< llendl;
// clean up buffer
delete[] text_buffer;
return FALSE;
}
// clean up buffer
delete[] text_buffer;
return TRUE;
}
void LLVertexProgramGL::bind()
{
glEnable(GL_VERTEX_PROGRAM_ARB);
glBindProgramARB(GL_VERTEX_PROGRAM_ARB, mVertexProgramID);
}
void LLVertexProgramGL::unbind()
{
glDisable(GL_VERTEX_PROGRAM_ARB);
}
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