source: trunk/packages/vizservers/nanovis/NvShader.cpp @ 3464

Last change on this file since 3464 was 3463, checked in by ldelgass, 7 years ago

Begin process of renaming R2 library

  • Property svn:eol-style set to native
File size: 3.3 KB
Line 
1/* -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2#include <stdio.h>
3
4#include <GL/glew.h>
5#include <Cg/cg.h>
6#include <Cg/cgGL.h>
7
8#include <R2/R2FilePath.h>
9
10#include "NvShader.h"
11#include "Trace.h"
12
13using namespace nv::util;
14
15CGprofile NvShader::_defaultVertexProfile = CG_PROFILE_VP40;
16CGprofile NvShader::_defaultFragmentProfile = CG_PROFILE_FP40;
17CGcontext NvShader::_cgContext = NULL;
18
19void NvShader::initCg(CGprofile defaultVertexProfile,
20                      CGprofile defaultFragmentProfile)
21{
22    _defaultVertexProfile = defaultVertexProfile;
23    _defaultFragmentProfile = defaultFragmentProfile;
24    _cgContext = cgCreateContext();
25}
26
27void NvShader::exitCg()
28{
29    setErrorCallback(NULL);
30    printErrorInfo();
31    if (_cgContext != NULL) {
32        TRACE("Before DestroyContext");
33        cgDestroyContext(_cgContext);
34        TRACE("After DestroyContext");
35        _cgContext = NULL;
36    }
37}
38
39bool NvShader::printErrorInfo()
40{
41    CGerror lastError = cgGetError();
42
43    if (lastError) {
44        TRACE("Cg Error: %s", cgGetErrorString(lastError));
45        if (getCgContext())
46            TRACE("%s", cgGetLastListing(getCgContext()));
47        return false;
48    }
49    return true;
50}
51
52CGprogram
53NvShader::loadCgSourceProgram(CGcontext context, const char *fileName,
54                              CGprofile profile, const char *entryPoint)
55{
56    std::string path = FilePath::getInstance()->getPath(fileName);
57    if (path.empty()) {
58        ERROR("can't find program \"%s\"", fileName);
59    }
60    TRACE("cg program compiling: %s", path.c_str());
61    CGprogram program;
62    program = cgCreateProgramFromFile(context, CG_SOURCE, path.c_str(), profile, 
63                                      entryPoint, NULL);
64    cgGLLoadProgram(program);
65    CGerror LastError = cgGetError();
66    if (LastError) {
67        ERROR("Error message: %s", cgGetLastListing(context));
68    }
69    TRACE("successfully compiled program: %s", path.c_str());
70    return program;
71}
72
73NvShader::NvShader():
74    _vertexProfile(_defaultVertexProfile),
75    _fragmentProfile(_defaultFragmentProfile),
76    _cgVP(NULL),
77    _cgFP(NULL)
78{
79}
80
81NvShader::~NvShader()
82{
83    TRACE("In ~NvShader");
84    if (_cgContext == NULL) {
85        TRACE("Lost Cg context: vp: %s, fp: %s", _vpFile.c_str(), _fpFile.c_str());
86    } else {
87        resetPrograms();
88    }
89}
90
91void NvShader::loadVertexProgram(const char *fileName, const char *entryPoint)
92{
93    if (_cgVP != NULL) {
94        cgDestroyProgram(_cgVP);
95    }
96    _cgVP = loadCgSourceProgram(_cgContext, fileName,
97                                _vertexProfile, entryPoint);
98    _vpFile = fileName;
99}
100
101void NvShader::loadFragmentProgram(const char *fileName, const char *entryPoint)
102{
103    if (_cgFP != NULL) {
104        cgDestroyProgram(_cgFP);
105    }
106    _cgFP = loadCgSourceProgram(_cgContext, fileName,
107                                _fragmentProfile, entryPoint);
108    _fpFile = fileName;
109}
110
111void NvShader::resetPrograms()
112{
113    if (_cgVP != NULL) {
114        TRACE("Destroying vertex program: %s", _vpFile.c_str());
115        cgDestroyProgram(_cgVP);
116    }
117
118    if (_cgFP != NULL) {
119        TRACE("Destroying fragment program: %s", _fpFile.c_str());
120        cgDestroyProgram(_cgFP);
121    }
122}
123
124void NvShader::setErrorCallback(NvCgCallbackFunction callback)
125{
126    TRACE("NvShader setting error callback to: %p", callback);
127    cgSetErrorCallback(callback);
128}
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