ADDED: IsShaderReady(), IsImageReady(), IsFontReady(), IsWaveReady(), IsSoundReady(), IsMusicReady() (#2892)

These IsReady() functions provide a method in order to verify whether or not the object was loaded successfully. They're useful to make sure the assets are there prior to using them.

src/raylib.h

@@ -1012,6 +1012,7 @@ RLAPI void UnloadVrStereoConfig(VrStereoConfig config);           // Unload VR s
 // NOTE: Shader functionality is not available on OpenGL 1.1
 RLAPI Shader LoadShader(const char *vsFileName, const char *fsFileName);   // Load shader from files and bind default locations
 RLAPI Shader LoadShaderFromMemory(const char *vsCode, const char *fsCode); // Load shader from code strings and bind default locations
+RLAPI bool IsShaderReady(Shader shader);                                   // Check if a shader is ready
 RLAPI int GetShaderLocation(Shader shader, const char *uniformName);       // Get shader uniform location
 RLAPI int GetShaderLocationAttrib(Shader shader, const char *attribName);  // Get shader attribute location
 RLAPI void SetShaderValue(Shader shader, int locIndex, const void *value, int uniformType);               // Set shader uniform value
@@ -1234,6 +1235,7 @@ RLAPI Image LoadImageAnim(const char *fileName, int *frames);
 RLAPI Image LoadImageFromMemory(const char *fileType, const unsigned char *fileData, int dataSize);      // Load image from memory buffer, fileType refers to extension: i.e. '.png'
 RLAPI Image LoadImageFromTexture(Texture2D texture);                                                     // Load image from GPU texture data
 RLAPI Image LoadImageFromScreen(void);                                                                   // Load image from screen buffer and (screenshot)
+RLAPI bool IsImageReady(Image image);                                                                    // Check if an image is ready
 RLAPI void UnloadImage(Image image);                                                                     // Unload image from CPU memory (RAM)
 RLAPI bool ExportImage(Image image, const char *fileName);                                               // Export image data to file, returns true on success
 RLAPI bool ExportImageAsCode(Image image, const char *fileName);                                         // Export image as code file defining an array of bytes, returns true on success
@@ -1354,6 +1356,7 @@ RLAPI Font LoadFont(const char *fileName);
 RLAPI Font LoadFontEx(const char *fileName, int fontSize, int *fontChars, int glyphCount);  // Load font from file with extended parameters, use NULL for fontChars and 0 for glyphCount to load the default character set
 RLAPI Font LoadFontFromImage(Image image, Color key, int firstChar);                        // Load font from Image (XNA style)
 RLAPI Font LoadFontFromMemory(const char *fileType, const unsigned char *fileData, int dataSize, int fontSize, int *fontChars, int glyphCount); // Load font from memory buffer, fileType refers to extension: i.e. '.ttf'
+RLAPI bool IsFontReady(Font font);                                                          // Check if a font is ready
 RLAPI GlyphInfo *LoadFontData(const unsigned char *fileData, int dataSize, int fontSize, int *fontChars, int glyphCount, int type); // Load font data for further use
 RLAPI Image GenImageFontAtlas(const GlyphInfo *chars, Rectangle **recs, int glyphCount, int fontSize, int padding, int packMethod); // Generate image font atlas using chars info
 RLAPI void UnloadFontData(GlyphInfo *chars, int glyphCount);                                // Unload font chars info data (RAM)
@@ -1513,8 +1516,10 @@ RLAPI void SetMasterVolume(float volume);                             // Set mas
 // Wave/Sound loading/unloading functions
 RLAPI Wave LoadWave(const char *fileName);                            // Load wave data from file
 RLAPI Wave LoadWaveFromMemory(const char *fileType, const unsigned char *fileData, int dataSize); // Load wave from memory buffer, fileType refers to extension: i.e. '.wav'
+RLAPI bool IsWaveReady(Wave wave);                                    // Checks if wave data is ready
 RLAPI Sound LoadSound(const char *fileName);                          // Load sound from file
 RLAPI Sound LoadSoundFromWave(Wave wave);                             // Load sound from wave data
+RLAPI bool IsSoundReady(Sound sound);                                 // Checks if a sound is ready
 RLAPI void UpdateSound(Sound sound, const void *data, int sampleCount); // Update sound buffer with new data
 RLAPI void UnloadWave(Wave wave);                                     // Unload wave data
 RLAPI void UnloadSound(Sound sound);                                  // Unload sound
@@ -1542,6 +1547,7 @@ RLAPI void UnloadWaveSamples(float *samples);                         // Unload
 // Music management functions
 RLAPI Music LoadMusicStream(const char *fileName);                    // Load music stream from file
 RLAPI Music LoadMusicStreamFromMemory(const char *fileType, const unsigned char *data, int dataSize); // Load music stream from data
+RLAPI bool IsMusicReady(Music music);                                 // Checks if a music stream is ready
 RLAPI void UnloadMusicStream(Music music);                            // Unload music stream
 RLAPI void PlayMusicStream(Music music);                              // Start music playing
 RLAPI bool IsMusicStreamPlaying(Music music);                         // Check if music is playing
@@ -1558,6 +1564,7 @@ RLAPI float GetMusicTimePlayed(Music music);                          // Get cur
 
 // AudioStream management functions
 RLAPI AudioStream LoadAudioStream(unsigned int sampleRate, unsigned int sampleSize, unsigned int channels); // Load audio stream (to stream raw audio pcm data)
+RLAPI bool IsAudioStreamReady(AudioStream stream);                    // Checks if an audio stream is ready
 RLAPI void UnloadAudioStream(AudioStream stream);                     // Unload audio stream and free memory
 RLAPI void UpdateAudioStream(AudioStream stream, const void *data, int frameCount); // Update audio stream buffers with data
 RLAPI bool IsAudioStreamProcessed(AudioStream stream);                // Check if any audio stream buffers requires refill