cJSON 的简单应用——保存/解析 Shader 参数 【代码示例】
【摘要】
自定义的 Shader 程序结构体：
struct ShaderProgram{ struct Path { char *vertex_shader_path; char *fragment_shader_path; } path; struct FragmentS...
自定义的 Shader 程序结构体：
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struct ShaderProgram
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{
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struct Path
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{
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char *vertex_shader_path;
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char *fragment_shader_path;
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} path;
-
-
struct FragmentShaderUniformLocation
-
{
-
char *channel_0;
-
char *channel_1;
-
char *global_time;
-
char *resolution;
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} fsul;
-
-
};
入口函数：
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int main()
-
{
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#ifdef TOFILE
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createObjects();
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#else
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parseFile("result.txt");
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#endif
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return 0;
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}
创建 (Shader Program) JSON 对象并保存为 txt 的函数：
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void createObjects()
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{
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#if MUL
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ShaderProgram sp[2] =
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{
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{
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{ "../Shader/vs_0.glsl", "../Shader/fs_0.glsl" },
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{ "iChannel0", "iChannel1", "iGlobalTime", "iResolution" }
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}, // sp[0]
-
-
{
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{ "../Shader/vs_1.glsl", "../Shader/fs_1.glsl" },
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{ "iChannel0", "iChannel1", "iGlobalTime", "iResolution" }
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} // sp[1]
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};
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#else
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ShaderProgram sp =
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{
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{ "../Shader/vs_0.glsl", "../Shader/fs_0.glsl" },
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{ "iChannel0", "iChannel1", "iGlobalTime", "iResolution" }
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};
-
-
#endif
-
-
cJSON *root = cJSON_CreateArray();
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cJSON *fld = NULL, *fldd_0 = NULL, *fldd_1;
-
-
#if MUL
-
for (int i = 0; i < 2; i++)
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{
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cJSON_AddItemToArray(root, fld = cJSON_CreateArray());
-
-
cJSON_AddItemToArray(fld, fldd_0 = cJSON_CreateObject());
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cJSON_AddStringToObject(fldd_0, "Vertex Shader Path", sp[i].path.vertex_shader_path);
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cJSON_AddStringToObject(fldd_0, "Fragment Shader Path", sp[i].path.fragment_shader_path);
-
-
cJSON_AddItemToArray(fld, fldd_1 = cJSON_CreateObject());
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cJSON_AddStringToObject(fldd_1, "Channel 0", sp[i].fsul.channel_0);
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cJSON_AddStringToObject(fldd_1, "Channel 1", sp[i].fsul.channel_1);
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cJSON_AddStringToObject(fldd_1, "Global Time", sp[i].fsul.global_time);
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cJSON_AddStringToObject(fldd_1, "Resolution", sp[i].fsul.resolution);
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}
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#else
-
-
cJSON_AddItemToArray(root, fld = cJSON_CreateArray());
-
-
cJSON_AddItemToArray(fld, fldd_0 = cJSON_CreateObject());
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cJSON_AddStringToObject(fldd_0, "Vertex Shader Path", sp.path.vertex_shader_path);
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cJSON_AddStringToObject(fldd_0, "Fragment Shader Path", sp.path.fragment_shader_path);
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cJSON_AddItemToArray(fld, fldd_1 = cJSON_CreateObject());
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cJSON_AddStringToObject(fldd_1, "Channel 0", sp.fsul.channel_0);
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cJSON_AddStringToObject(fldd_1, "Channel 1", sp.fsul.channel_1);
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cJSON_AddStringToObject(fldd_1, "Global Time", sp.fsul.global_time);
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cJSON_AddStringToObject(fldd_1, "Resolution", sp.fsul.resolution);
-
-
#endif
-
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char *out = cJSON_Print(root);
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// 保存信息到文件
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writeToFile("result.txt", out);
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printf("Debug Info: %s", out);
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free(out);
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cJSON_Delete(root);
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}
解析本地 txt 的函数：
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void parseFile(char *filename)
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{
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FILE *f;
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long len;
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char *data;
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f = fopen(filename, "rb");
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fseek(f, 0, SEEK_END);
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len = ftell(f);
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fseek(f, 0, SEEK_SET);
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data = (char *)malloc(len + 1);
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fread(data, 1, len, f);
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fclose(f);
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//easyParse(data);
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itemParse(data);
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free(data);
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}
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void itemParse(char *text)
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{
-
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cJSON *json;
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json = cJSON_Parse(text);
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if (!json)
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{
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printf("Error before: [%s]\n", cJSON_GetErrorPtr());
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}
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else
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{
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int size_0 = cJSON_GetArraySize(json);
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printf("Shader Program Nums = %d\n", size_0);
-
-
for (int i = 0; i < size_0; i++)
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{
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cJSON *pItem = cJSON_GetArrayItem(json, i);
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if (NULL == pItem)
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{
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continue;
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}
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int size_1 = cJSON_GetArraySize(pItem);
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//printf("Shader Program Item Nums = %d\n", size_1);
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printf("===========================\n");
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for (int j = 0; j < size_1; j++)
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{
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cJSON *ppItem = cJSON_GetArrayItem(pItem, j);
-
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//printJSON(ppItem);
-
-
int size_2 = cJSON_GetArraySize(ppItem);
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printf("Shader Program Item Size = %d\n", size_2);
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//printf("---------------------------\n");
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for (int k = 0; k < size_2; k++)
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{
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cJSON *pppItem = cJSON_GetArrayItem(ppItem, k);
-
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printJSON(pppItem);
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}
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printf("===========================\n");
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}
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}
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}
-
-
cJSON_Delete(json);
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}
生成的 txt 内容为：
开启 MUL 宏的情况
[
[
{
"Vertex Shader Path": "../Shader/vs_0.glsl",
"Fragment Shader Path": "../Shader/fs_0.glsl"
},
{
"Channel 0": "iChannel0",
"Channel 1": "iChannel1",
"Global Time": "iGlobalTime",
"Resolution": "iResolution"
}
],
[
{
"Vertex Shader Path": "../Shader/vs_1.glsl",
"Fragment Shader Path": "../Shader/fs_1.glsl"
},
{
"Channel 0": "iChannel0",
"Channel 1": "iChannel1",
"Global Time": "iGlobalTime",
"Resolution": "iResolution"
}
]
]
或未开启 MUL 的情况
[
[
{
"Vertex Shader Path": "../Shader/vs_0.glsl",
"Fragment Shader Path": "../Shader/fs_0.glsl"
},
{
"Channel 0": "iChannel0",
"Channel 1": "iChannel1",
"Global Time": "iGlobalTime",
"Resolution": "iResolution"
}
]
]
相关阅读
使用 CJSON 在C语言中进行 JSON 的创建和解析的实例讲解
文章来源: panda1234lee.blog.csdn.net，作者：panda1234lee，版权归原作者所有，如需转载，请联系作者。
原文链接：panda1234lee.blog.csdn.net/article/details/53312328
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