REVIEWED: Data types validation

src/rmodels.c

@@ -1112,7 +1112,13 @@ Model LoadModelFromMesh(Mesh mesh)
 // Check if a model is ready
 bool IsModelReady(Model model)
 {
-    return model.meshes != NULL && model.materials != NULL && model.meshMaterial != NULL && model.meshCount > 0 && model.materialCount > 0;
+    return ((model.meshes != NULL) &&           // Validate model contains some mesh
+            (model.materials != NULL) &&        // Validate model contains some material (at least default one)
+            (model.meshMaterial != NULL) &&     // Validate mesh-material linkage
+            (model.meshCount > 0) &&            // Validate mesh count
+            (model.materialCount > 0));         // Validate material count
+            
+    // NOTE: This is a very general model validation, many elements could be validated from a model... 
 }
 
 // Unload model (meshes/materials) from memory (RAM and/or VRAM)
@@ -1959,7 +1965,8 @@ Material LoadMaterialDefault(void)
 // Check if a material is ready
 bool IsMaterialReady(Material material)
 {
-    return material.maps != NULL;
+    return ((material.maps != NULL) &&      // Validate material contain some map
+            (material.shader.id > 0));      // Validate material shader is valid
 }
 
 // Unload material from memory

src/rtext.c

@@ -538,7 +538,14 @@ Font LoadFontFromMemory(const char *fileType, const unsigned char *fileData, int
 // Check if a font is ready
 bool IsFontReady(Font font)
 {
-    return font.glyphs != NULL;
+    return ((font.texture.id > 0) &&    // Validate OpenGL id fot font texture atlas
+            (font.baseSize > 0) &&      // Validate font size
+            (font.glyphCount > 0) &&    // Validate font contains some glyph
+            (font.recs != NULL) &&      // Validate font recs defining glyphs on texture atlas
+            (font.glyphs != NULL));     // Validate glyph data is loaded
+            
+    // NOTE: Further validations could be done to verify if recs count and glyphs count 
+    // match glyphCount and to verify that data contained is valid (glyphs values, metrics...)
 }
 
 // Load font data for further use

src/rtextures.c

@@ -3362,7 +3362,9 @@ void UnloadTexture(Texture2D texture)
 // Check if a render texture is ready
 bool IsRenderTextureReady(RenderTexture2D target)
 {
-    return target.id > 0 && IsTextureReady(target.depth) && IsTextureReady(target.texture);
+    return ((target.id > 0) &&                  // Validate OpenGL id
+            IsTextureReady(target.depth) &&     // Validate FBO depth texture/renderbuffer
+            IsTextureReady(target.texture));    // Validate FBO texture 
 }
 
 // Unload render texture from GPU memory (VRAM)